This amplifier step for small signals can use any general-purpose transistor like the BC548. The circuit can be powered by voltages from 6 to 12 V.
This circuit emits a signal in the AM range, whose modulation frequency depends on the intensity of the...
This special effect doorbell circuit was found in the January 1984 issue of Radio Electronics...
This 1997 documentation circuit was originally created for use with Camcorder type video cameras....