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.
The basis of this project is an integrated 566 (not to be confused with a 556 which is a double...
This circuit was obtained in a 1998 publication, but it can be easily assembled. The circuit...
This game was found in an old Popular Electronics. The unijunction transistor can be 2N2646. The...