I have a really naive question: how can picoamp leakage parts be relevant in low impedance input pulse conditioning to an interval counter?
Tim N3QE > On Apr 11, 2017, at 7:46 AM, Bob kb8tq <kb...@n1k.org> wrote: > > Hi > > >> On Apr 11, 2017, at 7:05 AM, Charles Steinmetz <csteinm...@yandex.com> wrote: >> >> David wrote: >> >>> I ended up qualifying 2N3904s based on manufacturer and lot and I >>> think we ended up using ones from Motorola. I wish detailed process >>> information like National had was available from every manufacturer. >> >> It is, if you ask the process engineers for it. (From the Big Boys, that >> is. These days it seems discrete devices are being fabbed by dozens of >> "garage" operations. I can't speak for them, and wouldn't think of buying >> product from them.) > > If you dig into where your simple discrete part was made, you might be > surprised. That’s even true of outfits you would > consider to be a “Big Guy” from days gone by. The real answer to selection > today is to buy the automotive part. > That’s about the only thing anymore that locks down the sourcing, testing, > and the process. If you buy a “normal” part, > it might have been made anywhere by just about any process. Yes, that’s scary > and it raises a lot of questions. It is > a change that has happened over the last decade or two without a lot of > publicity. > > Bob > > >> >> Best regards, >> >> Charles >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.