I guess if you're going to build over 60 of them it starts to matter. I just figured if I'm going to go to this much effort it took just to build one at all, that $1 wasn't even visible, but a built and in-use rex that fails some day when it might have lived, is visible. So I went for the better-ish versions of all parts. The factors for this are not the same as for mass producing a clock that will sell in dollar stores.
On Wed, Oct 18, 2017 at 6:39 PM, Stephen Adolph <[email protected]> wrote: > Commercial is fine.... > > > On Wednesday, October 18, 2017, Josh Malone <[email protected]> wrote: > >> Also, meant to ask: >> >> Brian's BOM includes the Industrial variant of the CPLD. The >> commercial variant is almost $1 cheaper and seems well within >> tolerance >> >> (voltage min is 3 instead of 2.7, temp is 0 - 70 C instead of 40 - 85 °C) >> >> >> Any reason not to sub this part in? >> >> -Josh >> >> On Wed, Oct 18, 2017 at 4:56 PM, Josh Malone <[email protected]> >> wrote: >> > Thanks. I'm going to just order new parts and try again. >> > >> > On Wed, Oct 18, 2017 at 4:49 PM, Brian Brindle <[email protected]> >> wrote: >> >> 11.7k on 2 of mine. >> >> >> >> >> >> On Oct 18, 2017 4:25 PM, "Stephen Adolph" <[email protected]> >> wrote: >> >>> >> >>> I can try to measure it later today for you. >> >>> >> >>> On Wed, Oct 18, 2017 at 4:24 PM, Stephen Adolph <[email protected] >> > >> >>> wrote: >> >>>> >> >>>> either the chip is a dud, or you have soldered it down in the wrong >> >>>> orientation (which is kinda easy to do)... Do you have more CPLDs? >> >>>> >> >>>> On Wed, Oct 18, 2017 at 4:22 PM, Josh Malone <[email protected]> >> >>>> wrote: >> >>>>> >> >>>>> Thanks for the leads. >> >>>>> >> >>>>> I removed the CPLD and the resistance from 3v3 to gnd went to open; >> >>>>> repopulated it and it went to 3-ohms. Dunno what to try next. Maybe >> >>>>> put the same CPLD back on an original REX board (non-castellated) >> and >> >>>>> see what happens. But, I'd *really* love for someone to measure the >> >>>>> resistance on a known-good REX board and let me know what it should >> >>>>> be. Assuming the CPLD draws <= 1ma (datasheet says 17uA standby), R >> >>>>> should be over ~3k. >> >>>>> >> >>>>> -Josh >> >>>> >> >>>> >> >>> >> >> >> >
