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Series-tuned, Shunt-fed Crystal Radio with Air-core Coil


I've been following all your posts but have not built anything as I understand a good earth is essential in getting such radios to work correctly which I do not have, being on the first floor and surrounded by cement . I wonder do you have any circuits for a superregenerative radio?
 
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I've been following all your posts but have not built anything as I understand a good earth is essential in getting such radios to work correctly which I do not have, being on the first floor and surrounded by cement . I wonder do you have any circuits for a superregenerative radio?
Hi Fodendaf,

Why not use a water pipe earth?

Or service main earth (3rd pin)?

A crystal radio is much easier to build and get working than a superregenerative one.

Many thanks for following.

Regards,

Nandu.
 
I wound the inductor, all I had was 1mm wire and what I calculated from your circuit the coil worked out at about 104 uh. mine measures 110 uh with 17 turns on a 21.5cm former on a chinese tester device. I'll have to give up as I dont have any germanium or schottky diodes to hand, maybe if break up a disposable razor I could make a point contact diode but some other day.
 

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