A Level Power Switching Capacitor Phase Diac MOSFET Phase Relay Thyristor Thyristor AC >Transistor< Triac |
Power Switching Transistor |
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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.
Using an emitter follower greatly increases the input impedance. The output is used to drive a normal switch circuit as above.
This circuit works but is rarely used. The similar MOSFET soultion is better in almost all respects.
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