Found in a 90s 303 Circuits, this circuit triggers a load from a 50 mV audio signal. When the signal ceases, the charge remains active for 2 seconds.
This circuit is suitable for applications in medical, research and industrial equipment. The...
Of course, the design indicates a specific application for a touch switch. Thus, analyzing the...
With this 1-transistor circuit we have a high input impedance and good gain. The circuit is from a...