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SPICE simulation of a RC phase oscillator, this circuit with positive feedback applied, generates AC output signal without giving any input AC signal.

SPICE simulation of a Schmitt trigger implemented with two BJTs. Emitter coupled binary trigger circuit with two stable states.

SPICE simulation of a zero crossing detector circuit, device for detecting the point where the voltage crosses zero in either direction.

SPICE simulation of a full wave rectifier with capacitor as filter. The output of the rectifier is fed as input to the filter. The output of the filter is not a perfect dc, but it contains small ac components.

SPICE simulation of a full wave rectifier which converts an ac voltage into a pulsating dc voltage using both half cycles of the applied ac voltage.