Windshield wiper tiner (CB9523E)

Found in old documentation, this circuit can be implemented even today with the use of a 2N2646 for the unijunction and a TIC106 for the SCR.

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Optoelectronic Detector (CB16681E)
This ultra-sensitive circuit detects the light that strikes a sensor by activating a relay. The...
XTAL 10 to 20 MHz oscillator (CB13847E)
This circuit was found in a documentation for radio amateurs in 1974. It can be used to generate...
Audio Amplifier (CB20021E)
This step of two transistors has a high input impedance due to the use of FET. We can use BF245 for...