QRP Club
QRP Station => Builder's Corner => Topic started by: vu2nan on August 19, 2019, 16:26:18 UTC
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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.
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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
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Hi OM Kees,
I guess we have a lot in common, sharing the same ideas and sentiments!
Many thanks.
73,
Nandu.