We found this circuit in the October 1970 issue of Radio Electronics magazine. It uses the then-new CA3018 integrated circuit from RCA. Some resistors are required for best performance.
This immobilizer circuit for the car was found in the Radio Electronics magazine of December 1976....
This circuit allows the activation of a remote telephone bell made with a common piezoelectric capsule. The...
This circuit can act as a receiver for the transmitter of the previous circuit. We found it in...