On 12/12/2010 01:49 PM, emc-users-requ...@lists.sourceforge.net wrote: >> There is then a lot to be said for removing IC1C, so the slow input is >> > discriminated only once. If pins 1& 3 are then connected, any small >> > same-chip threshold variation will have negligible effect, because here >> > the input flank is rather vertical. >> > Dooh, of course. I'll make the change. > http://www.wallacecompany.com/machine_shop/EMC2/Charge%20Pump/chpmp-5c.png > > If you're trying to make this circuit more universal, you could put IC1E on the output of IC1B, and then include a jumper on board so that the two buffer gates could select inverting or non-inverting polarity to signal CP-GOOD. I like to include a trace on board selecting one or the other as standard, and if you want to change it, you cut the trace, and add a jumper wire. Three extra plated through holes to pay for, but more universal.
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