Without digging up specs - my long ago memory is that you can get larger delta-C from larger voltages. If so, might a HV supply for tuning (agh!) assist. Presumably o\power consumption is minimal. Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .