This circuit is a monostable multivibrator, or one-shot. Press the switch, and the collector of Q1 will briefly go high (1.7 V), and then it will go low again (near ground). This circuit is similar to the astable multivibrator, except that one of the capacitors has been removed, so the oscillator stops after half a cycle.
This page is a utility for simulating моностабильный мультивибатор (one-shot) online with specified initial values.









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