Russell McMahon ha scritto: > How does a transformer and 2 resistors sound? Well, this is also good! (in parts, more or less what I have now). I actually did not think of much about alternatives since I was almost sure of the clamping diodes... I will consider one of these 2 approaches and some tests. thx! -- Ciao, Dario -- Cyberdyne -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist