Re: USB microscopes for very small SMT

Joel Koltner wrote:
"Joerg" <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote in message news:TQz_k.9442$c45.3508@xxxxxxxxxxxxxxxxxxxxxxx
For example, one classic mistake I find in my consulting practice is the use of too high impedances in low-energy sensing circuits. A little moisture, a little dirt, and it'll be on the fritz. The right way is to use low impedances and then pulse-measure. But it seems universities don't teach that stuff anymore.

They're concentrating on "low power" (what every laptop needs, right?) so the students naturally gravitate towards high-impedance designs...


Laptop designers seemed to have "un-learned" that as well. Until recently when the Intel Atom came out and (some) laptop designers "re-learned" the art. When Howard here in the NG mentioned the Samsung NC-10 and I saw it gets >6h, like my old Compaq Contura used to, I honored that laptop performance with an order. Seems others have done the same since I initially received a backorder notice despite the fact that "in stock" was mentioned. Should arrive in a few days :-)

I often encounter folks who are quite unfamiliar with the scheme of saving battery power via pulse action instead of high impedance. Students need to re-learn the old art of obtaining some of their wisdom from non-academic sources. I'd venture to say that >50% of the knowledge I use in my practice is from non-academic sources. App notes, Internet, ARRL books and such.

--
Regards, Joerg

http://www.analogconsultants.com/

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Relevant Pages

  • Re: USB microscopes for very small SMT
    ... of too high impedances in low-energy sensing circuits. ... Laptop designers seemed to have "un-learned" that as well. ... saving battery power via pulse action instead of high impedance. ... I use in my practice is from non-academic sources. ...
    (sci.electronics.design)
  • Re: USB microscopes for very small SMT
    ... of too high impedances in low-energy sensing circuits. ... They're concentrating on "low power" (what every laptop needs, right?) so the students naturally gravitate towards high-impedance designs... ... When Howard here in the NG mentioned the Samsung NC-10 and I saw it gets>6h, like my old Compaq Contura used to, I honored that laptop performance with an order. ... Students need to re-learn the old art of obtaining some of their wisdom from non-academic sources. ...
    (sci.electronics.design)
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