Apart from a few mistakes, both the PCBs worked, so I could quickly build two stereo devices, a low-pass and a high-pass.
![](http://cmosorchestra.com/wp-content/uploads/2024/02/IMG_4804-1024x768.jpg)
It sounds great, just like I knew it would, so here’s a quick demo!
(WARNING: extreme resonance-watch your volume)
And a youtube short, impossible to embed for some reason: