three-level touch control (CB7040E)

Found in Popular Electronics this circuit uses common components to control an incandescent lamp with three levels of intensity

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Transistor Power Amplifier (CB1400E)
Although not using transformers, this amplifier may have difficulty mounting if the original...
Base Triggered Flip Flop (CB996E)
This flip-flop or bistable multivibrator is triggered by a signal applied to the base of the...
Positive Voltage Regulator (CB5461E)
The integrated circuit used in this regulator is not very common today. The circuit is from old...