This document describes a circuit for testing the MT8870 DTMF receiver IC. The circuit receives DTMF tones from a telephone keypad and displays the corresponding binary values using LEDs. When a key is pressed, LED5 blinks and the other LEDs light up to indicate the binary value. This allows verifying the IC can correctly receive and decode DTMF tones.
The DRV401 is an integrated circuit designed to condition signals from closed-loop magnetic current sensors made by Vacuumschmelze GmbH & Co. KG (VAC). It provides functions like signal conditioning, an H-bridge driver for the compensation coil, and analog output proportional to primary current. The DRV401 maintains high accuracy by degaussing the sensor at power-up or on demand. It can directly drive the compensation coil or connect to external drivers. Combined with VAC sensors, the DRV401 can measure currents from small to very large.
This document describes the FT-901-M-LC02 series 155Mbps Fast Ethernet SFP transceiver. It is a multi-mode 1310nm transceiver that uses an LC connector and operates at distances up to 2km. The transceiver complies with relevant standards and has features such as hot pluggability and RoHS compliance. It provides differential LVPECL inputs/outputs and includes a signal detect indicator. Application areas include distributed multiprocessing, switch-to-switch interfaces, and storage systems. The document provides detailed specifications for the optical, electrical, and mechanical characteristics.
This document describes an FT-901-M-LC02 155Mbps Fast Ethernet SFP transceiver module. It uses a 1310nm multi-mode laser and LC connectors, and is compatible with Fast Ethernet and SONET/SDH networks. The transceiver module complies with SFP MSA specifications and supports data rates up to 155Mbps over distances of 2km using multi-mode fiber. It has an SFP form factor and includes transmitter and receiver circuitry, optical components, and electrical interfaces.
This document describes an FT-901B-M-LC02 series 155Mbps Fast Ethernet SFP transceiver that uses WDM technology to transmit at 1550nm and receive at 1310nm over multi-mode fiber with an LC connector up to 2km. It provides key specifications such as optical power levels, wavelength ranges, data rates, temperature ranges, and electrical interfaces in accordance with relevant standards. A block diagram shows the internal components and signal flows of the transceiver module.
The KX-NT700 is an IP conferencing phone that supports up to 2 external microphones and has an LCD display, keypad, and audio interfaces. It uses SIP protocol and supports codecs like G.711, G.729a, and G.722. Features include caller ID, phonebook, recording, conferencing for up to 3 points, and compatibility with Panasonic IP-PBX systems. The phone has Ethernet and analog line interfaces, a USB port, audio in/out ports, and is powered by an AC adapter or PoE.
This document describes an FT-901-M-LC30 155Mbps Fast Ethernet SFP transceiver module that uses a multi-mode 1310nm laser and LC connectors. It has a maximum reach of 30km and complies with relevant Fast Ethernet and safety standards. The document provides details on its features, applications, specifications, block diagram, and dimensions. It is a small form-factor pluggable transceiver module for Ethernet applications up to 30km.
This document describes Leonard Kibet Ng'eno's diploma project presented in September 2013 at Eldoret Polytechnic College. The project is a simple digital security system using sensing loops to detect intruders. It has a signal input block, signal decoder block, visual display unit, signal encoder block, signal amplification block, and audio output block. The circuit works off a 9V power supply and uses common components like the 4511 7-segment decoder, transistors, resistors, and a piezobuzzer.
This document provides information about the FT-901B-S-LC20 series 155Mbps Fast Ethernet SFP transceiver module. It operates at 1550nm for transmission and 1310nm for reception over single mode fiber with an LC connector and a reach of 20km. The module complies with relevant standards and has features such as hot pluggability and a TTL-level signal detect indicator. It provides optical-to-electrical conversion with differential inputs/outputs and includes a laser driver IC and post-amplification circuitry.
The DRV401 is an integrated circuit designed to condition signals from closed-loop magnetic current sensors made by Vacuumschmelze GmbH & Co. KG (VAC). It provides functions like signal conditioning, an H-bridge driver for the compensation coil, and analog output proportional to primary current. The DRV401 maintains high accuracy by degaussing the sensor at power-up or on demand. It can directly drive the compensation coil or connect to external drivers. Combined with VAC sensors, the DRV401 can measure currents from small to very large.
This document describes the FT-901-M-LC02 series 155Mbps Fast Ethernet SFP transceiver. It is a multi-mode 1310nm transceiver that uses an LC connector and operates at distances up to 2km. The transceiver complies with relevant standards and has features such as hot pluggability and RoHS compliance. It provides differential LVPECL inputs/outputs and includes a signal detect indicator. Application areas include distributed multiprocessing, switch-to-switch interfaces, and storage systems. The document provides detailed specifications for the optical, electrical, and mechanical characteristics.
This document describes an FT-901-M-LC02 155Mbps Fast Ethernet SFP transceiver module. It uses a 1310nm multi-mode laser and LC connectors, and is compatible with Fast Ethernet and SONET/SDH networks. The transceiver module complies with SFP MSA specifications and supports data rates up to 155Mbps over distances of 2km using multi-mode fiber. It has an SFP form factor and includes transmitter and receiver circuitry, optical components, and electrical interfaces.
This document describes an FT-901B-M-LC02 series 155Mbps Fast Ethernet SFP transceiver that uses WDM technology to transmit at 1550nm and receive at 1310nm over multi-mode fiber with an LC connector up to 2km. It provides key specifications such as optical power levels, wavelength ranges, data rates, temperature ranges, and electrical interfaces in accordance with relevant standards. A block diagram shows the internal components and signal flows of the transceiver module.
The KX-NT700 is an IP conferencing phone that supports up to 2 external microphones and has an LCD display, keypad, and audio interfaces. It uses SIP protocol and supports codecs like G.711, G.729a, and G.722. Features include caller ID, phonebook, recording, conferencing for up to 3 points, and compatibility with Panasonic IP-PBX systems. The phone has Ethernet and analog line interfaces, a USB port, audio in/out ports, and is powered by an AC adapter or PoE.
This document describes an FT-901-M-LC30 155Mbps Fast Ethernet SFP transceiver module that uses a multi-mode 1310nm laser and LC connectors. It has a maximum reach of 30km and complies with relevant Fast Ethernet and safety standards. The document provides details on its features, applications, specifications, block diagram, and dimensions. It is a small form-factor pluggable transceiver module for Ethernet applications up to 30km.
This document describes Leonard Kibet Ng'eno's diploma project presented in September 2013 at Eldoret Polytechnic College. The project is a simple digital security system using sensing loops to detect intruders. It has a signal input block, signal decoder block, visual display unit, signal encoder block, signal amplification block, and audio output block. The circuit works off a 9V power supply and uses common components like the 4511 7-segment decoder, transistors, resistors, and a piezobuzzer.
This document provides information about the FT-901B-S-LC20 series 155Mbps Fast Ethernet SFP transceiver module. It operates at 1550nm for transmission and 1310nm for reception over single mode fiber with an LC connector and a reach of 20km. The module complies with relevant standards and has features such as hot pluggability and a TTL-level signal detect indicator. It provides optical-to-electrical conversion with differential inputs/outputs and includes a laser driver IC and post-amplification circuitry.
This document describes the FT-901A-M-LC02 series 155Mbps Fast Ethernet SFP transceiver. It is a multi-mode transceiver that uses 1310nm lasers for transmission and 1550nm receivers for reception over LC connectors up to 2km. It complies with relevant standards and is hot-pluggable and RoHS compliant. Electrical specifications, optical specifications, and a block diagram are provided.
This document describes the FT-9001G-M-LC02 1.25G Gigabit SFP transceiver module from FELIZ Technology. The module uses a 1310nm laser and LC connectors for multi-mode fiber transmission up to 2km. It complies with standards such as IEEE 802.3z and SFP MSA and features a hot-pluggable design, TTL signal detection, and RoHS compliance. Electrical, optical, and mechanical specifications are provided along with a block diagram of the transmitter and receiver sections.
The document describes the FT-901-M-LC30 series 155Mbps Fast Ethernet SFP transceiver. It is a multi-mode 1310nm transceiver that uses an LC connector and operates at distances up to 30km. The transceiver complies with relevant Fast Ethernet and laser safety standards and uses differential LVPECL inputs/outputs with a TTL signal detect indicator. It provides optical transmission and reception per relevant telecommunications standards.
The document describes the design and components of a remote-controlled spy robot. It has two main sections: 1) the remote control section, which uses an HT12E encoder and HT12D decoder to control the robot via radio signals from a wireless remote controller. 2) The video transmission section uses a wireless CCD camera powered by a 12V battery to capture video that is transmitted to a remote receiver via radio signals. The robot can be controlled remotely to move forward, backward, left, or right using two 12V gear motors and an L293D motor driver circuit.
This document describes an FT-901B-M-LC02 series 155Mbps Fast Ethernet SFP transceiver module. It operates at 1550nm for transmission and 1310nm for reception over a multi-mode fiber with an LC connector and a reach of 2km. The transceiver module complies with relevant telecom standards and has features such as hot pluggability and a small form pluggable package. It provides electrical specifications, optical specifications, a block diagram and dimensions.
DWX Series Digital Wireless Microphone Systemsonyprousa
The DWX Series is a digital wireless microphone system from Sony that offers a wide range of microphone capsules and receiver options. It provides high-quality wireless audio transmission for applications such as live concerts, theater productions, broadcast studios, and field recordings. The system includes handheld transmitters, bodypack transmitters, lavalier microphones, rackmount and portable receivers, antennas, and accessories.
This document provides information about the FT-901B-S-LC20 series 155Mbps Fast Ethernet SFP transceiver module. It is a single-mode transceiver that transmits at 1550nm and receives at 1310nm over a single fiber with an LC connector. It has a reach of 20km and complies with relevant telecommunications standards. The document includes details on its features, specifications, optical and electrical characteristics, and dimensions.
This document provides information about audio and video products from Sonifex for radio and television broadcasters, including distribution amplifiers. It summarizes new products and updates to their 2010/11 catalog. Specifically, it describes the RB-DA6R and RB-DA6RG 6-way stereo distribution amplifiers that split an audio source to multiple outputs using RJ45 connectors according to the StudioHub+ standard, and the RB-DDA22 digital audio distribution amplifier that accepts one of five digital inputs and outputs to 22 digital outputs using various connector types.
FELIZ Technology is a professional supplier of Industrial Networking products, specialized in Industrial Ethernet connectivity. Our product lines include Media Converter, SFP Transceiver and industrial Ethernet Switch. According to certain of market research reports, the industrial Ethernet infrastructure market is about 30% annual growth since 2004. FELIZ Technology is ready to serve this growing market.
This document provides a summary of an audio amplifier's key features:
1. It has advanced DSP processing including IIR and FIR filters as well as high quality converters for smooth sound.
2. It has versatile connectivity including analog, digital, and network ports and a user interface for easy setup and control.
3. It is designed for reliability and high power output with features like efficient cooling, high voltage output, and overload protection.
The document describes an FT-901A-S-LC20 155Mbps Fast Ethernet SFP transceiver module that operates at 1310nm for transmission and 1550nm for reception over single mode fiber for distances up to 20km. It has an LC connector and complies with relevant telecom standards. The transceiver uses a laser driver chip and post-amplification circuitry to transmit and receive Fast Ethernet signals over a single fiber via a wavelength division multiplexing filter.
FSLP Presentation: Fast Source- and Load-Pull using your VNA at its full powe...NMDG NV
The document describes the NM600, a fast, simple, and low-cost solution for performing source- and load-pull measurements using a vector network analyzer. The NM600 allows a user to perform source- and load-pull measurements electronically in around 1 second per point using the VNA's internal sources and by measuring the device's DC and RF characteristics. This provides a low-cost way to characterize devices like amplifiers across different source and load impedances. The document outlines the NM600's setup, measurement concepts, and application software for controlling measurements and analyzing the collected data.
The document provides instructions for installing the BDCOM S2508B hardware switch. It includes:
- An overview of the standard configuration which includes 8 1000Mbps Ethernet RJ45 ports, 2 1000Mbps SFP ports, and 1 console port.
- Safety guidelines for installation including electrostatic discharge prevention and environmental requirements.
- Step-by-step instructions for installing the machine box on a desk or cabinet and connecting the console, SFP, and Ethernet ports.
- Procedures for checking the installation, opening/closing the machine box, upgrading memory, and analyzing hardware faults.
The document provides a data sheet for the TDA7057AQ integrated circuit, which is a 2 x 8 W stereo BTL audio output amplifier with DC volume control. Some key features and specifications of the IC include its DC volume control, thermal protection, short-circuit protection, low noise and power consumption. Testing results show it can provide up to 8W of output power with low distortion from a 12-15V supply. Graphs plot characteristics such as gain, power output, noise and supply rejection ratio versus various parameters.
This document describes a mini project involving a bus tracking system with modules placed in the bus station and central system. The bus station module announces the station name and broadcasts an encoded RF signal with the station code to a receiver in the central system module, which decodes the signal and sends the bus position information to a central computer.
This document provides information about the FT-901A-S-LC20 series 155Mbps Fast Ethernet SFP transceiver module. It operates at 1310nm for transmission and 1550nm for reception over single mode fiber with an LC connector and a reach of 20km. The transceiver complies with relevant Fast Ethernet, WDM and telecom standards and has features such as hot-pluggability and RoHS compliance. It provides optical, electrical and mechanical specifications for the transmitter and receiver components.
This document describes the design of a 16-channel audio mixer. It begins with an introduction to audio mixers and their uses. It then discusses the design methodology, considering factors like the number of input/output channels, power requirements, cost, and portability. The design is divided into several stages: a power stage using a step-down transformer and rectification circuit, a stereo stage for each channel with gain, bass, and treble controls, an auxiliary stage to boost the output signal, and a volume control stage to jointly control the levels. Block diagrams and circuit diagrams are provided to illustrate the design. In conclusion, the 16-channel audio mixer is tested by connecting it to an external amplifier and speakers.
The document describes a people counting system using infrared sensors and a microcontroller. The system uses IR LED and phototransistor pairs placed at the entrance and exit to detect movement in or out. The microcontroller increments or decrements the count displayed on a 7-segment display depending on signals from the IR sensors indicating entry or exit. The system allows monitoring visitor traffic for applications like seminar halls or museums to prevent overcrowding.
This document provides an overview of a project to develop a home automation system using Dual Tone Multi Frequency (DTMF) technology paired with wireless communication. Chapter 1 introduces DTMF technology and its use in telephone signaling. Chapter 2 discusses implementing the system using an Arduino Uno microcontroller and a DTMF decoder chip. It also describes using relays and a relay driver chip to control appliances. Chapter 3 states the problem is to allow remote control and monitoring of home appliances by cellular phone from anywhere.
This document describes a remote control circuit that allows home appliances to be turned on and off using an infrared remote control from up to 10 meters away. The circuit consists of an infrared transmitter based on a 555 timer IC and an infrared receiver module that detects the signal from the remote and uses a CD4017 IC and relay to switch the appliance. The circuit provides a low-cost solution to remotely control appliances like lamps, fans, and radios from televisions and DVD players.
The document provides information about the PDIUSBD11 USB peripheral chip from Philips Semiconductor, including its features, specifications, pin descriptions, example schematic, and considerations for bus and self-powered operation. It summarizes that the chip allows microcontrollers a USB interface using various transfer modes at full USB speed. However, its documentation and software support are lacking, making initialization difficult without additional information.
Bluetooth based home appliances controlPROJECTRONICS
This document describes a Bluetooth-based home appliance control system that allows appliances to be operated remotely using a Bluetooth-enabled device like a smartphone. The system uses a microcontroller interfaced with a Bluetooth module to receive commands from a mobile app and control electrical loads accordingly. It consists of a power supply, DTMF decoder to receive signals from Bluetooth, motor driver, solid state relays, and other circuits. The system was designed and tested successfully in the lab to allow remote control of appliances in a way that helps elderly or disabled people. Potential future expansions are also discussed.
This document describes the FT-901A-M-LC02 series 155Mbps Fast Ethernet SFP transceiver. It is a multi-mode transceiver that uses 1310nm lasers for transmission and 1550nm receivers for reception over LC connectors up to 2km. It complies with relevant standards and is hot-pluggable and RoHS compliant. Electrical specifications, optical specifications, and a block diagram are provided.
This document describes the FT-9001G-M-LC02 1.25G Gigabit SFP transceiver module from FELIZ Technology. The module uses a 1310nm laser and LC connectors for multi-mode fiber transmission up to 2km. It complies with standards such as IEEE 802.3z and SFP MSA and features a hot-pluggable design, TTL signal detection, and RoHS compliance. Electrical, optical, and mechanical specifications are provided along with a block diagram of the transmitter and receiver sections.
The document describes the FT-901-M-LC30 series 155Mbps Fast Ethernet SFP transceiver. It is a multi-mode 1310nm transceiver that uses an LC connector and operates at distances up to 30km. The transceiver complies with relevant Fast Ethernet and laser safety standards and uses differential LVPECL inputs/outputs with a TTL signal detect indicator. It provides optical transmission and reception per relevant telecommunications standards.
The document describes the design and components of a remote-controlled spy robot. It has two main sections: 1) the remote control section, which uses an HT12E encoder and HT12D decoder to control the robot via radio signals from a wireless remote controller. 2) The video transmission section uses a wireless CCD camera powered by a 12V battery to capture video that is transmitted to a remote receiver via radio signals. The robot can be controlled remotely to move forward, backward, left, or right using two 12V gear motors and an L293D motor driver circuit.
This document describes an FT-901B-M-LC02 series 155Mbps Fast Ethernet SFP transceiver module. It operates at 1550nm for transmission and 1310nm for reception over a multi-mode fiber with an LC connector and a reach of 2km. The transceiver module complies with relevant telecom standards and has features such as hot pluggability and a small form pluggable package. It provides electrical specifications, optical specifications, a block diagram and dimensions.
DWX Series Digital Wireless Microphone Systemsonyprousa
The DWX Series is a digital wireless microphone system from Sony that offers a wide range of microphone capsules and receiver options. It provides high-quality wireless audio transmission for applications such as live concerts, theater productions, broadcast studios, and field recordings. The system includes handheld transmitters, bodypack transmitters, lavalier microphones, rackmount and portable receivers, antennas, and accessories.
This document provides information about the FT-901B-S-LC20 series 155Mbps Fast Ethernet SFP transceiver module. It is a single-mode transceiver that transmits at 1550nm and receives at 1310nm over a single fiber with an LC connector. It has a reach of 20km and complies with relevant telecommunications standards. The document includes details on its features, specifications, optical and electrical characteristics, and dimensions.
This document provides information about audio and video products from Sonifex for radio and television broadcasters, including distribution amplifiers. It summarizes new products and updates to their 2010/11 catalog. Specifically, it describes the RB-DA6R and RB-DA6RG 6-way stereo distribution amplifiers that split an audio source to multiple outputs using RJ45 connectors according to the StudioHub+ standard, and the RB-DDA22 digital audio distribution amplifier that accepts one of five digital inputs and outputs to 22 digital outputs using various connector types.
FELIZ Technology is a professional supplier of Industrial Networking products, specialized in Industrial Ethernet connectivity. Our product lines include Media Converter, SFP Transceiver and industrial Ethernet Switch. According to certain of market research reports, the industrial Ethernet infrastructure market is about 30% annual growth since 2004. FELIZ Technology is ready to serve this growing market.
This document provides a summary of an audio amplifier's key features:
1. It has advanced DSP processing including IIR and FIR filters as well as high quality converters for smooth sound.
2. It has versatile connectivity including analog, digital, and network ports and a user interface for easy setup and control.
3. It is designed for reliability and high power output with features like efficient cooling, high voltage output, and overload protection.
The document describes an FT-901A-S-LC20 155Mbps Fast Ethernet SFP transceiver module that operates at 1310nm for transmission and 1550nm for reception over single mode fiber for distances up to 20km. It has an LC connector and complies with relevant telecom standards. The transceiver uses a laser driver chip and post-amplification circuitry to transmit and receive Fast Ethernet signals over a single fiber via a wavelength division multiplexing filter.
FSLP Presentation: Fast Source- and Load-Pull using your VNA at its full powe...NMDG NV
The document describes the NM600, a fast, simple, and low-cost solution for performing source- and load-pull measurements using a vector network analyzer. The NM600 allows a user to perform source- and load-pull measurements electronically in around 1 second per point using the VNA's internal sources and by measuring the device's DC and RF characteristics. This provides a low-cost way to characterize devices like amplifiers across different source and load impedances. The document outlines the NM600's setup, measurement concepts, and application software for controlling measurements and analyzing the collected data.
The document provides instructions for installing the BDCOM S2508B hardware switch. It includes:
- An overview of the standard configuration which includes 8 1000Mbps Ethernet RJ45 ports, 2 1000Mbps SFP ports, and 1 console port.
- Safety guidelines for installation including electrostatic discharge prevention and environmental requirements.
- Step-by-step instructions for installing the machine box on a desk or cabinet and connecting the console, SFP, and Ethernet ports.
- Procedures for checking the installation, opening/closing the machine box, upgrading memory, and analyzing hardware faults.
The document provides a data sheet for the TDA7057AQ integrated circuit, which is a 2 x 8 W stereo BTL audio output amplifier with DC volume control. Some key features and specifications of the IC include its DC volume control, thermal protection, short-circuit protection, low noise and power consumption. Testing results show it can provide up to 8W of output power with low distortion from a 12-15V supply. Graphs plot characteristics such as gain, power output, noise and supply rejection ratio versus various parameters.
This document describes a mini project involving a bus tracking system with modules placed in the bus station and central system. The bus station module announces the station name and broadcasts an encoded RF signal with the station code to a receiver in the central system module, which decodes the signal and sends the bus position information to a central computer.
This document provides information about the FT-901A-S-LC20 series 155Mbps Fast Ethernet SFP transceiver module. It operates at 1310nm for transmission and 1550nm for reception over single mode fiber with an LC connector and a reach of 20km. The transceiver complies with relevant Fast Ethernet, WDM and telecom standards and has features such as hot-pluggability and RoHS compliance. It provides optical, electrical and mechanical specifications for the transmitter and receiver components.
This document describes the design of a 16-channel audio mixer. It begins with an introduction to audio mixers and their uses. It then discusses the design methodology, considering factors like the number of input/output channels, power requirements, cost, and portability. The design is divided into several stages: a power stage using a step-down transformer and rectification circuit, a stereo stage for each channel with gain, bass, and treble controls, an auxiliary stage to boost the output signal, and a volume control stage to jointly control the levels. Block diagrams and circuit diagrams are provided to illustrate the design. In conclusion, the 16-channel audio mixer is tested by connecting it to an external amplifier and speakers.
The document describes a people counting system using infrared sensors and a microcontroller. The system uses IR LED and phototransistor pairs placed at the entrance and exit to detect movement in or out. The microcontroller increments or decrements the count displayed on a 7-segment display depending on signals from the IR sensors indicating entry or exit. The system allows monitoring visitor traffic for applications like seminar halls or museums to prevent overcrowding.
This document provides an overview of a project to develop a home automation system using Dual Tone Multi Frequency (DTMF) technology paired with wireless communication. Chapter 1 introduces DTMF technology and its use in telephone signaling. Chapter 2 discusses implementing the system using an Arduino Uno microcontroller and a DTMF decoder chip. It also describes using relays and a relay driver chip to control appliances. Chapter 3 states the problem is to allow remote control and monitoring of home appliances by cellular phone from anywhere.
This document describes a remote control circuit that allows home appliances to be turned on and off using an infrared remote control from up to 10 meters away. The circuit consists of an infrared transmitter based on a 555 timer IC and an infrared receiver module that detects the signal from the remote and uses a CD4017 IC and relay to switch the appliance. The circuit provides a low-cost solution to remotely control appliances like lamps, fans, and radios from televisions and DVD players.
The document provides information about the PDIUSBD11 USB peripheral chip from Philips Semiconductor, including its features, specifications, pin descriptions, example schematic, and considerations for bus and self-powered operation. It summarizes that the chip allows microcontrollers a USB interface using various transfer modes at full USB speed. However, its documentation and software support are lacking, making initialization difficult without additional information.
Bluetooth based home appliances controlPROJECTRONICS
This document describes a Bluetooth-based home appliance control system that allows appliances to be operated remotely using a Bluetooth-enabled device like a smartphone. The system uses a microcontroller interfaced with a Bluetooth module to receive commands from a mobile app and control electrical loads accordingly. It consists of a power supply, DTMF decoder to receive signals from Bluetooth, motor driver, solid state relays, and other circuits. The system was designed and tested successfully in the lab to allow remote control of appliances in a way that helps elderly or disabled people. Potential future expansions are also discussed.
Sim900 a gsm modem manual www.onlineTPS.com
Features:
Supply power: DC 9V to 12V (DC 9V typical) NOTE: Recommended power supply DC 9V/3A
Onboard Features:
1. Onboard Power ON & Network indicator LED
2. Onboard indicator LED & buzzer for incoming message & call indication
3. Onboard provision to select the power on of SIM900A (either automatic or manual) using the jumper with onboard switch for manual POWER‐ON.
4. Onboard DB9 connector for connecting modem directly to computers serial port.
5. 3 pin male header (TTL) interface for connecting SIM900 directly with microcontroller.
6. Onboard Audio (speaker and microphone) interface pins.
7. Onboard PWM and ADC channels(SIM900A PWM and ADC PINS)
DTMF based home automation without using Microcontrollerprasanth nani
This document describes a DTMF-based home automation system that allows controlling home appliances wirelessly using a mobile phone. It works by using a DTMF decoder chip to decode tones from the phone dial pad and trigger relays connected to devices. The system has advantages like wireless control and energy savings but limitations like limited number of controllable devices and lack of feedback. It finds applications in homes and industries for remote control of electrical systems.
DTMF base Mobile controlled appliances controlGopal Bardhan
This document describes a circuit that allows controlling electrical appliances via a mobile phone using DTMF tones. The circuit uses a DTMF decoder IC to decode the tones from the phone's microphone into digital outputs. These outputs control a relay circuit that can power appliances. When a key is pressed on the phone, the DTMF IC detects the tone and triggers a flip-flop that energizes the relay and the appliance. This allows remote control of devices from a phone without needing an internet connection.
This document describes a tele remote switch circuit that can remotely control up to 4 devices connected to relay outputs using a telephone's DTMF tones. The circuit uses an AT89C52 microcontroller and MT8870 DTMF decoder chip to detect and decode tones and control the relay outputs. A timer circuit is also described that can be used to set a countdown time to control for how long a connected device remains turned on.
Dtmf based home automation without micro-controllerSadiaParvinRipa
I did this project for my Digital Communication Course. It is less cost and 100% working project what I made. Without the help of Arduino and Micro-controller.
Testing and trouble shooting of multivibratorsSandeep Jamdar
The document provides information about various topics related to active testing of electronic circuits including voltage analysis, resistance analysis, and signal analysis. It describes how to perform voltage testing using a DMM, resistance testing using a multimeter to check continuity and component status, and signal analysis using an oscilloscope to observe waveforms. Troubleshooting procedures are provided for monostable multivibrators, phase shift oscillators, and clipping and clamping circuits. Transistor testing methods using a multimeter are also detailed.
This document provides information about building a digital clock circuit. It begins by explaining components like breadboards, resistors, capacitors, logic gates and integrated circuits like the 555 timer and 4029 counter that are used. It then describes how to generate a clock pulse using a 555 timer in astable mode. A 4029 counter connected to this clock is used to count the pulses in binary coded decimal format. An 7447 decoder converts the BCD output to activate the correct segments on a 7-segment LED display to display the time digitally. Wire connections and pin configurations of the integrated circuits are provided to assemble the full circuit to build a working digital clock.
This document provides instructions for assembling a motion detector kit using a PIR sensor, lens, and integrated circuit. The key components - the PIR sensor, light dependent resistor (LDR), and plastic lens - are mounted on the back of the printed circuit board. The sensitivity of the motion detection can be adjusted using three trimpots that control sensitivity level, daylight sensitivity using the LDR, and output pulse duration. The integrated circuit contains all the electronics needed for motion detection and output signaling through an LED or relay. Proper assembly of the components and warming up the circuit for a minute are important for reliable operation.
An operational amplifier (op-amp) is an integrated circuit that can amplify or compare signals. It consists of transistors, resistors, and capacitors. Op-amps are used to build amplifiers, summers, integrators, differentiators, and comparators. They obey golden rules to make the difference between their input pins zero. Op-amps are also used in analog to digital converters, which sample analog signals and convert them to digital signals for processing.
This document describes a project to control industrial/agricultural loads wirelessly using cell phones. The receiving phone decodes DTMF tones from the sending phone using a decoder chip. The output is fed to a microcontroller which controls relays and loads. A power supply regulates voltage for the microcontroller and other ICs. Relay driver chips interface the microcontroller to the relays. The project allows remote control of loads from any location using basic cell phones.
This document presents a mobile detector circuit that can detect incoming calls, texts, and video transmissions even when a mobile phone is set to silent mode. It consists of an antenna capacitor to capture RF signals, a voltage converter to convert the signals to voltages, a transistor amplifier, a timer circuit using an IC 555 chip to generate pulses, and a piezo buzzer to sound when a signal is detected. The circuit allows for detection of unauthorized mobile phone use in places like exam halls or confidential rooms, and can pick up signals from phones in silent mode. It has advantages of being low cost, easy to construct, and simple.
This document describes a mobile phone sniffer circuit that can detect mobile phone activity in restricted areas. The circuit uses a BFR96 transistor and IC1 TL071 op-amp to amplify signals from a sensor diode. The amplified signals are then fed to an IC2 LA4440 audio power amplifier to produce an audible tone from a speaker when mobile phone activity is detected within 8 meters. The circuit can be improved by using a battery power supply instead of AC to avoid interference, replacing the speaker with a buzzer, and adding a better antenna for increased range.
This PPT explains about TV Remote Operated Domestic Appliances Control.
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This circuit uses a 555 timer IC to generate noise that modulates a transistor oscillator, producing a signal that can jam cell phone frequencies between 800 MHz and 2 GHz when a simple antenna is connected. The components can be built onto the 555 IC itself using surface mount parts. The jamming range is around 10-15 feet, enough for most purposes. The current drain is high so a battery only lasts about an hour.
Timer with audible warning with circuit Diagram Team Kuk
From detectors to automobiles, audible alarms (also known to be called buzzers) have become a part of our everyday life. Some of the uses of these alarms are innocuous such as in a microwave oven. However, in some applications such as in a smoke detector or medical equipment, a person’s life may depend upon the audible warning sound. In all cases, the equipment designer should consider the desired characteristics of the audible alarm at the initial design-planning phase to obtain satisfactory performance and avoid costly redesign. The first characteristic for a designer to consider is the type of sound such as a continuous, intermittent or specialty sound. Other critical criteria include sound level, frequency, current draw, quality, mounting configuration, cost, and availability
Analog & Digital Integrated Circuits - Material (Short Answers) Mathankumar S
This document contains two-mark questions and answers related to analog and digital integrated circuits. It includes definitions and explanations of terms like virtual short, differential amplifier, slew rate, characteristics of an ideal op-amp, common mode rejection ratio, average and peak detector, linear and non-linear applications of op-amps, precision diode, hysteresis, filters, power supply rejection ratio, and more. It also provides circuit diagrams for integrator, Schmitt trigger, astable multivibrator, full wave rectifier, and instrumentation amplifier.
1) The circuit described provides a friendly charger for mobile phones that regulates voltage and current at around 5.6V and 180mA respectively to slowly charge batteries and extend their life.
2) It incorporates over-current protection and a 10 second delay after power is applied to prevent voltage spikes and protect the phone.
3) An op-amp, transistors, resistors, capacitors and zener diodes are used to regulate voltage and current, provide short-circuit protection, and indicate charging and fault status with LEDs.
This document describes the circuit design for an electronic toy modeled after a flying saucer. It has three sections: a rim flasher circuit using LEDs around the edge that flash sequentially, a dome flasher circuit with LED groups that flash at different rates, and a sound generator circuit. The circuits are built on separate PCBs and mounted in plastic bowls covered with a transparent dome to create the visual effect of a flying saucer when powered on.
This circuit generates flashing running lights using LEDs. It uses a decade counter and two astable multivibrators. The decade counter outputs activate the LEDs one by one. An astable multivibrator produces an 8.4Hz clock signal that switches the LED supply on and off, causing each LED to blink at that rate as the output shifts to the next LED every 1.3 seconds, creating a running light effect. The circuit can be built on a general-purpose PCB and works with a 12V regulated power supply.
This document describes a flashing beacon circuit that uses the LM317T regulator IC. The circuit uses a 12V DC power supply, LM317T regulator IC, 12V 10W bulb, resistors, and capacitors. The bulb flashes approximately 4 times per second as the capacitors charge and discharge. The LM317T can deliver over 1 amp of current to power the bulb. A heat sink is included to dissipate heat from the IC. Minor adjustments to the resistor and capacitor values can alter the flashing rate.
This document describes a fire alarm circuit that uses a thermistor as a heat sensor. When the thermistor's resistance decreases due to increased temperature, it provides a low-resistance path that extends positive voltage to trigger an oscillator circuit. The oscillator uses a NE555 timer IC to drive a transistor and sound an alarm through a loudspeaker. The circuit operates off a 6V-12V regulated power supply and can be easily constructed on a general-purpose PCB.
This circuit comprises an infrared (IR) transmitter unit and receiver unit that are mounted on opposite gate pillars. When the IR beam between the units is interrupted, a melody is triggered to sound for 30 seconds from the receiver unit to alert someone that someone is at the gate. The transmitter unit uses a 38kHz IR LED and timer to transmit the IR beam. The receiver unit uses an IR sensor and timer connected to a melody generator IC to detect the beam interruption and play the melody. The units are powered separately but connected to allow the receiver to trigger when the beam is blocked.
This electronic security system can monitor and alarm for multiple zones like doors and windows. It uses a monitoring circuit and closed loop sensors on each zone. When a sensor detects its zone is opened, it triggers the alarm circuit which sounds an audible alarm. The alarm continues until the triggered sensor is closed again and the reset switch is pressed. The system can monitor additional zones by expanding the monitoring circuit. It operates on battery power, making it portable for various installation locations like homes and businesses.
This circuit diagram shows an electronic horn that uses an LM3900 integrated circuit with four op-amps. Op-amp A1 generates a low-frequency square wave, op-amp A2 works as an integrator, and op-amp A3 works as a comparator to generate a wandering voltage along with op-amp A2. This wandering voltage modulates the frequency of a transistor and transformer voltage-controlled oscillator circuit comprising op-amp A4, transistor T2, and transformer X1, which produces the sound. The circuit can produce different tones by connecting the wandering voltage to different pins of the LM3900 and can be used as a car horn with a 10W audio amplifier.
This document describes an electronic bicycle lock circuit that provides an affordable anti-theft alternative for bicycle owners. The circuit uses a 9V battery, key lock switch, and tone generator integrated circuit to sound an alarm if the security loop between its two input jacks is broken. The simple circuit can be assembled on a small printed circuit board and housed in an enclosure to attach to bicycles in place of a standard lock.
This circuit diagram shows a simple electric window/fence charger circuit that uses a 12V battery, NE555 timer IC, step-down transformer, and transistors to generate high-voltage pulses. The NE555 timer IC produces narrow pulses that drive a transistor, which in turn drives another transistor connected to the transformer. This creates high-voltage pulses from the transformer that can be used to charge electric fences or window rails. Minor modifications allow it to charge over 1km of fence. Safety precautions must be taken given the high voltages generated.
This document describes a drinking water alarm circuit that notifies people when water supply resumes. It uses a simple water sensor made of aluminum and plastic foil rolls to detect water flow. When water touches the sensor, it completes a circuit that triggers a 555 timer chip configured as an astable multivibrator. The timer chip's output is connected to a loudspeaker to produce an audible alert. The circuit can be assembled on a PCB and housed in a cabinet to install the water sensor in the tap, allowing it to sound an alarm whenever the water supply starts again.
This document describes a digital stopwatch circuit built around a timer IC and 4-digit counter IC. The circuit uses one IC to generate clock pulses and another IC to count the pulses and display the time on 4 7-segment displays. It has switches to start, stop, and reset the stopwatch. When the start/stop switch is pressed, it either resets the counter to zero to start timing or latches the current count to stop timing and store the time.
The circuit functions as a digital dice using a binary counter, logic gates, and LED display. The counter cycles through counts from 0 to 6 to randomly display the six faces of a dice. The logic section uses the outputs of the 3-bit counter and logic gates like NOR, NAND to determine which of the 7 LEDs will light up to display the number. Placing a finger on the touchpad starts the oscillator and random counting to simulate rolling a dice.
This document describes a digital dice circuit using common integrated circuits. The circuit uses a NE555 timer configured as an astable oscillator to generate a 100Hz clock signal. A CD4026 or CD4033 decade counter/display driver counts the clock pulses and displays the random number on a 7-segment display. Pressing switch S1 simulates throwing the dice by extending the clock signal, while S2 resets the display to 0. The random number displayed falls between 0-6, simulating the values on a dice.
This document describes a simple desktop power supply circuit that uses a LM317T linear regulator chip to convert a 12V input from a PC power supply into a variable 1.25-9V output. The circuit allows hobbyists to easily provide adjustable voltage power for electronics projects. Key components include the LM317T regulator IC, diode D1 for polarity protection, capacitor C1 for input filtering, LED1 to indicate power, and potentiometer VR1 to variably set the output voltage which can be monitored with a digital voltmeter. The circuit can be built on a PCB and housed in a small enclosure powered from a computer's power supply.
The document describes a non-contact current sensor circuit that detects current flowing through high-wattage appliances and provides an audible alert every 15 minutes. It uses a step-down transformer as a current sensor, whose primary winding ends are connected to a full-wave bridge rectifier. The rectified output is fed to an op-amp comparator IC. When current is detected, the op-amp output triggers a 14-stage ripple counter IC to generate periodic signals that activate a buzzer through a transistor oscillator circuit, reminding the user that the appliance is still on.
This circuit provides a universal timer functionality that can be used to automatically switch electrical devices on and off after preset time intervals. The program was written in QBasic and allows the user to set the timer in increments of 10 seconds by pressing F1. Once set, pressing F2 will turn the device on and start the countdown. The timer output is connected to the computer's parallel port to control power to the device. When the display reads 0:0:0, the device will turn off. This simple, low-cost timer circuit can be used in applications like laboratories, darkrooms, and time-keeping for educational competitions.
This circuit allows up to 8 players to buzz in during a quiz competition. It uses an IC and passive components to identify the first player to press their button. The circuit is divided into a power supply section and a quiz buzzer section. The power supply generates 5V from mains power. The buzzer section uses an octal latch IC to transfer the button press signals to corresponding outputs. When a button is pressed, the corresponding bulb lights and a buzzer sounds to identify the player.
This circuit uses signals from an alarm clock to automatically turn on a TV or radio at a preset time. When the clock triggers, it sends a signal to a transistor amplifier and comparator chip. This triggers a monostable multivibrator and SCR, which energizes a relay and powers the appliance. The appliance will remain on until the power is disconnected or fails. The circuit allows automatically turning on appliances based on the time set in a standard alarm clock.
This document describes a clap switch circuit that uses two integrated circuits and a microphone to turn an appliance on or off based on detecting two claps within 3 seconds. The microphone detects claps and sends signals to timer IC1 and IC2. On the first clap, IC1 provides power to IC2 and lights an LED for the preset time. On the second clap within that time, IC2 triggers a decade counter that changes the output state to turn the appliance on or off. The circuit costs around 80 rupees to build.
1. CIRCUIT IDEAS
DTMF RECEIVER IC MT8870 TESTER S.C.
DWI
VED
I
RONE POUMAI radio communications, the tone duration The Status of LEDs on Pressing Keys
may differ due to noise considerations. on the Telephone Keypad
T
oday, most telephone equipment use Therefore, by adding an extra resistor and
a DTMF receiver IC. One common steering diode the tone duration can be Key No. LED4 LED3 LED2 LED1
DTMF receiver IC is the Motorola set to different values. (MSB) (LSB)
MT8870 that is widely used in electronic The circuit is configured in balanced-
1 Off Off Off On
communications circuits. The MT8870 is line mode. To reject common-mode noise
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an 18-pin IC. It is used in telephones and signals, a balanced differential amplifier
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a variety of other applications. When a input is used. The circuit also provides an
4 Off On Off Off
proper output is not obtained in projects excellent bridging interface across a prop-
5 Off On Off On
using this IC, engineers or technicians need erly terminated telephone line. Transient
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to test this IC separately. A quick testing protection may be achieved by splitting
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of this IC could save a lot of time in re- the input resistors and inserting zener di-
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search labs and manufacturing industries odes (ZD1 and ZD2) to achieve voltage
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of communication instruments. Here’s a clamping. This allows the transient energy
0 On Off On Off
small and handy tester circuit for the DTMF to be dissipated in the resistors and di-
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IC. It can be assembled on a multipurpose odes, and limits the maximum voltage that
B On On On Off
PCB with an 18-pin IC base. One can also may appear at the inputs.
C On On On On
test the IC on a simple breadboard. Whenever you press any key on your
D Off Off Off Off
For optimum working of telephone local telephone keypad, the delayed steer- Note. 1. LED5 blinks momentarily whenever any key is
equipment, the DTMF receiver must be ing (Std) output of the IC goes high on pressed.
designed to recognise a valid tone pair receiving the tone-pair, causing LED5 (con- 2. On = 1, while Off = 0
greater than 40 ms in duration and to ac- nected to pin 15 of IC via resistor R15) to
cept successive digit tone-pairs that are glow. It will be high for a duration de- The optional circuit shown within dot-
greater than 40 ms apart. However, for pending on the values of capacitor and ted line is used for guard time adjustment.
other applications like remote controls and resistors at pins 16 and 17. The LEDs connected via resistors R11
to R14 at pins 11
through 14, respec-
tively, indicate the
output of the IC.
The tone-pair DTMF
(dual-tone multi-fre-
quency) generated
by pressing the tele-
phone button is
converted into bi-
nary values inter-
nally in the IC. The
binary values are
indicated by glow-
ing of LEDs at the
output pins of the
IC. LED1 represents
the lowest signifi-
cant bit (LSB) and
LED4 represents the
most significant bit
(MSB).
So, when you
dial a number, say,
5, LED1 and LED3
will glow, which is
equal to 0101. Simi-
larly, for every
JUNE 2003 ELECTRONICS FOR YOU
2. CIRCUIT IDEAS
other number dialled on your telephone, switch S2 only if keys A, B, C, and D are or D), the DTMF IC 8870 is correct.
the corresponding LEDs will glow. Thus, a to be used.) Keys A, B, C, and D on the telephone
non-defective IC should indicate proper bi- 4. Now push key ‘*’ to generate DTMF keypad are used for special signalling and
nary values corresponding to the decimal tone. are not available on standard pushbutton
number pressed on your telephone key- 5. Push any decimal key from the tele- telephone keypads. Pin 5 of the IC is
pad. phone keypad. pulled down to ground through resistor
To test the DTMF IC 8870/KT3170, pro- 6. Observe the equivalent binary as R8. Switch on auxiliary switch S2. Now
ceed as follows: shown in the table. the high logic at pin 5 enables the detec-
1. Connect local telephone and the cir- 7. If the binary number implied by tion of tones representing characters A, B,
cuit in parallel to the same telephone line. glowing of LED1 to LED4 is equivalent to C, and D.
2. Switch on S1. (Switch on auxiliary the pressed key number (decimal/A, B, C, This circuit costs around Rs 80.
ELECTRONICS FOR YOU JUNE 2003