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Inst Tools > Blog > Animation > How a Transistor Switch Works

How a Transistor Switch Works

Last updated: May 10, 2018 8:36 pm
Editorial Staff
Animation Electronic Basics
3 Comments
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Transistor as Switch Working Animation

The transistor in Figure is used as a switch to turn the LED on and off. For example, a square wave input voltage with a period of 2 s is applied to the input as indicated. When the square wave is at 0 V, the transistor is in cutoff; and since there is no collector current, the LED does not emit light. When the square wave goes to its high level, the transistor saturates. This forward-biases the LED, and the resulting collector current through the LED causes it to emit light. Thus, the LED is on for 1 second and off for 1 second.

Transistor as Switch Principle

 

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3 Comments
  • zafati mohammed says:
    December 4, 2016 at 5:39 am

    hello
    do you have any ressources to show how to select resistor and transistors for this kind of application
    thanks

    regards

    Reply
  • Ahmed says:
    June 4, 2018 at 11:18 pm

    Direction of currents uncorrect

    Reply
  • kinda says:
    April 27, 2024 at 12:22 am

    useless aplication, u could show how u can make weak source turn on tranzistor to allow more powerful source to flow

    Reply

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