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dc - ac

Discussion in 'Electronic Design' started by Josh, Mar 10, 2007.

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  1. Josh

    Josh Guest

    How to convert 9.6 NiCd battery (DC)
    to 12 volt ac, or even something close to 12 volt ac.
    Thank you
  2. Day Brown

    Day Brown Guest

    How many amps?
  3. Josh

    Josh Guest

    It is 12 volts ac 2.5 amps - and i want to power it with an rc car
    battery rated at 9.6 volts dc 700 mAh, or i could use my other rc car
    battery which is 9.6 volts dc 1100 mAh.

    Thanks for responding
  4. legg

    legg Guest


    You are not going to find parts for this around your house.

    You should be able to find a screw driver, though. Use this to open up
    the device you are trying to power, and figure out what happens to the
    original 12V AC. You may find that there is one place in the circuit
    that will accept a DC voltage, to function normally.

    Once you know what this voltage is, you can develop a battery source
    to provide it, fairly easily.

  5. Josh

    Josh Guest

    Great - i will look into that. Thank you so much for your help.
  6. Guest

    Nothing's ever this easy. What if the device uses a half-wave
    rectifier to generate a bipolar supply from the AC?
  7. The OP doesn't have a clue. And this is really for anyway.
  8. Donald

    Donald Guest

    Well, lets ask the OP, Hey OP do you have/know what a volt meter is ??
  9. Josh

    Josh Guest

    Yes i do, i have one and have used it many times on many things. I
    tried opening the trans. but unfortunately the plastic casing is
    sealed - so there is no way to open it without damage.

    All i am trying to do is find a cheaper source of converting dc to ac
  10. Josh

    Josh Guest

    I just dont want to destroy something that works perfectly fine, and i
    dont feel like getting a battery in my face either. whats really
    strange is that my friend took an ac powered subwoofer and put a 9
    volt battery on it to power it. It must be such a low battery amperage
    that it doesnt cause an immediate problem - but his battery life sucks
  11. Josh

    Josh Guest

    I have decided to just buy a car stereo amplifier to do this job.
    Thanks for everyones help and ideas
  12. Eeyore

    Eeyore Guest

    We need to know how many amps the amplifiers use, not the rating of the

    How many watts of audio do you want / need ? How long does it need to last
    before recharging ?

  13. Forget it. Won't work.
  14. Eeyore

    Eeyore Guest

    Pretty unlikely I'd say.

  15. Eeyore

    Eeyore Guest

    You don't need to.

    Electronics actually runs on DC.

  16. Eeyore

    Eeyore Guest

    Does the battery life suck even when (a) the sound is quiet or (b) just when
    it's quite loud most of the time ?

    If (b) you're not going to be able to fix that.

  17. I have a toy that runs off 4 C cells or a 4 VAC adaptor - it clearly has a
    split supply.
  18. Guest

    Maybe. Either way it's not a half-wave rectifier I meant, it's a
    voltage doubler, but anyways...
    I don't see why it's that unlikely. It's a great way to generate a
    bipolar supply.
  19. jasen

    jasen Guest

    For audio?

    with a 2.5A input it's maximum 30W dissipation, so probably under 15W output,
    12V DC is plenty for that.
  20. jasen

    jasen Guest

    only if you don't mine the ripple.

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