> I would think a std. opto driving a high voltage transistor would > be fine Thanks, I'm still weighing up options Trawling through datasheets I think the PC851 might be an equivalent http://datasheet.digchip.com/424/424-3-108466-PC851.pdf Radiospares have them -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist