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A Level     Power Switching     Capacitor Phase     Diac     MOSFET     Phase     Relay     Thyristor     Thyristor AC     >Transistor<     Triac    

Power Switching Transistor


Site for Eduqas/WJEC - Go to the AQA site.

Bipolar transistors are extremely cheap.

They are ideal for low power switching as long as the necessary base current is not going to be a problem.

Bipolar Transistor Switch

Emitter Follower

Using an emitter follower greatly increases the input impedance. The output is used to drive a normal switch circuit as above.

Emitter Follower

Push Pull Amplifier

This circuit works but is rarely used. The similar MOSFET soultion is better in almost all respects.

Bipolar Transistor Push Pull Amplifier

 

 

 

 

 

 

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