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Circuit symbols

The table below lists the symbols used at these pages.

Symbol Description Remarks
symbol wire Wire  
symbol crossing wire Crossing wires, no connection! Favored symbol, to aviod mix-up with joined wires.
symbol crossing wire Crossing wires, no connection!  
symbol joined wire Wires joined  
symbol resistor Constant resistor Favored symbol
symbol resistor Constant resistor Old symbol (sometimes still used in the USA)
symbol adjustable resistor Potentiometer - Adjustable resistor  
symbol resistor Connecting terminal  
symbol voltage DC voltage source The arrow points from positive to negative
symbol resistor Inductor Old symbol
symbol resistor Inductor New symbol
symbol capacitor Capacitor  
symbol capacitor Electrolytic capacitor Consider the polarity of this device
symbol switch On-Off switch  
symbol switch Push switch Push to make
symbol transistor NPN Transistor  
symbol transistor PNP Transistor  
symbol MOSFET n-channel transistor MOSFET n-channel normally conductive
ON while no voltage at gate
symbol MOSFET p-channel transistor MOSFET p-channel normally conductive
ON while no voltage at gate
symbol MOSFET n-channel transistor MOSFET n-channel normally insulated
OFF while no voltage at gate
symbol MOSFET p-channel transistor MOSFET p-channel normally insulated
OFF while no voltage at gate
symbol MOSFET p-channel transistor JFET n-channel Junction Field Effect Transistor
symbol MOSFET p-channel transistor JFET p-channel Junction Field Effect Transistor
symbol phototransistor NPN-Phototransistor Light sensitive transistor
symbol phototransistor PNP-Phototransistor Light sensitive transistor
symbol diode Diode  
symbol diode Light sensitive diode  
symbol LED light emitting diode LED - Light Emitting Diode  
symbol zener diode Zener diode Used in reverse bias to stabilize voltage.
symbol electric motor Electric motor  
symbol crystal oscillator Crystal oscillator  
symbol Amperemeter Amperemeter  
symbol Voltmeter Volmeter  
symbol Operationsverstärker Operational amplifier  
Symbol AND gate AND gate ICE 60617-12
Symbol OR gate OR gate ICE 60617-12
Symbol XOR gate XOR gate ICE 60617-12
Symbol NOT gate NOT gate ICE 60617-12
Symbol NAND gate NAND gate ICE 60617-12
Symbol NOR gate NOR gate ICE 60617-12
Symbol XNOR gate XNOR gate ICE 60617-12
Symbol gated D latch Gated D latch  
Symbol D flip-flop Positive edge triggered
D flip-flop
 
Symbol D flip-flop Negative edge triggered
D flip-flop
 
Symbol JK flip-flop Positive edge triggered
JK Flipflop
 
Symbol full adder Full adder  
Symbol relay Relay with single changeover  


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