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Potentiometer question

Discussion in 'Electronic Basics' started by [email protected], Jun 10, 2008.

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  1. Guest

    How do you decide what pot to use from the eagle cadsoft library? I
    need to use a 2k board mount pot and would like to know the secret to
    picking the correct pot with the correct size for what I want to do.
    For example, I looked up the CA9V pot on the internet, but couldn't
    find what size it was. Do you print out the pots and manually place
    the pots on the page until you find the right size?

    I looked on the Cadsfot Forum for the answer, but evidently everyone
    else has figured this out,. Thanks
     
  2. Eeyore

    Eeyore Guest

    Presumably in the same way you'd choose one in real life.

    How complicated can that be ? <shakes head at newbie graduate ignorance>

    Once upon a time it was expected that kids going through Uni might at
    least have at least half a clue about the components they might
    encounter.

    This is one reason why companies don't especially rate graduates for
    practical intelligence any more.


    Graham
     
  3. Eeyore

    Eeyore Guest

    Can you wipe your own backside ? It's kinda the same thing.

    Graham
     
  4. Guest

    I really hadn't expected this kind of response to a serious question.
    I don't have a formal education in electronics, but am very interested
    in building some projects for a hobby that I enjoy.
    Perhaps I didn't phrase my question correctly, or "eeyore" is exactly
    what you are but whatever the reason you decided to flame me for is
    total uncalled for.
    I already have some board mounted pots that I can use for my
    project, but there are no markings on the pots to tell me who the
    manufacturer is or any other information that I could cross reference
    to information on the internet. The pots in the library do not show
    the pin spacing sizes. My question was how do the people of this
    group determine what size of pot they are going to use. There are
    several different pad layouts for pots. I thought the name of this
    group was sci.electronics.basics not lets.make,fun.of other.people
     
  5. Eeyore

    Eeyore Guest

    And just make sure you don't reverse the X orY dims or you'll feel a right
    prick.

    Understanding engineering drawings is VERY important for this.

    Graham
     
  6. Eeyore

    Eeyore Guest

    Might have been better had you indictated your level of expertise in that
    case.

    Trust me, you get ppl who've been (allegedly) doing this 10 yrs or more
    asking you to wipe their bottoms and it gets tedious.

    If you can read a technical drawing you shouldn't have any trouble. Best
    of all, get a sample part to confirm the dimensions and pinout.

    Graham
     
  7. Rich Webb

    Rich Webb Guest

    "Eeyore" is occasionally unsure on the concept of "basics." He's
    generally harmless, like the old guy in the corner who wakes up,
    shouts "What about '56, you arseholes?!" and then nods off again.
    See above.
    Pretty much like Tim outlined:
    1. Either
    1.a. Go to Digikey/Mouser/Allied/etc. to see what's really available,
    in what quantities, and with what specs.
    1.b. (Mostly for one-offs) Pull open the parts drawer labeled "Pots"
    to see what's on-hand and good enough.
    2. If there's not a matching footprint in the PCB layout library, use
    the part's datasheet or on the spot measurements to create one.
     
  8. Eeyore

    Eeyore Guest

    :.
    So how the heck do you know in which orientation they work ?

    Is clockwise rotation positive or negative function for example ?

    Graham
     
  9. Eeyore

    Eeyore Guest

    Nah, I'm only 54 next week silly.

    I have a big bark but if you actually ask sensible questions, I'll help you
    to the end of the earth.

    I do have a problem with fuckwits though.

    Graham
     
  10. Eeyore

    Eeyore Guest

    p.s. BIG HINT.

    Guys who do this all the time know how to deal with that. Positive
    application of the brain is a wonderful thing.

    Graham
     
  11. Bob Eld

    Bob Eld Guest

    Pay no attention to Eeyore, He's just braying like the jackass his name sake
    implies. Do not take it personal, he makes these noises often. I think now
    and then the toilet seat falls on his dick and it makes him very cross!
    Eeeee Haw!

    I would help you with the pot question but thought it specific to Eagle
    Cadsoft so didn't respond, not knowing Eagle.
     
  12. Eeyore

    Eeyore Guest

    Well .... in the early days, that was often the preferred method.

    No longer, it's 'top-side view' as the norm.

    Graham
     
  13. Eeyore

    Eeyore Guest

    The specific CAD package is almost irrelevant though why in hell anyone would
    willingly use Eagle is quite beyond me.

    Graham
     
  14. Rich Webb

    Rich Webb Guest

    Oy! I do apologize, then. Yer just a wee lad ... (compared to some of
    the fossils around here) but I've got a couple of years on ya. ;-)
     
  15. Eeyore

    Eeyore Guest

    Actually, it's the best answer anyone has so far given, not least the idea of
    getting a sample part to check form and fit.

    And if you want to check my muscles out, you're more than welcome any time. Even
    punks think twice before looking at me.

    Graham
     
  16. Jamie

    Jamie Guest

    Oh don't let it bother you, We have some rather ill mannered posters
    here that don't think their shit stinks!. Most of them come from the
    UK district!

    http://webpages.charter.net/jamie_5"
     
  17. Jamie

    Jamie Guest

    LOL!< the crap is rolling out now..

    http://webpages.charter.net/jamie_5"
     
  18. Jamie

    Jamie Guest

    Really, How quaint!


    http://webpages.charter.net/jamie_5"
     
  19. Eeyore

    Eeyore Guest

    You're a case in point.

    Graham
     
  20. Eeyore

    Eeyore Guest

    Careful or you'll get me started on the 20-30 somethings I can still pull.

    Graham
     
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