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You could try the Raspberry Pi4 USB-C PSU. Lot less crap on it than most.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of cheater cheater via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> 18 July 2023 11:48<br>
<b>To:</b> synth-diy <synth-diy@synth-diy.org><br>
<b>Subject:</b> [sdiy] Transporting line level audio in home / buzz-free USB wall warts?</font>
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<div class="PlainText">Hey all, I wanted to move audio from my media pc to rooms in my home<br>
and I was wondering if anyone had suggestions on an inexpensive piece<br>
of gear that'll do that. I just want to listen to podcasts and some<br>
music while i'm doing stuff around the house, nothing high quality,<br>
but I'd prefer not to have hum and static and strong high freq<br>
rolloff. I'd prefer to do this in analog so that I can turn on<br>
multiple speakers and they're in phase. I'll be moving the audio over<br>
a distance of ~ 10-15 meters to 4 different zones. In the target rooms<br>
I'm going to hook up inexpensive bluetooth speakers with aux input<br>
running off of a usb wall wart.<br>
<br>
Also looking for inexpensive European (Schuko-style) USB wall warts<br>
that don't have a lot of ripple. I have tried a bunch (~10?) of<br>
different usb power supplies over the years and almost all of them<br>
make the speakers buzz audibly. The only one that I have that doesn't<br>
do that is an ancient Samsung one that I got with I think my Galaxy<br>
S3. I hope it never dies to be honest.<br>
<br>
Obviously a better power supply circuit in the bluetooth speakers<br>
would make them not buzz, but I tried two different ones (starting<br>
with Anker Soundcore 2 and most recently Earfun UBoom L) and they all<br>
do that so... it is what it is.<br>
<br>
Best regards<br>
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