I have the slotexpander which was featured on the cover of an MCM issue. It came with some kind of external power supply, but it wasn't really necessary. I connected the external power supply once and it blew up all my inserted cartridges. Among them a Moonsound. So I don't use the external power supply anymore. But I do believe an external power supply is better because otherwise, the power must come from the MSX computer itself, right?
Anyway, that slotexpander probably is the Digital KC design as well. My 4th subslot doesn't work well. Probably because I don't use an external power supply? Furthermore, my music modules also don't work in this slotexpander.
So uhm, which design to use, dunno? I know Sunrise made one, but that version has an ATX power adaptor, it's not really handy. Better have some power supply which you simply plug into the wall 
I have the slotexpander which was featured on the cover of an MCM issue. It came with some kind of external power supply, but it wasn't really necessary. I connected the external power supply once and it blew up all my inserted cartridges. Among them a Moonsound. So I don't use the external power supply anymore. But I do believe an external power supply is better because otherwise, the power must come from the MSX computer itself, right?
Anyway, that slotexpander probably is the Digital KC design as well. My 4th subslot doesn't work well. Probably because I don't use an external power supply? Furthermore, my music modules also don't work in this slotexpander.
So uhm, which design to use, dunno? I know Sunrise made one, but that version has an ATX power adaptor, it's not really handy. Better have some power supply which you simply plug into the wall
I have design v3.1 with the last (I think) corrections.
I believe external power is a must. else only low powered devices will work when combined
and no worries I will test it extensively.
