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Thread: Where to get regulator for cars 12v to regulated +5v 2amp?

  1. #1
    FLAC ppgt94's Avatar
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    12v unregulated -> regulated 5v 2amp? (for "in-dash" dvd-rom)

    (Yes I did a search)

    I'm going to install a slot load dvd drive into the dash. I need a way to get clean 5v to it. Since my 'puter is in the trunk I rather not extend anything from the psu. I have some 12v sources I can tap into from the dash but how can I get a safe 5v 2amps to the drive? Thanks in advance.

  2. #2
    FLAC Chairboy's Avatar
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    7805 regulator, use same circuit as this 7512:
    http://www.mp3car.com/vbulletin/show...570#post240570

  3. #3
    FLAC ppgt94's Avatar
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    Is there some prefab unit I can buy?

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    FLAC Chairboy's Avatar
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    Uh, it's essentially already prefabbed, It's a single part, you just hook your wires straight to it. It doesn't get much better.

  5. #5
    FLAC ppgt94's Avatar
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    OK, sorry. That was a thread with many different things on it, including some diagrams. It looks like they are 1amp regulators. Will this work for a dvd-rom? I think it may need 2amps.

  6. #6
    FLAC Chairboy's Avatar
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    First, the link I sent went straight to the 7505/7512 circuit. Second, didn't realize you needed 2 amps, the 7505 will provide 1 amp, so.. sorry. I suspect your drive will work fine on 5v 1amp, but no way to tell without trying.

  7. #7
    FLAC ppgt94's Avatar
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    Quote Originally Posted by Chairboy
    First, the link I sent went straight to the 7505/7512 circuit. Second, didn't realize you needed 2 amps, the 7505 will provide 1 amp, so.. sorry. I suspect your drive will work fine on 5v 1amp, but no way to tell without trying.
    Thanks. I appreciate it. I'll have to try it out.

  8. #8
    Raw Wave rando's Avatar
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    A linear regulator is going to get fairly hot dropping 12-14V down to 5v at 1A. It would have to dissipate upto 9W! You're going to need a good heat sink and fan or your regulator is just going to shut down or even go poof.

    Search the forums for 'Sproggy' and consider building just the 5v portion of that circuit. A single 5v rail of the Sproggy should easily give you 1-2A without too much of a heat problem.

  9. #9
    Constant Bitrate
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    Quote Originally Posted by rando
    A linear regulator is going to get fairly hot dropping 12-14V down to 5v at 1A. It would have to dissipate upto 9W! You're going to need a good heat sink and fan or your regulator is just going to shut down or even go poof.

    Search the forums for 'Sproggy' and consider building just the 5v portion of that circuit. A single 5v rail of the Sproggy should easily give you 1-2A without too much of a heat problem.
    I second that. You could also build a high efficiency switching regulator based on the National Semiconductor Simple Switcher parts. Check out the LM2596 datasheet for a circuit that you can build using a handful of parts.

  10. #10
    Raw Wave rando's Avatar
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    Quote Originally Posted by shchua
    You could also build a high efficiency switching regulator based on the National Semiconductor Simple Switcher parts. Check out the LM2596 datasheet for a circuit that you can build using a handful of parts.
    The 5v rail of the Sproggy IS a simple switching regulator based on National simple switcher parts.

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