I thought I should add this! its a response to an email I got yesterday
Can i power the fart box with my eurorack power supply?
YES
You can just skip a few components on the fart box as it has a built in power filter
No need to solder in :-
D9
D10
D11
D12
D13
D14
U8
U9
C17
C18
The above are the components you won’t need if your powering it from the Eurorack. You can still put them in, it will work either way
Solder the eurorack +12v to the positive leg of C4
Solder the eurorack -12v to the negative leg of C5
Solder GND to the negative leg of C4
That will make it powered by the eurorack power