This circuit was obtained from an American documentation of 1967. The circuit provides a 30 mA output current for driving standard Nixie indicator tubes at the time.
Two tone siren (CB9085E) This circuit was found in a 1980’s Radio Electronics. The signal must be...
This 1 transistor circuit is from a Radio Electronics from December 1958… The circuit is battery...
This circuit triggers producing a loud sound when a change in temperature is detected. The circuit...