Active three-tone filter (CB20808E)

This circuit was found in an American documentation and can be added to common amplifiers of any type. The transistor can be any general purpose.

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Instrumentation amplifier (CB7031E)
Found in Datel's documentation from the 1980s, this circuit makes use of the company's operational...
Transistorized Intercom (CB11211E)
This circuit was obtained in an old magazine from the 1970s. The circuit can still be assembled with...
PUT LED Flasher (CB16934E)
This LED signaling circuit uses a programmable unijunction transistor (PUT) as a relaxation...