Category: 4. Electrical Symbols

Transistor schematic symbols of electronic circuit – NPN, PNP, Darlington, JFET-N, JFET-P, NMOS, PMOS. Table of transistor symbols Symbol Name Description NPN Bipolar Transistor Allows current flow when high potential at base (middle) PNP Bipolar Transistor Allows current flow when low potential at base (middle) Darlington Transistor Made from 2 bipolar transistors. Has total gain… Continue reading Transistor Symbols

Diode schematic symbols of electronic circuit – Diode, LED, Zener diode, Schottky diode, photodiode, … Left – Anode, Right – Cathode. Symbol Name Description Diode Diode allows current flow in one direction only (left to right). Zener Diode Allows current flow in one direction, but also can flow in the reverse direction when above breakdown… Continue reading Diode Symbols

Capacitor schematic symbols – capacitor, polarized capacitor, variable capacitor. Table of capacitor symbols Symbol Name Description Capacitor Capacitor is used to store electric charge. It acts as short circuit with AC and open circuit with DC. Capacitor Polarized Capacitor Electrolytic capacitor Polarized Capacitor Electrolytic capacitor Variable Capacitor Adjustable capacitance

Resistor symbols of electrical & electronic circuit diagram – resistor, potentiometer, variable resistor. Table of resistor symbols Resistor (IEEE) Resistor reduces the current flow. Resistor (IEC) Potentiometer (IEEE) Adjustable resistor – has 3 terminals. Potentiometer (IEC) Variable Resistor / Rheostat (IEEE) Adjustable resistor – has 2 terminals. Variable Resistor / Rheostat (IEC) Trimmer Resistor Preset… Continue reading Resistor Symbols

Electrical ground symbols of circuit diagram – earth ground, chassis ground, digital ground. Symbol Name Description Earth Ground Used for zero potential reference and electrical shock protection. Chassis Ground Connected to the chassis of the circuit Digital / Common Ground

Electrical & electronic switch symbols of schematic diagram – toggle switch, pushbutton switch, DIP switch, relay, jumper, solder bridge. Symbol Name Description SPST Toggle Switch Disconnects current when open SPDT Toggle Switch Selects between two connections Pushbutton Switch (N.O) Momentary switch – normally open Pushbutton Switch (N.C) Momentary switch – normally closed DIP Switch DIP… Continue reading Electronic Switch Symbols