Hey Madox and TK, thanks for your input on this, I will definitely look into both options as we come up to buying, building and finishing this project. madox: I was mainly using the Optocouplers for that reason, which makes the fets perfect (no loading on the signal line!). TK: I had a look at the LTC before, and noticed that part of design, however i didn't look to deeply, so i will have a dig and see what i understand. anyway cheers Chris.