This circuit is from an American publication of the 80's. It makes use of components of the time. However, the circuit is the basis for a modern shield application since the input is TTL.
Two tone siren (CB9085E) This circuit was found in a 1980’s Radio Electronics. The signal must be...
This circuit switches the brightness of the LED. We found it in an English documentation....
This circuit, found in a 1989 publication, only works with incandescent lamps. The maximum power...