This tuned circuit was found in a 1966 Electronic Circuit Handbook. The transistor can be any modern general-purpose equivalent.
This simple oscillator generates a 455 kHz signal. The circuit is from an 80's documentation and its...
This circuit was found in a 90s Popular Electronics. It is based on a Motorola double timer common at...
This circuit can be used as an answering password system in a store, office, or other location....