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Correct potentiometer for a small speaker.

Discussion in 'General Electronics Discussion' started by Midas, Nov 21, 2012.

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  1. Midas

    Midas

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    Nov 21, 2012
    I am trying to find the correct pot to act as a volume control for a 32 ohms and 0.25 watts speaker. Most pots I have tried have given me about a couple of mm rotation from max to min volume. Any help would be much appreciated.
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,539
    1,967
    Nov 17, 2011
    Use fixed resistors to find the max resistance for an acceptable low volume. The value will be somewhere in the range 100 Ohm ... 330 Ohm. Once you know the max. resistance, find a pot with similar rating.

    Or use one of those pots you've already tested. Find the position where the speaker volume is "off" to your ears. Measure the resistance of the pot from wiper to start in this position and select a pot with fitting resistance.

    Harald
     
  3. Midas

    Midas

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    0
    Nov 21, 2012
    Last edited: Nov 21, 2012
  4. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    Nurse call patient handsets employ 32 Ohm speakers. I've seen 500Ω and 1KΩ pots used in them, depending on the manufacturer. I know that 1KΩ seems high for this but it is what it is.

    Chris
     
  5. BobK

    BobK

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    Jan 5, 2010
    That pot is outrageously expensive, probably because it is 2W. A standard 1/2 W pot would do for you.

    bob
     
  6. Raven Luni

    Raven Luni

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    7
    Oct 15, 2011
    Sounds like the pots youve tried are too high in value. Use a parallel resistor to lower the effective range. It wont be linear but does that matter?
     
  7. Midas

    Midas

    3
    0
    Nov 21, 2012
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