The 74HC4046 requires way to much power, but thanks for the suggestion. It varies with vendor, but the lowest quiescent current I found was 80 ua, and that's WITHOUT the VCO running! It looks like the cmos Shmitt trigger inverter free running oscillator will use 12-14 ua at 60 Khz. The frequency of the oscillation is changed by varying the supply voltage. I have a pdf if anyone is interested in the circuit. It's pretty tough to get any supply current usage less than that:>: BUT, I'm open to suggestions if anyone has another suggestion:>: Art >CMOS4046 PLL (74C4046 etc) -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist