Dual rail power supply (4HP)
DSupply by Andrew Kilpatrick.
Dintree's simple, small and inexpensive power supply, converted into a 4HP Eurorack module.
I am scared to death of dying from poking around mains voltage, so being able to use a regular laptop power brick is a godsend.
Only one side of the expander PCB will really be useful when placing this module right at the edge of a case. I usually fill the other half with as many electrolytic capacitors as will fit.