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Thermocouple mux

Discussion in 'Electronic Design' started by Marco Trapanese, Nov 25, 2012.

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  1. But I've always kinda been partial to calling myself up on the phone
    and asking myself out, you know? Oh yeah, you call yourself up too
    huh? Yeah, well one thing about it, your always around. Yeah I know,
    yeah you ask yourself out, you know, some class joint somewhere. The
    Burrito King or something, you know. Well I ain't cheap you know. Take
    yourself out for a couple of drinks maybe. Then there'd be some
    provocative conversation on the way home. Park in front of the house
    you know. Oh yeah, you smoothly put a little nice music on, maybe you
    put on like uh, you know, like shopping music, something thats not too
    interruptive you know and then uh slide over real nice and say 'Oh I
    think you have something in your eye'.

    -- Tom Waits

    (Burrito King in LA is pretty good, IMHO).
  2. Guest

    i(c) = 5 fA, Vbe=0. Nice. I bet i(cbo) is even lower.
    And still are.
  3. Il 26/11/2012 21:58, Spehro Pefhany ha scritto:

    Thank you for your clarification!
  4. josephkk

    josephkk Guest

    First question, how often do you want to switch versus the full settling
    time of the meter? BTW nothing is all that bad with magnetically
    latching to-99 relays for this application.

  5. Il 28/11/2012 10:26, josephkk ha scritto:

    I need to acquire both tcs every second. What do you mean about the
    settling time? The electrical settling time should be negligible, and
    the thermal one shouldn't matter.

    I'm going to use the solution with an AD773 to easily read both tcs and
    an ambient temperature sensor for cold-junction compensation.

  6. And me. I had a kids electronics breadboard kit thing that came with two
    2N2222 or some such, TO92 packages anyway. Within two minutes I had
    snapped a leg off both of them, so tried to make new ones out of the

    That worked really well.

    That was my first encounter with electronics, looking back can't believe
    I got anywhere with it!
  7. The digital filter can take hundreds of milliseconds to settle,
    depending on the configuration. It's all in the data sheet.

    Best regards,
    Spehro Pefhany
  8. Guest

  9. Fred Abse

    Fred Abse Guest

    The former is a transistor, the latter a diode pair.

    Not surprising they don't work the same.
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