This circuit for analog TV was found in a 90s EDN. The integrated circuits used are from that time and may present some difficulty in obtaining.
This circuit is temperature stabilized. Modern equivalent transistors can be used, and the power...
This circuit uses an optocoupler to obtain a solid state relay whose power depends on the Triac...
This power step for relay activation was found in the 1964 RCA transistors manual. The circuit is of the...