This circuit can be used to obtain a zener voltage from a common zener of another value, adjusting in a multimeter. The circuit is from an American documentation of the 1970s.
This dual balanced modulator configuration was obtained in a 1980s telecommunications...
Found in Linear Technology documentation from the 90's, this circuit mixes two analog video...
This voltage controlled oscillator, which can be used as a shield, generates signals in the 1.5...