Unijunction Transistor

What is it?

The unijunction transistor is a general purpose electronic switch.

What does it do?

Using resistors and a capacitor it can be configured to operate as a simple oscillator. The frequency can be adjusted by varying the value of the resistors.

How does it work?

The unijunction transistor is a negative resistance device. The input impedance when not conducting is high. When the input voltage exceeds a peak value, it starts conducting and the input impedance is low.

Applications

Strobe light, binaural sound generator.

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