Unlike the previous circuit, the output of this one goes high in the window voltage range. The circuit is from Radio Electronics from June 1986 and is based on the CA3140.
We found this circuit in a 1978 publication. The flip-flops are of the T type and the time...
This circuit generates a signal up to a few megahertz depending only on the LC resonant circuit...
This simple receiver with germanium transistor and listening on a crystal phone was discovered in a...