3 A switched regulator (CB8859E)

Found in a 90s Popular Electronics, this circuit provides a current of 3 to 5 A depending on the transistor.

Harmonic distortion meter (CB7942E)
This 1 kHz circuit was found in American documentation from the 90s. The original operational...
Variable Oscillator 741 (CB12026E)
The circuit is from an English publication from 1978. In it we have the way to connect a 741,...
Capacitance Multiplier (CB6228E)
We found this circuit in an old Signetics documentation. The integrated circuit is of the time,...