This circuit was found in the December 1976 issue of Radio Electronics magazine. The circuit includes a powerful pulsating siren. It is activated by courtesy light switches and other sensors.
This version of a mixer with a transistor appears elsewhere in this section and on this website. The...
This circuit, from a 1995 publication, powers incandescent lamps according to the power grid. The...
This circuit is intended for underwater communications. Of course, the critical point is the...