Hello @alexpikkert, @JackANDJude, @pjd,
Thank you Alex for posting this filter module
I would like to add a power reduction bit to the cool circuit of Pjd.
Thanks to the LittleBits Hatdware Development Kit, it is possible to make permanent usable bits. And perf board is perfect usable.
I used perf board with copper lanes and use a small drill to cut tracks.
So, here is some info and pictures of the power and filter module
I adder a delay bit behoren the speaker , fun fun fun