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Thread: Odd power supply

  1. #1
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    Odd power supply

    Hello-
    I've got a bit of a noddle scratcher, and I thought you all would be the best people to ask.

    I've got a gadget I want to mount in my car. After looking at the power adapter, I found that the output is 12V AC, not DC. Is there a way to power this from my vehicle without having to plug it into a bulky inverter? My inverter is mounted far from the dash, which is where I plan to install the unit, so it makes it difficult to just plug it in.

    Any ideas?

    Thanks in advance!

  2. #2
    Raw Wave Rob Withey's Avatar
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    look in the gadget and see if it rectifies it as the first thing on the board. If so, the chances are you can feed it DC, perhaps bypassing the rectifier to eliminate the voltage drop (and ground offset if full wave bridge) of the rectifier if necessary.
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  3. #3
    Variable Bitrate billmee's Avatar
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    What is it?

    A door bell is the only thing I can think of that might use 12 v ac.

  4. #4
    Raw Wave Rob Withey's Avatar
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    Quote Originally Posted by billmee View Post
    What is it?

    A door bell is the only thing I can think of that might use 12 v ac.
    Add rs232 boards to your list of devices using ac : http://www.mp3car.com/vbulletin/powe...vdc-12vac.html There are many more devices too.
    Of course I'm not saying that the device in question here is an rs232 board.
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  5. #5
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    It's a radio scanner.

    In reply to Rob W: Totally over my head dude. Mind dumbing it down a bit? If it helps, Here is the parts list. May make the solution more obvious.

    Thanks for the replies, keep 'em coming!
    --T--

  6. #6
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    Quote Originally Posted by 90whiteRunner View Post
    It's a radio scanner.

    In reply to Rob W: Totally over my head dude. Mind dumbing it down a bit? If it helps, Here is the parts list. May make the solution more obvious.

    Thanks for the replies, keep 'em coming!
    --T--
    A parts list is not enough to find out if it rectifies the input voltage.

    A diagram would be nice, or a picture of the input portion of the circuit board.

    Else, try to feed it with 12V DC, nothing bad will happen. Either it works, or it doesn't - Easy!

    The polarity of the 12 V DC is not important in this situation.

    // Per.

  7. #7
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    I'll try to remember to take a picture later today. I'm nearing the end of my shift(Yes, it's 7am and my shift is nearing the END...), so when I wake up later I'll try to post a pic.

    Thanks again for the replies.
    --T--

  8. #8
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    Well, it worked when I put 12vdc into it. guess that solves that.

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