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 circuit is from a 1996 publication, but it can be assembled with several equivalent...
This conventional Hartley oscillator circuit with an audio output transformer was found in a...
The oscillator in the figure has its frequency determined by the crystal. The indicated value is...