This circuit was found in a 1970s General Electric documentation. This circuit already used an emitting LED. The circuit operates at frequencies from 50 Hz to 50 kHz with short pulses
This circuit, which operates between 7 and 30 MHz, was found in Radio Electronics from the 1980s....
This microphone preamp found in a 1995 documentation offers stable microphone operation. The...
This is the receiver circuit for the previous remote control published in the same Radio...