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Cigar-box Crystal Radio

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Forum » Tecnica, Riparazione, Restauro, Autocostruzione ** » Auto-costruzione e tecnica radio in generale » Cigar-box Crystal Radio
           
Dejan Momirov
Dejan Momirov
 
RS  Articoli: 33
Schemi: 3
Foto: 119
06.Mar.12 22:01

Nr. ringraziamenti: 9
Rispondi  |  Devi effettuare l'accesso (Ospite)   1

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

Allegati:

Konrad Birkner † 12.08.2014
Konrad Birkner † 12.08.2014
Funzionario
D  Articoli: 2335
Schemi: 700
Foto: 3657
07.Mar.12 19:40

Nr. ringraziamenti: 13
Rispondi  |  Devi effettuare l'accesso (Ospite)   2

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.

Dejan Momirov
Dejan Momirov
 
RS  Articoli: 33
Schemi: 3
Foto: 119
07.Mar.12 23:12

Nr. ringraziamenti: 5
Rispondi  |  Devi effettuare l'accesso (Ospite)   3

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

Thanks for your advice,

Dejan

Konrad Birkner † 12.08.2014
Konrad Birkner † 12.08.2014
Funzionario
D  Articoli: 2335
Schemi: 700
Foto: 3657
08.Mar.12 10:52

Nr. ringraziamenti: 6
Rispondi  |  Devi effettuare l'accesso (Ospite)   4

I am sorry, I forgot the link.

Here is it.

Good luck,
KoBi

  
rmXorg