-=> ROY J. TELLASON wrote to WAYNE CHIRNSIDE <=-

 WC> Popular Electronics ran a circuit of a modified Xtal reciever
 WC> where the signal diode was biased into it's active region by a
 WC> common carbon - zinc battery with the bias voltage adjustable to
 WC> just above the barrier voltage with a center tapped 1.5 Meg ohm
 WC> potentiometer IIRC. Never built the critter but it looked good on
 WC> paper.

 RJT> I ran across something pretty similar on a web site,  only they used a
 RJT> schottky diode,  and a watch battery.  No real current drain,  since it
 RJT> was biased just short of conducting,  but it did reportedly have a heck
 RJT> of a lot of sensitivity.

I always intended to purchase some Shottky diodes from DigiKey but
never got around to it. 

 RJT> I forget what he did for headphones,  not being able to get those other
 RJT> ones.

 RJT> Maybe a piezo "buzzer" would work?  That's basically the
same idea,
 RJT> isn't it? And they're scroungable here and there...

Perhaps, don't know.
 
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