This circuit uses two relays that switch when the voltage exceeds the value given by zener D2. The circuit is from a Radio Electronics magazine from April 1975.
We found this circuit in a Popular Electronics of the 90s. The circuit can also be used as a seat...
This circuit was obtained in a 1965 American magazine translation. The coil is formed by 40 + 40...
In the figure we have a circuit where two 555 operating one as astable and the other as monostable...