Jon Chandler wrote: > Thanks, That's a good idea about adding a blocking diode and > compensating for the voltage drop with an additional diode. It can be useful, but note that you lose voltage accuracy. If you're using Vdd as your A/D reference making absolute measurements, this scheme may add too much error. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist