> Then if you really are looking for an op-amp then you looking for the wro= ng thing. > Check out the following devices > Linear Technology > LT6100 > LT6106 (goes to 36V) > Analog Devices > AD8210 - this does bi-directional current sense, but they have others in = the current sense family. > Zetex > ZDS100x Current Sense devices (they have trimmed this range considerably = since being taken over by Diodes Inc). > Supertex Inc > HV78xx family Current Sense chips (some go to 450V for mains use!). > If you really must use an op-amp then maybe Analog Devices AD8675 36V R-R= Op-Amp might do, but I know nothing about the pricing. Thank you for your suggestions. I will search for a high side current amplifier too. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .