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Potmeter "a" logo identification

Discussion in 'Datasheets, Manuals and Component Identification' started by TTL, Jul 22, 2017.

  1. TTL

    TTL

    180
    5
    Oct 24, 2013
    I'm trying to identify some 100K logarithmic potmeters I bought years ago, and ideally want the exact same kind.
    But I can't identify the brand which is an "a" inside a circle. Can anyone recognize it and shed some more info on the matter?
    I believe I purchased them from an electronics firm in the UK (Maplin, Bonex or Rapid perhaps) during the late 80s or early 90s I think.

    20170722-151519__MG_0853.jpg 20170722-151535__MG_0855.jpg 20170722-151547__MG_0856.jpg
     
  2. kellys_eye

    kellys_eye

    4,284
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    Jun 25, 2010
    The 'A' designation usually indicates the 'law' of the potentiometer - in this case A usually means 'linear' (B usually Log).

    Whilst this is common practise it's by no means standard practise though and depends on where in the world you are. See below:
     

    Attached Files:

  3. TTL

    TTL

    180
    5
    Oct 24, 2013
    Sorry, I wasn't quite clear about my request. The "a" I'm referring to isn't the "A100K" designation but the logo above it which I hope would reveal the manufacturer.

    PS. these are indeed logarithic potmeters (they were purchased from the UK). Thanks for the chart -a handy reference!
     
  4. kellys_eye

    kellys_eye

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    Jun 25, 2010
    Yes you were! Silly me didn't pay proper attention - d'oh....
     
  5. TTL

    TTL

    180
    5
    Oct 24, 2013
    No problem :)
     
  6. Arouse1973

    Arouse1973 Adam

    5,164
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    Dec 18, 2013
    The company is Alpha.
    Thanks
    Adam
     
  7. TTL

    TTL

    180
    5
    Oct 24, 2013
    Thanks, Arouse1973!
    Is this website of the Alpha you're referring to? The logo looks different, but they could have changed it since back then.
    Also I couldn't find the specific pot I already have, but again I suppose they could have changed their design. Does anyone recognize this exact pot and know where I can order one from (so it matches the "feel" and design of the other ones on my PCB)?
    20170722-151535__MG_0855-Edit.jpg
     
  8. kellys_eye

    kellys_eye

    4,284
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    Jun 25, 2010
    Arouse1973 likes this.
  9. Arouse1973

    Arouse1973 Adam

    5,164
    1,078
    Dec 18, 2013
    Yes that's the same company.
    Adam
     
  10. TTL

    TTL

    180
    5
    Oct 24, 2013
    Thanks guys!
    I'll keep on looking for the exact pot pictured in the postings above, but will keep the other options suggested in mind if I don't succeed.
     
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