Michael Watterson ha scritto: > Transistor outputs: I've only ever seen NPN commonly. Some vague memory > of triac/thyristor? Though I suppose PNP or FET is possible. triac output i.e. "photodiac" do exist - moc3020 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist