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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Vidicon amplifier (CB9411E)
Found in American documentation from the 1970s, this circuit is intended for amplifying analog TV...
Photo Cell Amplifier (CB13097E)
Photoelectric cells can be used as sensitive light sensors. However, the low voltage they generate...
Code practice oscillator (CB8976E)
This circuit was found in a 90s American documentation. The circuit uses still common components...