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Stepping down speaker input to line level

Discussion in 'General Electronics Discussion' started by PMSM, Aug 21, 2016.

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  1. PMSM

    PMSM

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    Aug 12, 2016
    Long time solderer, first time circuit designer. I've got an electronic billboard has two speakers, which according to the spec sheet are 5 watts, 8 ohms, and I want to reroute the signal from them to a 3.5 mm jack, that I'm going to plug into some 10 ohm computer speakers.

    What intermediary changes do I need to make to the signal so none of the equipment is damaged? The audio file the billboard plays is mono, so should I bother wiring both speakers inputs into the new speakers? If not, is it safe just to throw an 8Ohm resistor on the side I'm not using? What else should I look out for?

    Thanks in advance

    -D
     
  2. Alec_t

    Alec_t

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    Jul 7, 2015
    Are these powered and amplified speakers, or just naked speakers?
     
  3. PMSM

    PMSM

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    Aug 12, 2016
    Powered and amplified. Edifier mp230s, to be specific.
     
  4. BobK

    BobK

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    Jan 5, 2010
    Line level is about 1/2V peak. Your 5W speakers are about 6V peak. So I would reduce the voltage with a voltage divider by a factor of 10 or so. I.e. 10K to the output 1K to ground, junction to the input.

    Bob
     
    CDRIVE likes this.
  5. PMSM

    PMSM

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    Aug 12, 2016
    Excellent, I'll definitely do that. Thank you Bob!
     
  6. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    May 8, 2012
    Gee Bob, I think you could have complicated this just a tad. After all if they were all this easy we'd have nothing to do here!:)

    Chris
     
  7. BobK

    BobK

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    Jan 5, 2010
    You are right Chris. I think maybe an 8 pole active bandpass filter using 4 Salen-Keys stages is required. Chebyshev response of course.

    Bob
     
    CDRIVE likes this.
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