Power supply (CB22270E)

This high voltage source circuit was found in an old American publication. It uses a voltage regulator valve. The circuit is suitable for tubes.

Temperature Sensitive Touch Switch (CB10236E)
This circuit was found in a 1987 edition of the United States' Hands-On Electronics magazine. The...
250V x 600 A series regulator (CB8820E)
This circuit was found in a 1966’s Delco Radio documentation. Transistors are from the era, high...
Triac LDR photo control (CB8327E)
Found in a 1960s RCA documentation, this circuit applies to most common triacs. The trigger device is a...