Dear Mr. Thorsten, Could it be that there is a 'typo' in the Midibox16E pages & in the pdf schematic ? You mention STEC16B36 (at RS) This part is very hard to find, I think it should read STEC16B03 Not a big problem, but still it may confuse some ppl at first, (like me :) ) Best regards & thanks, DriftZ