This power supply uses a Raystor which is a 1964 LDR lamp coupler. The circuit was found in an Electronic Design and the transistor can be replaced with the current equivalent.
This is the receiving circuit for the transmitter given in the previous circuit. The circuit is...
Found in a 1968 Texas Instruments documentation this circuit uses an SCR from that time. Modern...
This circuit was found in a Popular Electronics from the 90s. The power source must be symmetrical...