/diy/ - Do It Yourself

>>1691250
>I generally recommend a capacitor
Alright i am back home. I tried adding a 100nf nonpolarized cap between arduino ground and audio ground (>>1690863 that jack ground and arduino ground line now has the cap in it)
I attached my oscope probe to arduino ground and output from the opamp
and i got this gorgeous crisp sine out, i was so happy that it finally worked... but then as in an attempt to mock me, after running for a bit, the sine got more and more inbred until there was nothing left
see the video, it starts with the cap discharged
The audio source is outputting a stable 477hz sine and i am not touching anything at all. If i short the legs on the cap to discharge it the process repeats all over again