Yes the ULN's will do fine, its the traces on the DOUT board from the ULN2803 output to the output header that concerns me (only when using ULN2803's) as they have to carry the load of an electo-maganet. On various pipe organ driver boards that incorporate ULN2803's, the traces and ground are beefed up. Pipe valve example: http://www.petersonemp.com/products/pdf/Seriesii.pdf (pdf) Thanks.