This circuit delivers at its output a voltage that proportional to the amplitude of the input signal in a range of 36 dB. We found it in an American documentation from 1966.
This two-transistor amplifier can be used as power stage for intercom, experimental receivers,...
This proximity relay circuit was found in the July 1990 Radio Electronics magazine. The supply...
With an ultra-low consumption, this circuit can be powered by solar cells. The circuit is from a...