Some time ago i finished a pi-zero sized 'HAT' for a functionality i've noticed isn't on sale at major pi distributors.
tl;dr It's a low-cost low-noise ADC pHAT with both a line-in jack and a mic jack w/ pre-amp, with the ability to mix both sources; so basically instead of all those noiseless DACs on the market, this takes IN audio at 24bits, 96 KHz. There's an additional breakout for extensions, left to the discretion of the maker/end-user. Additionally, a software script allows for a one-click install.
(right click and open in a new tab to get the full resolution).
Older version with reflow soldering
It has optional power sources, including USB for people who are really picky.
I don't know how to take this further, I've tried sending a letter to pimironi to ask if they had any interest in distributing it, but was quite disappointed to hear zilch back.
So I'd love to hear what this community thinks in terms of:
* If you think there would be demand for such an add-on
* Are the built in features enough for what you may want out of it
* general nerdy comments and advice
* How to go about commercialising / distributing it
I'm excited to hear what your thoughts are. I don't think the price would be north of £20 - £25, more expensive than a phat dac obviously but many more components here.