<div dir="ltr"><div dir="ltr"><br></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, May 27, 2020 at 12:56 PM El Fontanero via talk <<a href="mailto:talk@gtalug.org">talk@gtalug.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div>On 2020-05-27 12:39 p.m., Russell
Reiter via talk wrote:<br>
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<div>I also had a weird experience when I used a line adapter
to plug a guitar into the line in and play out the speakers.
After I defined the loopback device for pulse audio I'm not
sure what it was but, when I adjusted the potentiometers on
the guitar for base, treble and volume, I seemed to be able
to tune in an audio broadcast channel and got that signal
out the speakers. I know it was a broadcast, I heard it
clearly, it was a one sided conversation, but in a language
I don't know.</div>
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<p>The guitar has big coils: the circuit has high impedances, and in
the case of a connection to a regular audio line input, it's not
optimally terminated. And bingo, an impromptu radio receiver. We
used to hear a HAM radio operator key up transmission through our
subwoofer. You could see his antenna rising up over the houses a
block over.<br>
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<p><br></p></div></blockquote><div>Thanks for that explanation. You read about weird edge case RF stuff like that but unless you actually experience it for yourself, it can be hard to sort out the source of the issue. </div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><p>
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<div>So my thought was to get an audio breakout to usb via the
Thunderspy port, but that would defeat the purpose of using
the Realtek codec features of the board. What I really need
is a good quality junction between the guitar phono I/O and
the computers stereo line-in.</div>
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<p>Guitar in to a mic preamp is not as exciting but is fairly
clean. From there you can go to line level with impunity.<br></p></div></blockquote><div>I had a look around for non usb direct input hw. The ones with the 3.5mm output are a couple of hundred bucks. The direct phono jack adapter and cable I used with 3.5mm connections at both ends cost about ten all total. The sound is clean enough, but the mechanical connection causes a lot of static. The fittings don't match to high enough tolerances and the cord jiggles the connection too much when I play it.</div><div><br></div><div>Reminds me of when I was ten and built a crystal radio. I was disappointed that I could only tune in one station, 1050 CHUM AM, the closest one to my house. </div><div><br></div><div>Looks like I accidentally anachronistically recreated CFRB (Canada's First Rogers Battery) using a two thousand dollar Linux solid state home computer system, a forty dollar electric guitar and cheap ebay audio fittings and cables, although I'm pretty sure that wasn't CFRB I was tuning in.</div><div><br></div><div><a href="https://torontoist.com/2012/12/toronto-invents-the-batteryless-radio/">https://torontoist.com/2012/12/toronto-invents-the-batteryless-radio/</a></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><p><br>
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<p>Linux, Linux, Linux. There. :-)</p>
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<p>Cheers,<br>
Mike<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Russell<br></div></div></div></div></div></div>