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 simple preamplifier was published in Radio Electronics magazine in February 1958. The battery...
The sensors in this circuit are NTCs and PTCs that work in a differential way by directly...
This interesting op-amp signal generator circuit was found in a 1977 documentation. The circuit has...