Where can I get 3.3v AC adapters?

Discussion in 'General Hardware' started by vern, Aug 18, 2003.

  1. vern

    vern Dominus Political User Folding Team

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    I bought a 3.3 megapixel Vivitar digital camera ... http://www.vivitar.com/Products/DigCams/3mpdsc.html#V3715. It works great ... but it didn't come with an AC adapter. It requires a 3.3v AC adapter. I bought a multiple voltage AC adapter, but the closest it had was 3.0 volts ... which didn't work. I bought the camera at Wal-Mart they don't seem to have an AC adapter for it. Target doesn't have it and looking around on the Internet is no good. Vivitar doesn't sell 3.3v AC adapters either. I might try out Radio Shack, but I might as well ask here also and see if anyone could point me out to a 3.3v AC adapter
     
  2. scriptasylum

    scriptasylum Moderator

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    You'd think Vivitar would at least offer an optional adapter. :rolleyes:

    If you or anyone you know is decent with electronics, you can take a 5v or so "wallwart", take the transformer and rectifier/filter circuits out, and add an LM317T 3-pin regulator, and then stick all that in a small radio shack project box. Depending on how you configure the LM317T, it is adjustable from 1.2v up to whatever your source voltage is (max of 40v differential), but you want 3.3v obviously. You want a source voltage as close to ~4v (but no lower) you can find or the heat from the dissipated power on the regulator will require a heatsink.

    Or, you can modify the regulator circuit of the adjustable one you have so it outputs 3.3v instead of 3v, providing you can take it apart without wrecking it.

    In the meantime, you can use your computer's (or an old small PS) 3.3v line. :)

    In either case, or if you find an adaptor somewhere, be sure to verify the polarity!
     
  3. LeeJend

    LeeJend Moderator

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    Ok, that is the sickest thing I have ever seen. The manual recommends using an AC adapter to upload the pictures and they don't offer one or give any requirements.

    WTF didn't they just get power from the USB adapter...

    Try radio shack. The multi voltage unit I have has a reversible ground, unfortunately it's 3.0 or 4.5Vdc. Shame Vivitar doesn't mention if you need positive or negative ground. THE DAMN MORONS!

    Are you sure the 3.0V didn't work because the gnd was reversed?

    I'd be thinking homebrew off the computer 3.3 volts but it's not on the PS expansion cables and messing with the MB is a bad idea.
     
  4. Gus K

    Gus K NTFS abuser

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    I must have missed something. The lit says it runs on 2AA batteries. That's about 3V DC. Why not just get a charger and a 4 pack of NiMH batteries?
     
  5. scriptasylum

    scriptasylum Moderator

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    Yeah, but those batteries need a slightly higher voltage to charge them. ;)
     
  6. vern

    vern Dominus Political User Folding Team

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    scriptasylum, thanks for the suggestion ... I'll see if I can get anyone to follow your directions because I don't understand a bit. Maybe someone with a bit of electrical know-how.

    LeeJend, yup 3v doesn't work ... on both negative or positive.

    GusK, as scriptasylum says, I bought a 3v DC out ... it's easy to find adapters that output 3v DC ... but I have yet found one that outputs 3.3v because it doesnt seem to charge the two AA batteries I already bought.

    Another solution might be to buy a separate kit that charges AA batteries. Do those exist?
     
  7. damnyank

    damnyank I WILL NOT FORGET 911

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  8. scriptasylum

    scriptasylum Moderator

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    :SLAPS HEAD: Yeah, a battery charger does exist! I was just thinking about how to create a power supply of some sort... man, what tunnel-vision I have. :)

    I've seen RadioShack (as well as most dept stores) sell a kit with 2 AA size Ni-MH recharchable batteries with a charger for less or equal money than the adaptor alone will run you. This means you'll have to pull the batteries out to charge them, but the upside to that is you can get a few spares and have them ready in case one set dies.
     
  9. Taurus

    Taurus hardware monkey

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    if the camera is like most out there, plugging an ac adapter into it won't charge the batteries. it's only meant to be used to save battery usage during file transfers.