Triac photo control (CB8270E)

This 1970s RCA circuit can be triggered by light or dark, depending on how the LDR is connected. The controlled load depends on the triac.

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Power Control (CB19813E)
This power control for powers up to about 10 W uses wire potentiometers in an arrangement that...
Transistor quick test (CB23769E)
This simple transistor test circuit was found in Radio Elecronics magazine from October 1961. It...
Ring Oscillator 4011 (CB24865E)
Another triggered oscillator that we found in the November 1984 Radio Electronics magazine. The...