From Newsgroup: alt.comp.os.windows-11

On 2026-09-27, J. P. Gilliver <G6JPG@255soft.uk> wrote:

On 2026/9/27 2:55:14, c186282 wrote:
[]

"Crystal" radios were kinda interesting. If near
an antenna you didn't even need a battery. Don't

(I think the definition of a crystal radio is that it had no amplifying devices, so needed no battery; it could only _get_ strong stations,
unless a big aerial.)

I once saw a schematic for a radio with two tuners. You tuned one
of them to the strongest local station, whose signal was rectified
and used to drive an amplifier for the other tuner, that tuned the
station you actually wanted to listen to. Still no battery.
--
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\ / <cgibbs@kltpzyxm.invalid> | two kinds of people:
X I'm really at ac.dekanfrus | 1. Those who can extrapolate
/ \ if you read it the right way. | from incomplete data.
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From Newsgroup: alt.comp.os.windows-11

On Sun, 27 Sep 2026 09:49:08 +0100, J. P. Gilliver wrote:

[snip]

"Crystal" radios were kinda interesting. If near an antenna you
didn't even need a battery. Don't

(I think the definition of a crystal radio is that it had no amplifying devices, so needed no battery; it could only _get_ strong stations,
unless a big aerial.)

You need a high enough voltage at the detector (crystal).

I had one that was a little more advanced. One transistor (AF amp, so you still don't get many stations). Power came from a lemon.

[snip]
--
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Mark Lloyd
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