Cigar-box Crystal Radio

Hallo crystalophiles,

On the Internet I have found several crystal radios, built in an cigar-box, and decided to make one myself. First (after emptying the box!), I made a high-Q basket-coil for the tank-circuit. The antenna-circuit have adjustible coupling with it, so I can choose between the sensitivity and the selectivity. Antenna coupling changes automatically, using the second section of the first two-gang cap. The best chosen germanium-diode goes from the top of the coil, to get the highest possible RF voltage. Load to the tank-circuit is minimized by using an self-made impedance-maching transformer, with taps for different phone - impedances. It works good, especially with my extra-sensitive balanced-armature phones (Google will find it under "HIBAPHONE"). 

So, I would like to share my experience with you.

Regards,

Dejan

• cigar-box radio (63 KB)
• cigar-box inner view (120 KB)
• Cigar Box Radio-shematic (79 KB)

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Hello,

we have a page where you can upload pictures and add text in the picture legend (not in the page) please.

Your forum thread can be moved.

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Sorry, but as a new member I don't know all the possibilities jet. Which page could it be?

Thanks for your advice,

Dejan

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I am sorry, I forgot the link.

Here is it.

Good luck,
KoBi

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