This bistable circuit that drives a relay with a pushbutton was found in the March 1pp6 issue of Electronics Now magazine. A common bipolar with a 1k resistor at the base can be used in place of the FET.
The gain of this circuit at 1 kHz [and 40 dB falling rapidly when the frequency deviates from this...
This circuit has the effects indicated in the table next to the diagram. We found it in the Radio...
This ultra-low frequency receiver circuit was published in the August 1973 issue of Radio...