View single post by Slider2732
 Posted: Jan 22nd, 2017 09:46 PM
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Joined: Mar 3rd, 2008
Location: Muskogee, Oklahoma USA
Posts: 349
Hi John,

Unfortunately I don't have time at the moment to build one of these, but they are quite easy to make.
In essence, they are 2x high ohm coils, with a germanium diode in between.
1 coil will connect with it's inner wire end to the diode, the other coil will connect with its outer wire to the other end of the diode.
If I remember right, the 2 spare ends then connect together and the output is across the diode, which can then go to say a PC's mic input on a soundcard.
Audacity is good then for boosting the sound level and indeed any sound output can be listened to in real-time.