This 1975 circuit for automotive applications replaces the mechanical vibrator found in old cars to produce high voltage in the supply of tube equipment.
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...