> You COULD try a resistor (seriously) (although the results would > be poorish) As the primary is 14k DC resistance and I'm only after a proportional indication of mains voltage, would "poor" allow enough voltage (rather than current for a load) to be available to do this ? I agree that a 240V primary would be the best answer, but to complete the two prototypes I'd like to use those I've already got. Mostly because they're a perfect size. Mostly -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist