Bob, > Any kind of film capacitor is going to be an order of magnitude > better. There is improvement using metal polyester caps. The drift is about 110=20 counts. All the drifts are to the higher side. Will carry on more experiments. Cheers Ravi --=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 .