A little more expensive, but not much

https://espotek.com/labrador/product/espotek-labrador-board/

may be worth a look - its (very) small, fully open source software and
while I had a different use case, worked for me. Looking at the web
site, I probably ought to update my software version before I use it
again.

MArtin

On Thu, 22 Apr 2021 05:30:55 -0000 (UTC), bob prohaska
 wrote:

>Computer Nerd Kev  wrote:
>> bob prohaska  wrote:
>>> Has anybody used a USB sound capture device for an audio frequency
>>> oscilloscope on a Raspberry Pi? xoscope is available using apt,
>>> but I can't find any reference to what sound devices, if any, it
>>> can use over USB.
>>
>> Xoscope's webpage says it supports ALSA as an input source, so as
>> long as a USB audio adapter is working with ALSA (the cheap Chinese
>> ones seem to do so without issues) it should be fine.
>>
>Ok, that's a good hint. I'm looking at something like:
>https://www.amazon.com/DIGITNOW-Capture-Grabber-Cassette-Converter/dp/B079CBGD
ST/ref=pd_rhf_dp_p_img_2?_encoding=UTF8&psc=1&refRID=YV3EVDFX4FWZF58TY2CW
>There are reviews saying it works with Raspberry Pi, so maybe it'll work
>with xoscope. It doesn't have to be good, just good enough to catch
>sags and spikes on a timescale of milliseconds.
>

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