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 was found in a 1966 General Electric documentation. The circuit makes use of PUTs...
This circuit uses na Unijunction Transistor (UJT) to produce a modulation tone for several...
This circuit causes one LED to light up if the voltage falls below the value set in R3 and the...