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12 volt 10 amp — Parallax Forums

12 volt 10 amp

LightfootLightfoot Posts: 228
edited 2006-11-06 19:58 in General Discussion
Where can I find a transformer that has a 120 volt primary and a 12 volt secondary? It has to handle 10 amps on the secondary.

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Well well, I'm seeing things, three of them.

-Stanley Blystone

Comments

  • NewzedNewzed Posts: 2,503
    edited 2006-11-05 01:06
    Stanley, look for a filament transformer at a surplus place or an amateur radio store.

    Sid

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    Sid Weaver
    Don't have VGA?

    Newzed@aol.com
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  • HulkHulk Posts: 68
    edited 2006-11-05 02:55
    I would consider taking the transformer out of an automotive battery charger.·· They mass produce these things so you may not have to pay an arm and a leg for it.

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  • LightfootLightfoot Posts: 228
    edited 2006-11-05 03:34
    Yes I understand what devices have them but what online stores would carry them?

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    Well well, I'm seeing things, three of them.

    -Stanley Blystone
  • Bruce BatesBruce Bates Posts: 3,045
    edited 2006-11-05 09:07
    Stanley -

    This should do it for you:
    http://www.mpja.com/productview.asp?product=7846+TR

    IMHO $18.00 (US) is a decent price for a 120 VAC to 24 VAC C.T. 10 amp transformer. The C.T. (center tap) on the secondary is what permits you to have a 12 VAC output. In series the secondary would be 24 VAC. When placed in parallel your secondary is 12 VAC.

    If you need a simple wiring diagram, let me know.

    Regards,

    Bruce Bates

    Post Edited (Bruce Bates) : 11/5/2006 9:32:32 AM GMT
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2006-11-05 15:42
    Hey, you guys, Stanley Blystone was one of the·character actors in the Three Stooges' shorts, usually playing the part of some tough.
  • Robert KubichekRobert Kubichek Posts: 343
    edited 2006-11-05 17:27
    Bruce Bates said...
    Stanley -

    This should do it for you:
    http://www.mpja.com/productview.asp?product=7846+TR

    IMHO $18.00 (US) is a decent price for a 120 VAC to 24 VAC C.T. 10 amp transformer. The C.T. (center tap) on the secondary is what permits you to have a 12 VAC output. In series the secondary would be 24 VAC. When placed in parallel your secondary is 12 VAC.

    If you need a simple wiring diagram, let me know.

    Regards,

    Bruce Bates

    Sure, but in parallel, you have a total of 20A at 12v if you use a 4 diode full wave rectifier,
    and 10A at 12v if you use a 2 diode bridged-full-wave trectifier.. smile.gif
    Also the output voltage will be higher depending on the load placed on it. shocked.gif

    Bob scool.gif
  • Bruce BatesBruce Bates Posts: 3,045
    edited 2006-11-06 08:59
    Bob -

    And the problem with that is what?

    The transformer exceeds the users ampacity requirement. I've never viewed that as a problem with ANY transformer.

    Regards,

    Bruce Bates

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  • Paul Sr.Paul Sr. Posts: 435
    edited 2006-11-06 14:48
    Three of Them said...
    Where can I find a transformer that has a 120 volt primary and a 12 volt secondary? It has to handle 10 amps on the secondary.

    What is your desired output (rectified, filtered, final voltage)?
  • Robert KubichekRobert Kubichek Posts: 343
    edited 2006-11-06 19:58
    Bruce Bates said...
    Bob -

    And the problem with that is what?

    The transformer exceeds the users ampacity requirement. I've never viewed that as a problem with ANY transformer.

    Regards,

    Bruce Bates

    No problem at all, just wanted to clarify so he could adjust components accordingly.. smilewinkgrin.gif
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