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 was indicated by American documentation from the 60's. The circuit is intended to...
The action of this circuit, found in a 1977 amateur radio documentation, is like to a delay line....
This tunnel diode oscillator was found in July 1986, Radio Electronics magazine. Note the low...