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12v DC to 12V AC

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by sancan1, Feb 3, 2003.

  1. sancan1

    sancan1 New Member

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    Would anyone sell me the schematics to build a transformer to use an AC water pump with my pc case power supply?

    The source is: 12v DC
    water pump: 12v AC 60hz 0.2A

    Someone told me that its easier to use a 110v AC transformer, but I would like to use the 12v DC output (yellow cable) just to make less modifications.


    Thanks.- :D
     
  2. johneppen

    johneppen New Member

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    I think you would have to use another transformer anyway. because if you made a square wave oscillator, 60HZ, amplified it with some mosfets, you would only have 6vac. So you would have to use a step up transformer with a 1:2 ratio. Whoever gave you the advice of just using the 12v transformer from 110vac was right. It would be alot easier. Just remove the transformer and add a fuse, and your good to go.
     
  3. Phasor

    Phasor Member

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    I agree with johneppen - since your PC already has AC going to it, to use a 110V/12V transformer is far simpler than building an inverter, and you will get a better quality wave. The output of a square wave inverter is not much good for driving inductive loads, like motors.

    But be careful, please - incorrect mains wiring = dead PC user :(
     
  4. dave

    Dave New Member

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  5. star882

    star882 New Member

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    Why would you want a water pump in your PC? :?:
    If you mean to use a PC power supply to power the pump, forget it.
    The pump is only 0.2A and 12v, 0.2A transformers aren't that expensive.
    http://www.radioshack.com/product.a...name=CTLG_010_009_003_000&product_id=273-1385
    Here is one transformer for $4 that can handle 12v@0.3A.
     
  6. sancan1

    sancan1 New Member

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    star882:
    I need a water pump in my pc because I'm building a water cooling system. I´ve tested 3 pumps already: One 12vDC and a 12vAC. Both burned out 20 minutes after staring the test. The third one I tested was a 12vAC (Fountain pro - Made in China) that works fine. I thought of a "12vdc to 12vac" transformer as the easiest way to pug it in the system.

    As everyone keeps telling me thay the easiest way is to transform directly from 110VAC, I´ve already installed a 110v/12v transformer that uses a MOC 3041 chip to turn the pump on when I turn the computer on (not using a relay). If anyone needs this diagram, please ask (sancan1@hotmail.com) and I´ll send it.

    Thanks to all for your comments :!:
     
  7. bogdanfirst

    bogdanfirst New Member

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    think of something ....
    BE CAREFUL!!!!!1
    if a drop of water falls on the hot processor you will very probably destroy it.
    and if it falls on a bard .....you think. probably it wouldnt destrouy it but the software will have a ton of errors.
    so back to the circuit. i think that it is batter to use a transformer to drive the pump and the circuit you designed to turn on the pump.
     
  8. star882

    star882 New Member

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    Water and electronics don't mix. :!: :!: :!: :!:
     

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