On 9/27/06, Alan B. Pearce wrote: > >You'll probably find that making a bidirectional isolated > >interface is not trivial :) > > Amen to that. Explain me at least one good reason why you need an optoisolated programmer interface. Remember you'll never need to program a microcontroller directly connected to power supply phase -or just to the earth- (for this job you could disconnect the main connection while programming and pay a little attention to the target design and supply ) The AN2432 from Fresscale it's a little silly one. What is more expensive: building a bidirectional optoisolated debugger or to use an 1:1 isolator transformator for the target board while debugging/programming ? Vasile -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist