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Author Topic: A Chance Crystal Radio Project  (Read 198 times)

Offline vu2nan

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  • Nandu - VU2NAN since 1977.
    • Amateur Radio VU2NAN - Nandu
A Chance Crystal Radio Project
« on: August 19, 2019, 16:26:18 UTC »
A vintage unmarked inductor/transformer had been lying neglected in my junkbox for decades and I had to resurrect it.

Resistance checks showed that 2 windings, with a tap each, are terminated in its 6 pins. One measured 70 Ω with a 5 Ω tap and the other less than 1 Ω. A threaded core, with a movement of 5 mm is situated at the top of the unit.

The 70 Ω winding appeared to be suitable for a crystal radio. It was wired up as per the schematic shown below.

More details at

https://nandustips.blogspot.com/2019/06/a-chance-crystal-radio-project.html

73,

Nandu.

Offline PA1CJT

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Re: A Chance Crystal Radio Project
« Reply #1 on: November 06, 2019, 10:28:08 UTC »
Hello Nandu,

how simple it can be! Like going back to my childhood building with a minimum of components a simple receiver. People will be surprised hearing a radio station with a unpowered 'thing' with a connected wire and headphone....

73
Kees

Offline vu2nan

  • Midshipman
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  • Posts: 53
  • Country: in
  • Nandu - VU2NAN since 1977.
    • Amateur Radio VU2NAN - Nandu
Re: A Chance Crystal Radio Project
« Reply #2 on: November 07, 2019, 03:43:28 UTC »
Hi OM Kees,

I guess we have a lot in common, sharing the same ideas and sentiments!

Many thanks.

73,

Nandu.