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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Infrared controlled soldering station (CB7021E)
This circuit was found in 80's Popular Electronics. The circuit uses an infrared-sensitive phototransistor...
Lamp Control (CB20533E)
This circuit, which in our times would be called a shield, can also be used with other loads. The...
6 500 Gain Amplifier (CB6642E)
Found in Philips documentation from 1968 this circuit operates at frequencies up to 10 MHz with 76...