This is the power supply circuit for the amplifier in the previous circuit. The source is adjustable and uses power transistors of the time. The AC transistor must be mounted on a heat sink.
This circuit turns on a lamp after the time set on the potentiometer. The circuit is from a Radio...
This circuit was suggested by General Electric in a 1969 documentation. The transistors are of the...
Found in a 1991 PE Hobbyst Handbook, this unit can actually supply 1.5 A with the LM317 and 3 A...