Microcontroller controlled dimmer (CB25087E)

This circuit was found in a Radio Electronics magazine from October 1987. It can be used as a shield for incandescent and heating elements.

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Emitter triggered multivibrator (CB21456E)
Found in an American documentation from 1968, this circuit uses transistors from the time. The...
Picoammeter (CB6192E)
This circuit was found in a 1980s Intersil documentation. The integrated circuit used is not...
3 Channel Mixer (CB1288E)
This simple 3-channel passive mixer can be used with low-intensity signal sources but requires...