DARLINGTON BOARDS :

Power Darlingtons can be soldered directly onn magnets.
Otherwise, use this Darlington boards connected to power boards O4x64 (256 Outputs).
DarlingtonsDARLINGTONS WITH HIGH CURRENT OUTPUT
64 outputs for current<1A64 oututs for current up to 7A for heavy duty magnets.
Slider registers directly controlled by software on the KI7_MIDI_USB or KI6x8x8 without electronic interface.