Electronic Component Symbols

CIRCUIT SYMBOLS

Electronic Component Symbols - CIRCUIT SYMBOLS

Transistor

R0250016-06

transistor npn symbol

transistor npn

Transistors increase current. A transistor is indicated by a circle with a T inside it. The wire line bends inside the circle to touch the top of the T. An arrow points out of the circle to indicate the direction of current.

phototransistor symbol

phototransistor

A phototransistor reacts to light. Its symbol is the same as a normal transistor, plus two small arrows pointing at the circle to indicate incoming light.