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The document describes the design and performance of a low-cost function generator capable of producing square, triangular, and sine waveforms. The key objectives were to generate these waveforms with amplitude control from 4 Hz to over 1 MHz for under $50. The design uses a voltage controlled oscillator, level detector, sine shaping circuit, and variable power amplifier. Test results found it could produce the targeted waveforms from 4 Hz to 500 kHz with less than 1.2% total harmonic distortion.
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TYPES
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Ic 555
1.Introduction
The 555 IC was designed in 1971 by Hans Camenzind under contract to SigNetics Corporation.
555 timer is a highly stable circuit used to generate time delays, or Oscillations.
A single 555 timer can provide time delay ranging from microseconds to hours.
It operates from a wide range of power supplies ranging from + 5 Volts to + 18 Volts supply voltage.
2.Pin Configuration
3.Working of Pin
4.555 Integral circuit
5.Operating modes of IC
6. Bistable Mode
In bistable (also called Schmitt trigger) mode, the 555 timer acts as a basic flip-flop.
The trigger and reset inputs (pins 2 and 4 respectively on a 555) are held high via pull-up resistors while the threshold input (pin 6) is simply floating.
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Pulling the reset input to ground acts as a 'reset' and transitions the output pin to ground (low state). No timing capacitors
Pin 5 (control voltage) is connected to ground via a small-value capacitor (usually 0.01 to 0.1 μF). Pin 7 (discharge) is left floating
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Pulse generator circuit which the period is calculated from RC network and connected to external of 555 timer
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When a pulse is trigger at pin 2 (normally negative trigger pulse), timer output will change to HIGH (+Vs) for a while and change to LOW (stable condition). The condition will continue LOW until pulse is trigger again.
The timing period is triggered (started) when trigger input (555 pin 2) is less than 1/3 Vs, this makes the output high (+Vs) and the capacitor C1 starts to charge through resistor R1. Once the time period has started further trigger pulses are ignored.
The threshold input (555 pin 6) monitors the voltage across C1 and when this reaches 2/3 Vs the time period over and the output becomes LOW,
At the same time discharge (555 pin 7) is connected to 0V, discharging the capacitor ready for the next trigger.
8.Astable Mode
Astable multivibrators are also known as Free-running Multivibrator.
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PPM
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Linear Ramp generator
Precision Timing
Pulse Generation
Time Delay Generation
Sequential Timing
Used as a quad timer
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Hence 555 IC timer can produce very accurate and stable time delays, from microseconds to hours. It can be used with supply voltage varying from 5 to 18 V. Timer can be used in monostable mode of operation or astable mode of operation. Its various applications include waveform generator, missing pulse detector, frequency divider, pulse width modulator, burglar alarm, FSK generator, ramp generator, pulse position modulator etc.
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The 555 timer IC can be used to generate precise time delays from microseconds to hours. It operates from 5-18V and has 8 pins including power, ground, trigger, output, reset and control functions. It can be used in monostable or astable modes. In monostable mode, a single output pulse is produced in response to a trigger. In astable mode, it produces a continuous square wave without a trigger. The 555 timer has applications including timers, pulse generators, oscillators and more.
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1. CONTENTS :-INTRODUCTION
PIN DIAGRAM
TYPES
WORKING
2. INTRODUCTION
3. PIN DIAGRAM
4. PIN FUNCTIONING
5. CIRCUIT DIAGRAM
6. TYPES :-1) MONOSTABLE MULTIVAIBRATOR
2) ASTABLE MULTIVAIBRATOR
3) BISTABLE MULTIVAIBRATOR
7. FOMULAS
8. APPLICATIONS OF MONOSTABLE MULTIVIBRATOR
1) FREQUENCY DIVIDER
2) PULSE STRETCHER
9. APPLICATIONS OF ASTABLE MULTIVIBRATOR
1) SQUARE – WAVE OSCILLATOR
2) FREE- RUNNING RAM GENERATOR
10. THANK YOU
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1.Introduction
The 555 IC was designed in 1971 by Hans Camenzind under contract to SigNetics Corporation.
555 timer is a highly stable circuit used to generate time delays, or Oscillations.
A single 555 timer can provide time delay ranging from microseconds to hours.
It operates from a wide range of power supplies ranging from + 5 Volts to + 18 Volts supply voltage.
2.Pin Configuration
3.Working of Pin
4.555 Integral circuit
5.Operating modes of IC
6. Bistable Mode
In bistable (also called Schmitt trigger) mode, the 555 timer acts as a basic flip-flop.
The trigger and reset inputs (pins 2 and 4 respectively on a 555) are held high via pull-up resistors while the threshold input (pin 6) is simply floating.
Thus configured, pulling the trigger momentarily to ground acts as a 'set' and transitions the output pin (pin 3) to Vcc (high state).
Pulling the reset input to ground acts as a 'reset' and transitions the output pin to ground (low state). No timing capacitors
Pin 5 (control voltage) is connected to ground via a small-value capacitor (usually 0.01 to 0.1 μF). Pin 7 (discharge) is left floating
7.Monostable Mode
Pulse generator circuit which the period is calculated from RC network and connected to external of 555 timer
Stable when the output logic LOW (logic = 0)
When a pulse is trigger at pin 2 (normally negative trigger pulse), timer output will change to HIGH (+Vs) for a while and change to LOW (stable condition). The condition will continue LOW until pulse is trigger again.
The timing period is triggered (started) when trigger input (555 pin 2) is less than 1/3 Vs, this makes the output high (+Vs) and the capacitor C1 starts to charge through resistor R1. Once the time period has started further trigger pulses are ignored.
The threshold input (555 pin 6) monitors the voltage across C1 and when this reaches 2/3 Vs the time period over and the output becomes LOW,
At the same time discharge (555 pin 7) is connected to 0V, discharging the capacitor ready for the next trigger.
8.Astable Mode
Astable multivibrators are also known as Free-running Multivibrator.
Astable do not need trigger pulse for external to change the output.
The period for LOW and HIGH can be calculated based on resistor and capacitor value that connected at outside of timer.
9.Applications
Schmitt trigger
PPM
PWM
Linear Ramp generator
Precision Timing
Pulse Generation
Time Delay Generation
Sequential Timing
Used as a quad timer
10. Conclusion
Hence 555 IC timer can produce very accurate and stable time delays, from microseconds to hours. It can be used with supply voltage varying from 5 to 18 V. Timer can be used in monostable mode of operation or astable mode of operation. Its various applications include waveform generator, missing pulse detector, frequency divider, pulse width modulator, burglar alarm, FSK generator, ramp generator, pulse position modulator etc.
555 timer ppt by vishnu
The 555 timer IC can be used to generate precise time delays from microseconds to hours. It operates from 5-18V and has 8 pins including power, ground, trigger, output, reset and control functions. It can be used in monostable or astable modes. In monostable mode, a single output pulse is produced in response to a trigger. In astable mode, it produces a continuous square wave without a trigger. The 555 timer has applications including timers, pulse generators, oscillators and more.
Astable multivibrator
PowerPoint Presentation on using IC 555 Timer as an Astable Multi vibrator. Working of the astable multi vibrator, advantages and disadvantages of an Astable Multi-vibrator,Input and Output Pins of 555 IC, Formulae for calculating the charge and discharge time and cycle time of the astable multi vibrator.
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design and analysis of voltage controlled oscillator
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oscillator presentation ucet
The document discusses different types of oscillators:
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Sinusoidal oscillators
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Unit 2 signal generators
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A simulator to reproduce fast rise-up noises which are generated when switching ON / OFF electric current on the inductive load.
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PPT.pdf
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This document summarizes a student presentation on function generators. It discusses that function generators can produce sine, square, triangular, ramp and pulse waveforms over a wide frequency range. It describes analog and digital function generators and how they work using digital to analog conversion, filtering and waveform generation integrated circuits controlled by a microcontroller. It provides details on specifications like waveform distortion levels, modulation, output amplitude and impedance. Function generator working is explained as using a capacitor charged and discharged by a current source to generate triangle waves which can then be shaped into other waveforms.
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Monitoring and Managing Anomaly Detection on OpenShift.pdf
leewayhertz.com-AI in predictive maintenance Use cases technologies benefits ...
leewayhertz.com-AI in predictive maintenance Use cases technologies benefits ...
sistec ppt
- 1. Prepared by ANURODH KUMAR A.P(EC) Sistec-E Bhopal SISTEC-E
- 2. ◦ Function Generators can produce Square, Triangular and Sinusoidal waveforms over a wide range of frequencies and amplitudes as well as modulated waveforms (AM, FM, FSK) and signal noise. Why a Function Generator? ◦ Essential tool in Electrical Engineering ◦ Can be implemented with basic inexpensive components ◦ Most circuits needed have a direct relevance to the course Project Objectives ◦ To build a low-cost Function Generator capable of: Producing Square, Triangular and Sine waveforms with amplitude control adjusting the waveform frequencies up to 1 MHz or higher The function generator should be low cost SISTEC-E
- 3. In this Presentation we will talk about: ◦ The Design ◦ Performance & Results ◦ Advantages & Disadvantages (Conclusion) SISTEC-E
- 4. Block Diagram ◦ Voltage Controlled Oscillator (VCO) ◦ Level Detector ◦ Sine Shaping Circuit ◦ Output stage (Variable Power Amplifier) Voltage Controlled Oscillator Level Detector Sine Shaping Circuit Amplifier Stage Voltage Controlled Oscillator Level Detector Sine Shaping Circuit Amplifier Stage SISTEC-E
- 5. Wien Bridge Sine Oscillator Compensated Triangle Oscillator Using LM6365 Triangle Oscillator with double Detector Circuit Crystal Oscillator Voltage Controlled Oscillator Level Detector Sine Shaping Circuit Amplifier Stage Simplified Triangle Oscillator with single voltage detector (Final VCO based on this circuit) SISTEC-E
- 6. Voltage Controlled Oscillator Level Detector Sine Shaping Circuit Amplifier Stage Wien Bridge Sine Oscillator Compensated Triangle Oscillator Using LM6365 Triangle Oscillator with double Detector Circuit Crystal Oscillator Simplified Triangle Oscillator with single voltage detector Final Selection SISTEC-E
- 7. Voltage Controlled Oscillator Level Detector Sine Shaping Circuit Amplifier Stage Overdriven CA3080 Breakpoint Sine Shaper BJT non-linear amplifier SISTEC-E
- 8. Voltage Controlled Oscillator Level Detector Sine Shaping Circuit Amplifier Stage Variable Inverting Amplifier with Offset Adjustment SISTEC-E
- 9. Waveforms Produced ◦ Triangular, Square and Sinusoidal Overall Frequency Range: 4 Hz – 1.3 MHz Practical Frequency Range: ◦ Triangle: 4 Hz to 500 kHz ◦ Square: 4 Hz to 1.3 MHz & up ◦ Sine: 30 kHz to 1.3 MHz & up (independent) ◦ Sine: 30 kHz to 500 kHz (dependent) SISTEC-E
- 10. Duty Cycle Adjustment: 1% - 80% Amplitude Control: 0 V – 26 V p-p DC Offset Control: 0V - +/- 5 V THD of Sinewave: ◦ 0.768 % at 500 kHz, 50% D.C. ◦ 0.878 % at 10 kHz, 50% D.C. ◦ 1.155 % at 1.0 MHz, 50% D.C. SISTEC-E
- 11. SISTEC-E