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

[vu2nan]

There's been an update.

http://nandustips.blogspot.in/2015/04/unusual-crystal-radio-circuit.html

73,

Nandu.

 

[fodendaf]

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?

 

[vu2nan]

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.

 

[fodendaf]

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.

 

[vu2nan]

Broken link rectified.

https://nandustips.blogspot.com/2015/04/unusual-crystal-radio-circuit.html

73,

Nandu.