Quick Login

Author Topic: A Chance Crystal Radio Project  (Read 69 times)

Offline vu2nan

  • Warrant Officer Class One
  • *
  • Posts: 48
  • Country: in
  • 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.