KY1K wrote: > I need something that will oscillate between 55 and 65 Khz. It has to draw > microamps of supply current, and I prefer the control voltage range to be > between 1 and 3 volts. > > I'd like to have a chip solution if possible. The obvious answer, a CMOS 555, draws 100 uA typical (16 uA for the internal divider alone). You can probably do better by building an oscillator based on a micropower opamp or comparator. Also, search for low-power "voltage to frequency converters" intended for use in remote sensors. This sort of question will probably get better answers under the [EE] tag. -- Dave Tweed -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist