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Basic Circuit Schematic Symbols

There are many electronic symbols in electronic circuits that are used to represent or identify a basic electronic or electrical device. These are often used for drawing a circuit diagram and have been standardized internationally by the IEEE standard (IEEE Std 315) & the British Standard (BS 3939). NO changes can be made by the user on any electronic symbol. However, the user is given will to bring any changes in the architectural drawings like power source and lighting etc.

Symbol Component name Meaning Real world example

Wire Symbols

Basic Circuit Schematic Symbols Electrical Wire Conductor of electrical current Wire real example
Basic Circuit Schematic Symbols Connected Wires Connected crossing connected wires example
Basic Circuit Schematic Symbols Not Connected Wires Wires are not connected Not Connected Wires example

Switch symbol

Basic Circuit Schematic Symbols SPST Toggle Switch Disconnects current when open SPST Toggle Switch example
Basic Circuit Schematic Symbols SPDT Toggle Switch Selects between two connections SPDT Toggle Switch example
Basic Circuit Schematic Symbols Pushbutton Switch (N.O) Momentary switch – normally open Pushbutton Switch (N.O) example
Basic Circuit Schematic Symbols Pushbutton Switch (N.C) Momentary switch – normally closed Pushbutton Switch (N.C) example
Basic Circuit Schematic Symbols DIP Switch DIP switch is used for onboard configuration Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols SPST Relay Relay open / close connection by an electromagnet Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols SPDT Relay Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Jumper Close connection by jumper insertion on pins. Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Solder Bridge Solder to close connection Basic Circuit Schematic Symbols

Ground Symbols

Basic Circuit Schematic Symbols Earth Ground Used for zero potential reference and electrical shock protection. Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Chassis Ground Connected to the chassis of the circuit Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Digital / Common Ground Basic Circuit Schematic Symbols

Resistor Symbols

Basic Circuit Schematic Symbols Resistor (IEEE) Resistor reduces the current flow. Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Resistor (IEC) Resistor (IEC) example
Basic Circuit Schematic Symbols Potentiometer (IEEE) Adjustable resistor – has 3 terminals. Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Potentiometer (IEC) Potentiometer (IEC) example
Variable Resistor / Rheostat (IEEE) Schematic Symbols Variable Resistor / Rheostat (IEEE) Adjustable resistor – has 2 terminals. Variable Resistor / Rheostat (IEEE) example
Basic Circuit Schematic Symbols Variable Resistor / Rheostat (IEC) Variable Resistor / Rheostat (IEC) example
Trimmer Resistor Preset resistor Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Thermistor Thermal resistor – change resistance when temperature changes Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Photoresistor / Light dependent resistor (LDR) Photo-resistor – change resistance with light intensity change Basic Circuit Schematic Symbols

Capacitor Symbols

Basic Circuit Schematic Symbols Capacitor Capacitor is used to store electric charge. It acts as short circuit with AC and open circuit with DC. Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Capacitor Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Polarized Capacitor Electrolytic capacitor Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Polarized Capacitor Electrolytic capacitor
Basic Circuit Schematic Symbols Variable Capacitor Adjustable capacitance Basic Circuit Schematic Symbols

Inductor / Coil Symbols

Basic Circuit Schematic Symbols Inductor Coil / solenoid that generates magnetic field Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Iron Core Inductor Includes iron Basic Circuit Schematic Symbols
Basic Circuit Schematic Symbols Variable Inductor variable Inductor example

Power Supply Symbols

Voltage Source Basic Circuit Schematic Symbols Voltage Source Generates constant voltage Voltage Source example
Current Source Basic Circuit Schematic Symbols Current Source Generates constant current. Current Source example
AC Voltage Source Basic Circuit Schematic Symbols AC Voltage Source AC voltage source AC Voltage Source example
Generator Basic Circuit Schematic Symbols Generator Electrical voltage is generated by mechanical rotation of the generator Generator example
Battery Cell Basic Circuit Schematic Symbols Battery Cell Generates constant voltage Battery Cell example
Battery Basic Circuit Schematic Symbols Battery Generates constant voltage Battery example
Controlled Voltage Source Basic Circuit Schematic Symbols Controlled Voltage Source Generates voltage as a function of voltage or current of other circuit element. Controlled Voltage Source example
Controlled Current Source Basic Circuit Schematic Symbols Controlled Current Source Generates current as a function of voltage or current of other circuit element. Controlled Current Source example

Meter Symbols

Voltmeter Basic Circuit Schematic Symbols Voltmeter Measures voltage. Has very high resistance. Connected in parallel. Voltmeter example
Ammeter Basic Circuit Schematic Symbols Ammeter Measures electric current. Has near zero resistance. Connected serially. Ammeter example
Ohmmeter Basic Circuit Schematic Symbols Ohmmeter Measures resistance Ohmmeter example
Wattmeter Basic Circuit Schematic Symbols Wattmeter Measures electric power Wattmeter example

Lamp / Light Bulb Symbols

Lamp / light bulb Basic Circuit Schematic Symbols Lamp / light bulb Generates light when current flows through Lamp / light bulb example
Lamp / light bulb Basic Circuit Schematic Symbols Lamp / light bulb Lamp / light bulb example
Lamp / light bulb Basic Circuit Schematic Symbols Lamp / light bulb Lamp / light bulb example

Diode / LED Symbols

Diode Basic Circuit Schematic Symbols Diode Diode allows current flow in one direction only – left (anode) to right (cathode). Diode example
Zener Diode Basic Circuit Schematic Symbols Zener Diode Allows current flow in one direction, but also can flow in the reverse direction when above breakdown voltage Zener Diode example
Schottky Diode Basic Circuit Schematic Symbols Schottky Diode Schottky diode is a diode with low voltage drop Schottky Diode example
Varactor / Varicap Diode Basic Circuit Schematic Symbols Varactor / Varicap Diode Variable capacitance diode Varactor / Varicap Diode example
Tunnel Diode Basic Circuit Schematic Symbols Tunnel Diode Tunnel Diode example
Light Emitting Diode (LED)Basic Circuit Schematic Symbols Light Emitting Diode (LED) LED emits light when current flows through Light Emitting Diode (LED) example
Photodiode Basic Circuit Schematic Symbols Photodiode Photodiode allows current flow when exposed to light Photodiode example

Transistor Symbols

NPN Bipolar Transistor Basic Circuit Schematic Symbols NPN Bipolar Transistor Allows current flow when high potential at base (middle) NPN Bipolar Transistor example
PNP Bipolar Transistor Basic Circuit Schematic Symbols PNP Bipolar Transistor Allows current flow when low potential at base (middle) PNP Bipolar Transistor example
Darlington Transistor Basic Circuit Schematic Symbols Darlington Transistor Made from 2 bipolar transistors. Has total gain of the product of each gain. Darlington Transistor example
JFET-N Transistor Basic Circuit Schematic Symbols JFET-N Transistor N-channel field effect transistor JFET-N Transistor example
JFET-P Transistor Basic Circuit Schematic Symbols JFET-P Transistor P-channel field effect transistor JFET-P Transistor example
NMOS Transistor Basic Circuit Schematic Symbols NMOS Transistor N-channel MOSFET transistor NMOS Transistor example
PMOS Transistor Basic Circuit Schematic Symbols PMOS Transistor P-channel MOSFET transistor PMOS Transistor example

Misc. Symbols

Motor Basic Circuit Schematic Symbols Motor Electric motor Motor example
Transformer Basic Circuit Schematic Symbols Transformer Change AC voltage from high to low or low to high. Transformer example
Electric bell Basic Circuit Schematic Symbols Electric bell Rings when activated Electric bell example
Buzzer Basic Circuit Schematic Symbols Buzzer Produce buzzing sound Buzzer
Fuse Basic Circuit Schematic Symbols Fuse The fuse disconnects when current above threshold. Used to protect circuit from high currents. Fuse example
Fuse Basic Circuit Schematic Symbols Fuse Fuse example
Bus Basic Circuit Schematic Symbols Bus Contains several wires. Usually for data / address. Bus example
bus basic circuit schematic symbol Bus
Bus Basic Circuit Schematic Symbols Bus
Optocoupler / Opto-isolator Basic Circuit Schematic Symbols Optocoupler / Opto-isolator Optocoupler isolates connection to other board Optocoupler / Opto-isolator example
Loudspeaker Basic Circuit Schematic Symbols Loudspeaker Converts electrical signal to sound waves Loudspeaker example
Microphone Basic Circuit Schematic Symbols Microphone Converts sound waves to electrical signal Microphone example
Operational AmplifierBasic Circuit Schematic Symbols Operational Amplifier Amplify input signal Operational Amplifier example
Schmitt Trigger Basic Circuit Schematic Symbols Schmitt Trigger Operates with hysteresis to reduce noise. Schmitt Trigger example
Analog-to-digital converter (ADC) Basic Circuit Schematic Symbols Analog-to-digital converter (ADC) Converts analog signal to digital numbers Analog-to-digital converter (ADC) example
Digital-to-Analog converter (DAC) Digital-to-Analog converter (DAC) Converts digital numbers to analog signal Digital-to-Analog converter (DAC) example
Crystal Oscillator Basic Circuit Schematic Symbols Crystal Oscillator Used to generate precise frequency clock signal Crystal Oscillator example

Antenna Symbols

Antenna / aerial Basic Circuit Schematic Symbols Antenna / aerial Transmits & receives radio waves Antenna / aerial example
Antenna / aerial Basic Circuit Schematic Symbols Antenna / aerial
Dipole Antenna Basic Circuit Schematic Symbols Dipole Antenna Two wires simple antenna Dipole Antenna example

Logic Gates Symbols

NOT Gate (Inverter) Basic Circuit Schematic Symbols NOT Gate (Inverter) Outputs 1 when input is 0 NOT Gate (Inverter) example
AND Gate Basic Circuit Schematic Symbols AND Gate Outputs 1 when both inputs are 1. AND Gate example
NAND Gate Basic Circuit Schematic Symbols NAND Gate Outputs 0 when both inputs are 1. (NOT + AND) NAND Gate example
OR Gate Basic Circuit Schematic Symbols OR Gate Outputs 1 when any input is 1. OR Gate example
NOR Gate Basic Circuit Schematic Symbols NOR Gate Outputs 0 when any input is 1. (NOT + OR) NOR Gate example
XOR Gate Basic Circuit Schematic Symbols XOR Gate Outputs 1 when inputs are different. (Exclusive OR) XOR Gate example
D Flip-Flop Basic Circuit Schematic Symbols D Flip-Flop Stores one bit of data D Flip-Flop example
Multiplexer / Mux 2 to 1 Basic Circuit Schematic Symbols Multiplexer / Mux 2 to 1 Connects the output to selected input line. Multiplexer / Mux 2 to 1 example
Multiplexer / Mux 4 to 1 Basic Circuit Schematic Symbols Multiplexer / Mux 4 to 1 Multiplexer / Mux 4 to 1 example
Demultiplexer / Demux 1 to 4Basic Circuit Schematic Symbols Demultiplexer / Demux 1 to 4 Connects selected output to the input line. Demultiplexer / Demux 1 to 4 example

 

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