This circuit is from a Radio Electronics from March 1970. The crystal depends on the frequency at which the signal is to be captured and the resonant circuit determines the tuned band.
This circuit was obtained in a 1978 publication. The SCR may be the TIC106. What it does is act as a...
The gain of this amplifier is 10 times and the excursion to the output voltage is 6.0 V (peak to...
This capacitive-coupled stage can be implemented with any general-purpose transistor. The circuit can...