In message , William Chops Westfield writes >My turn for what should be a simple question... > >Are "ceramic filters" the same as "ceramic resonators" ? I can go into the >local surplus store and find little three-lead devices labled "ceramic filters" >in all sorts of nice frequencies (ie 6MHz.), as well as "ceramic resonators" >in a more limitted range (3.58MHz) Will both of these work in the oscillator >circuit of a PIC? These filters are designed to be used as frequency-selective devices in radio receivers, rather than as simple resonators. They are unlikely to work properly in an oscillator circuit, as they actually consist of two resonators coupled together. Although they have three legs, they don't incorporate the capacitors necessary for oscillator operation. If you clip off one of the outer pins, it'll probably work as a simple resonator. I'd be inclined to try it and see what happens. 8-) Leon -- Leon Heller: leon@lfheller.demon.co.uk http://www.lfheller.demon.co.uk Amateur Radio Callsign G1HSM Tel: +44 (0) 118 947 1424 See http://www.lfheller.demon.co.uk/dds.htm for details of my AD9850 DDS system. See " "/diy_dsp.htm for a simple DIY DSP ADSP-2104 system.