Quoting PAUL James : > > John, > > 3.59Mhz as a watch crystal? I have never heard of this. Most of the > watch crystals I've seen have been 32khz. > The 3.58 mhz crystals (actually 3.579545 mhz) are for color burst in a > color TV. > > If there is a 3.59 mhz watch crystal, that must be some watch. Probably a circuit operating at that frequency would use too much power for a reasonable actual watch, but 4MHz-ish crystals are available in the small but inconvenient cylindrical case "watch crystal" format that normally houses the 32kHz-ish tuning fork crystals. I've seen some with horrifying tempcos, worse than resonators, so caution is called for unless you're deliberately making a temperature sensor (ye olde f*rts may recall Hewlett-Packard's leading edge efforts in thermometry*) *D. L. Hammond and A. Benjaminson, ?The crystal resonator ? a digital transducer,? IEEE spectrum, pp. 53-58, April 1969. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" s...@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist