Gated Astable Multivibrator.


An astable multivibrator can be forced to start or stop at any instant by connecting a transistor switch at the emitter terminal of one of the transistors in the astable multivibrator.This kind of circuit is called gated astable multivibrator or gated square wave oscillator.Transistor Q3 is functioning as a switch.A positive going gating pulse to the base of transistor Q3 will effectively connect the emitter of Q1 to ground and in turn , the multivibrator will function normally.In the absence of gating pulse, the transistor Q1 will be disconnected from the ground and the working of the astable multivibrator will be stopped.

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