Quote:
Originally Posted by Ed in Tx
No battery needed. You just need a good ground, RF from an antenna, and high impedance headphones or an earphone. Those are the 4 connections it has. Power is from the rectified RF. And of course replace the bad diode if it is indeed bad.
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OK, thanks. What kind of diode should I use in this thing? The original one looked like an old Germanium signal diode, like what is used in old TVs and Radios.