[EDITED] Sorry... see second post please... I think answer can be found here : http://www.midibox.org/forum/index.php?topic=6887.0 [/EDITED] Hello, I have a little question about the OPL3 psu. For the Core modue 7-10V is recommended for the 7805 to allow it to work properly. For the SID module 6581 15V is recommended for the 7812 ( I imagine 12V is required for the 7809 of the 8580 version) So why in the opl3 psu 12V is OK for the 7812/7912 ? Why in this one, we don't need to have higher voltage before the regulators ? I'm curious, Thanks, Xavier