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.
August 2017 - MCUs of the new Infineon MC1400 series for industrial use can now be purchased from...
In this circuit, the output voltage is Vxx plus the zener voltage. The circuit is from the SGS...
This circuit can be used in traffic alarm systems. The relay trips when the light falling on the...