>> An appropriate small N Channel MOSFET would work with ease as the >> voltage gain is close to infinite for practical purposes. You >> want... > I think you intended to say "current gain is close to infinite..." > :-) How about ... transconductance is extremely high ... :-) RM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist