Logic probe (CB10024E)

This circuit was found in documentation from the 1980s. Transistors are general-purpose types like the BC548 for NPN and the BC558 for PNP.

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Mechanical Oscillator (CB20496E)
This circuit can be used in decoration or to draw attention, in a “fake” assembly for example. What he...
550 Hz notchr filter (CB7401E)
This filter was found in Exar documentation from the 1980s. The circuit has an attenuation of 60 dB at the...
Windshield wiper timer (CB6052E)
This windshield wiper timer was obtained in an 80's Hands On. The transistor can be the BC548 and...