>> The inductor should be rated for 200 mA operation. ... >> What are the physical dimensions of your inductor? > 0.125" x 0.375" maybe? Like I said, about the size of a quarter > watt > resistor. I picked up a bunch of stuff from mouser, several > inductors > and a bunch of different caps to play with this circuit. I probably > bought the wrong stuff, oh well, trial by fire. Literal fire maybe :-) That inductor will be useful - but not for this application. Ensure that the inductor is rated for at least 10 mA and preferably 200 mA or more. The more the better but size will grow and/or inductance will drop as capability grows. The IC manufacturer will almost certainly have a recommended inductance value BUT current handl;ing capability is, within reason, more important than inductance. Too low and the operating frequency will probably try to be too high BUT there is a wide range of latitude. RM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist