This 1977 circuit only allows the solenoid to energize if the right combination of switch positions is selected. The relay is 6 or 12 V depending on the low voltage supply used.
This circuit is from 1975 documentation. Transistors such as 2N3055 can be used and the...
In this circuit from the 60s, the power supply is made with 22.5 V, which is the voltage of the...
I found this simple circuit from an English magazine from 1984. The circuit can be easily...