At 11:26 PM 2/2/2003 -0800, you wrote: >Doesn't "schmidt trigger" imply some positive feedback to "snap" the >output/internal gates to a digital state especially quickly, in addition to >the hysteresis? (rather than leaving transistors/etc in a possibly linear >region of operation, prone to oscillations and/or excessive power >consumption.) In fact, I thought the hysteresis was a byproduct and/or >method used to achieve this capability, and the "important" part of a >"schmidt trigger" was its ability to correctly operate with slowly changing >(ie analog) input levels... Yes, that's right. The specs fro the actual amount of hysteresis and the transition voltages are horribly loose, so using a gate as, say, the active element in a relaxation oscillator, is fraught with peril. ST .-------| | ' |& |o-----.---o +----+--|__| | | . | C --- | ___ | --- '--|___|-----+ | R | === GND Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.