Voltage doubler AM detectors.

[catman]

G'day all, it's getting a bit late in the day (over here in Oz), but I'll do up a circuit tomorrow if I get a chance. It's nothing too complex, just a two diode 'doubler' detector terminated by a 27 k load resistor and a 220 pf RF bypass capacitor working into a simple MPF102 FET source follower audio buffer stage.

I use an untuned FET RF stage to provide some RF gain into the detector, as we are 100 odd miles from our 'local' AM transmitters, and all diode detectors like a reasonable amount of RF input to work optimally. Regards, Felix (vk4fuq) aka catman.