Leaderboard

there is no action on the BLM-Midi-Output by pressing one of the 8 buttons. there is no action on the Buttons-LEDs when receiving (the right) note on/offs via BLM-Midi-Input its a bit tricky to desamble the 32Bit BLM ;)

Many thanks for FW updates. I've added them to the OP. @Phatline Check that all diodes and LEDs have the correct orientation Those middle 8 LED pairs have their cathodes sunk on the transistors nearby (Q37 and Q35) so check the soldering there, also the adjacent resistors. Do all sets of four cathodes show continuity? Are any shorted to ground? Bases of the transistors go to RN18 (not labelled on your PCB) pins 12 and 14 respectively RN outputs to IC18 pins 4 and 2 respectively

you can use a standard linear regulator, no need to spend 13 quid on a fancy switching one, it wont get very hot. 2A will be plenty, I measured ~1.1A on mine using 12V (700 mA for the SIDS!)