We found this circuit in a 1985 technical publication. The circuit uses PUTs to drive lamps. Relays or LEDs can be used with the voltage according to the supply.
In the figure below we have the main configurations of power supplies with the most used...
This circuit was found in the March 1982 Radio Electronics magazine. The component is a special...
This circuit can be used in measurement bridges. We found it in the September 1995 Electronics Now magazine....