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Electronics ckts symbols

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    Electronics ckts symbols Electronics ckts symbols Document Transcript

    • FAADOOENGINEERS.COM ELECTRONICS CKTS SYMBOLS In electronic circuits, there are many electronic symbols that are used to represent or identify a basic electronic or electrical device. They are mostly used to draw a circuit diagram and are standardized internationally by the IEEE standard (IEEE Std 315) and the British Standard (BS 3939). NO changes can be brought by the user on any electronic symbol, but the user is free to bring any changes in the architectural drawings like power source and lighting. Electronic Symbols The symbols for different electronic devices are shown below. Click on each link given below to view the symbols. Apart from the circuit symbols, each device is also designated a short name. Though these names are not approved as standard notations, they are commonly used by most people. These designations are also given in the list. Wires | Power Supplies | Resistor | Capacitor |Diode | Transistor | Logic Gates | Meters | Sensors | Switches | Audio and Radio Devices | Output Devices Wires Electronic Component Circuit Symbol Wire Description Used to connect one component to another. Wire Circuit Symbol Wires Joined One device may be connected to another through wires. This is represented by drawing “blobs” on the point where they are shorted. Wires Joined Circuit Symbol Unjoined Wires When circuits are drawn some wires may not touch others. This can only be shown by bridging them or by drawing them without blobs. But bridging is commonly practised as there will not arise any confusion. Wires Not Joined Circuit Symbol
    • FAADOOENGINEERS.COM Power Supplies Electronic Component Circuit Symbol Description Cell Used to provide a supply for a circuit. Cell Circuit Symbol Battery A battery has more than a cell and is used for the same purpose. The smaller terminal is negative and the larger one is positive. Abbreviated as ‘B’. Battery Circuit Symbol DC Supply Used as a DC power supply, that is, the current will always flow in one direction. DC Supply Circuit Symbol AC Supply Used as AC power supply, that is, the current will keep alternating directions. AC Supply Circuit Symbol Fuse Fuse Circuit Symbol Used in circuits where a probability of excessive current flows. The fuse will break the circuit if excessive current flows and saves the other devices from damage. Transformer Transformer Circuit Symbol Used as an ac power supply. Consists of two coils, the primary and secondary that are linked together through an iron core. There is no physical connection between the two coils. The principle of mutual inductance is used to obtain power. Abbreviated as ‘T’.
    • FAADOOENGINEERS.COM Earth/Ground Earth Circuit Symbol Used in electronic circuits to represent the 0 volts of the power supply. It can also be defined as the real earth , when it is applied in radio circuits and power circuits. Resistor Electronic Component Circuit Symbol Resistor Description A resistor is used to restrict the amount of current flow through a device. Abbreviated as ‘R’. Resistor Circuit Symbol Rheostat A rheostat is used to control the current flow with two contacts. Applicable in controlling lamp brightness, capacitor charge rate, etc. Rheostat Circuit Symbol Potentiometer Potentiometer Circuit Symbol Preset Preset Circuit Symbol A potentiometer is used to control the voltage flow and has three contacts. Have applications in changing a mechanical angle change to an electrical parameter. Abbreviated as ‘POT’. Presets are low cost variable resistors that are used to control the charge flow with the help of a screw driver. Applications where the resistance is determined only at the end of the circuit design. Capacitor Electronic Component Circuit Symbol Description Capacitor Circuit Symbol Capacitor is a device that is used to store electrical energy. It consists of two metals plates that are separated by a dielectric. It is applicable as a filter, that is, to block DC signals and allow AC signals. Abbreviated with Capacitor
    • FAADOOENGINEERS.COM the letter ‘C’. Capacitor Polarized Capacitor can be used in a timer circuit by adding a resistor. Capacitor-Polarised Circuit Symbol Variable Capacitor Variable Capacitor Circuit Symbol Used to vary the capacitance by turning the knob. A type of variable capacitor is the trimmer capacitor that is small in size. The notations are all the same. Diode Electronic Component Circuit Symbol Diode Description A diode is used to allow electric current to flow in only one direction. Abbreviated as ‘D’. Diode Circuit Symbol Light Emitting Diode (LED) LED is used to emit light when a current is passed through the device. It is abbreviated as LED. LED Circuit Symbol Zener Diode After a breakdown voltage, the device allows current to flow in the reverse direction as well. It is abbreviated as ‘Z’. Zener Diode Circuit Symbol Photo Diode Photodiode works as a photo-detector and converts light into its corresponding voltage or current. Photo Diode Circuit Symbol
    • FAADOOENGINEERS.COM Tunnel Diode Tunnel Diode is known for its high-speed operation due to its application in quantum mechanical effects. Tunnel Diode Circuit Symbol Schottky Diode The Schottky Diode is known for its large forward voltage drop and hence has great applications in switching circuits. Schottky Diode Circuit Symbol Transistor Electronic Component Circuit Symbol Description NPN Transistor This is a transistor with a layer of P-doped semiconductor fixed between two layers of N-doped semiconductors that act as the emitter and collector. Abbreviated as ‘Q’. Transistor NPN Circuit Symbol PNP Transistor This is a transistor with a layer of N-doped semiconductor fixed between two layers of P-doped semiconductors that act as the emitter and collector. Abbreviated as ‘Q’. Transistor PNP Circuit Symbol Phototransistor Phototransistor Circuit Symbol The working of a phototransistoris similar to that of a bipolar transistor with a difference that it converts light into its corresponding current. The phototransistor can also act as a photodiode if the emitter is not connected.
    • FAADOOENGINEERS.COM Field Effect Transistor Field Effect Transistor Circuit Symbol N-Channel Junction FET n-channel Junction Field Effect Transistor (JFET) Circuit Symbol P-Channel Junction FET Like a transistor, a FET has three terminals, the Gate, Source and Drain. The device has an electric field that controls the conductivity of a channel of one type charge carrier in a semiconductor substance. The Junction Field Effect Transistor (JFET) is the simplest type of FET with applications in Switching and voltage variable resistor. In an N-channel JFET an N-type silicon bar has two smaller pieces of P-type silicon material diffused on each sides of its middle part, forming P-N junctions. P-channel JFET is similar in construction to N-channel JFET except that P-type semiconductor base is sandwiched between two N-type junctions. In this case majority carriers are holes. p-channel Junction Field Effect Transistor (FET) Circuit Symbol Metal Oxide Semiconductor FET Given Below Abbreviated as MOSFET. MOSFET is a three terminal device and is controlled by a gate bias. It is known for its low capacitance and low input impedance. Enhancement MOSFET e-MOSFET Circuit Symbol The enhancement MOSFET structure has no channel formed during its construction. Voltage is applied to the gate, so as to develop a channel of charge carriers so that a current results when a voltage is applied across the drain-source terminals. Abbreviated as e-MOSFET. Depletion MOSFET In the depletion-mode construction a channel is physically constructed and a current between drain and source is due to voltage applied across the drain-source terminals. Abbreviated as d-MOSFET.
    • FAADOOENGINEERS.COM d-MOSFET Circuit Symbol Logic Gates Gate Standard Symbol IEC Symbol Description AND Gate AND GATE Symbol AND Gate IEC Symbol NAND Gate NAND Gate Symbol NAND Gate IEC Symbol If all the inputs of an AND gate are HIGH, then the output will also be HIGH. If any one of them is LOW, the output will also be LOW. Short form for NOT AND Gate. Of all the inputs are HIGH, the output will be LOW. If any one input is LOW, the output will be HIGH. OR Gate OR Gate Symbol OR Gate IEC Symbol If any one of the input is HIGH, the output will also be HIGH. If both inputs are LOW, the output will also be LOW. NOR Gate NOR Gate Symbol NOR Gate IEC Symbol Short form for NOT OR. If both inputs are LOW, the output will also be LOW. For other cases, the output will be HIGH.
    • FAADOOENGINEERS.COM EXOR Gate EX-OR Gate Symbol EX-OR Gate IEC Symbol EXNOR Gate EX-NOR Gate Symbol EX-NOR Gate IEC Symbol Short form for Exclusive NOR. If both inputs are either in LOW state r HIGH state, the output will be LOW. If both inputs are different, the output will be HIGH. Short form for Exclusive NOT OR. If both the inputs are the same, the output will be HIGH. If both are different, the output will also be different. NOT Gate NOT Gate Symbol NOT Gate Symbol Also known as the inverter Gate. There is only one input for this gate. If the input is HIGH, the output will be LOW. If the input is LOW, the output will be HIGH. Meters Electronic Component Circuit Symbol Description Voltmeter Voltmeter is used to measure the voltage at a certain point in the circuit. Voltmeter Circuit Symbol
    • FAADOOENGINEERS.COM Ammeter An Ammeter is used to measure the current that passes through the circuit at a particular point. Ammeter Circuit Symbol Galvanometer A galvanometer is used to measure very small currents in the order of 1 milli ampere or less. Galvanometer Circuit Symbol Ohmmeter Resistance of the circuit is measured using an Ohmmeter. Ohmmeter Circuit Symbol Oscilloscope An oscilloscope is used to measure the voltage and time period of signals along with their shape display. Oscilloscope Circuit Symbol Sensors Electronic Component Circuit Symbol Light Dependent Resistor (LDR) Description It is abbreviated as LDR. Light Dependent Resistor is used to convert light into its corresponding resistance. Instead of directly measuring the light, it senses the heat content and converts it onto resistance. LDR Circuit Symbol Thermistor Instead of directly measuring the light, a thermistor senses the heat content and converts it into resistance. Abbreviated as ‘TH’.
    • FAADOOENGINEERS.COM Thermistor Circuit Symbol Switches Electronic Component Circuit Symbol Description Push Switch This is an ordinary switch that passes current only upon pressing. Push Switch Circuit Symbol Push to Break Switch The push to break switch is usually kept in the ON state (closed). It turns to OFF state (open) only when the switch is pressed. Push to Break Switch Circuit Symbol Singe Pole Single Throw Switch Also known as the ON/OFF switch. This switch allows the flow of current only when it is kept ON. Abbreviated as SPST. On Off Switch (SPST) Circuit Symbol Single Pole Double Throw Switch 2-Way Switch (SPDT) Circuit Symbol Double Pole Single Throw Switch Also known as the 2-way switch. It can be also called as an ON/OFF/ON switch as it has an OFF position in the center. The switch causes the flow of current in two directions, depending on its position. It can be abbreviated as SPDT. Abbreviated as DPST. Can also be called as a dual ON-OFF switch. This is used to isolate between the live and neutral connections in the main electrical line. Dual On-Off Switch (DPST) Circuit Symbol
    • FAADOOENGINEERS.COM Double Pole Double Throw Switch Abbreviated as DPDT. The switch uses a central OFF position and is applied as reversing switch for motors. DPDT Circuit Symbol Relay Relay Circuit Symbol Relay is abbreviated as ‘RY’. This device can easily switch a 230 Volt AC mains circuit. It has three switching stages called Normally Open (NO). Normally Closed (NC), and Common (COM). Audio and Radio Devices Electronic Component Circuit Symbol Microphone Description This device is used for converting sound to its corresponding electrical energy. Abbreviated as ‘MIC’. Microphone Circuit Symbol Earphone Does the reverse process of microphone and converts electrical energy into sound. Earphone Circuit Symbol Loudspeaker Does the same operation as an earphone, but converts an amplified version of the electrical energy into its corresponding sound. Loudspeaker Circuit Symbol PiezoTransducer It is a transducer that converts electrical energy into sound.
    • FAADOOENGINEERS.COM PiezoTransducer Circuit Symbol Amplifier Used to amplify a signal. It is mainly used to represent a whole circuit rather than just one component. Amplifier Circuit Symbol Aerial This device is used to transmit/receive signals. Abbreviated as ‘AE’. Aerial Circuit Symbol Output Devices Electronic Component Circuit Symbol Lighting Lamp Description This is used to provide light for the output. Lamp Circuit Symbol Indicator Lamp Used to convert electrical energy into light. The best example is the warning light on a car dashboard. Lamp Indiator Circuit Symbol Heater This transducer is used to change electrical energy into heat. Heater Circuit Symbol Inductor Inductor Circuit Symbol Inductor is used to produce a magnetic field when a certain current is passed through a coil of wire. The wire is coiled on a soft iron core. Have applications in motors, and tank circuits. Abbreviated as ‘L’.
    • FAADOOENGINEERS.COM Motor This device is used to convert electrical energy into mechanical energy. Can be used as a generator as well. Abbreviated as ‘M’. Motor Circuit Symbol Bell Used to produce a sound as the output, according to the electrical energy produced as the input. Bell Circuit Symbol Buzzer It is used to produce an output sound corresponding to the electrical energy in the input. Buzzer Circuit Symbol Posted in Get Daily Updates via Email Enter your em Subscribe Latest Articles           Introduction to Microcontrollers – Programming the PIC16F84A World’s Smallest Electronic Circuit Using Nanotechnology Stealth Paint to Make Airplane Invisible Introduction to Microcontrollers – Getting Started with PIC16F84A Transformer Satellite Surgery Robot Developed to Repair Satellites Next Generation GPS Satellites LED driver IC World’s Smallest Sterling Engine Developed Using Nanotechnology LED driver circuit Categories  101-Announcements
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