This circuit is from a Motorola integrated circuit manual. The integrated used is no longer common in our market and the power transistor must be equipped with a heat sink.
We find this microphone voice effect in 1992 documentation. The vibration of the relay contacts...
This circuit for the car uses LDRs as sensors and does not need to be connected to the lamp. The...
Found in a Popular Electronics from the 90s, this circuit can be made with current equivalent...