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Powering Amp Boards - Car (14v) and Home (120v)

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  • Powering Amp Boards - Car (14v) and Home (120v)

    I've done some searching and haven't come up with much concrete information.

    Looking to power Class D amp boards both at home and in car. Interested in these new Class D boards with built-in DSP:

    And perhaps one of these for subs:

    For home use I've seen people use a laptop power supply. Is this reasonable?

    For in car use I have no idea how to proceed. Is a boost board sufficient? Do you need to stiffen in with large amounts of capacitance? Anyone tackled this before?

  • #2
    For home use, nothing wrong with a laptop supply if it has the right voltage and sufficient current capability. Be careful about adding huge capacitance to a laptop output, you might make it oscillate unless you insert a little series resistance.


    • #3
      This bugger for car applications:

      It's limited to 100W though, so it'll do smaller power amps or you'll need multiples. I haven't dug elsewhere on the internets to find a similar power supply that has higher power capacity.

      Adding large amounts of capacitance isn't recommended after the power supply (either application), could damage them due to the current in-rush to charge up the caps. For cars, the big capacitance goes before the power supply but is of little use until you're looking at 40A + power lines to a trunk or something. I'm not in the massive watts + subs club for cars, I just want about 100dB peak capacity and 30Hz extension which is fairly easy to do with 100W and good woofer design.
      Electronics engineer, woofer enthusiast, and musician.
      Wogg Music
      Published projects: PPA100 Bass Guitar Amp, ISO El-Cheapo Sub, Indy 8 2.1 powered sub, MicroSat, SuperNova Minimus