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  1. Replies
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    I replaced this inverter with one I salvaged out...

    I replaced this inverter with one I salvaged out of an old scanner. I think it was an HP, but the chips inside were marked Umax. The scanner accepted 12 Volts DC so I figured the inverter board would...
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    Thanks, That looks like it should do the trick....

    Thanks,
    That looks like it should do the trick. I'll wait and see what kind of luck you have then order one myself.

    Walt
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    13,890

    Backlight Inverter

    http://www.safossils.com/inverter.jpg
    Anyone know where I can get an inverter like this, or a generic replacement? Its from a 7" polaroid electronics dvd player, and the screen appears to be a...
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    6,640

    This is because the harmonics associated with a...

    This is because the harmonics associated with a non sinusoidal inverter represent wasted energy. They have to be dissipated somewhere. If you can afford an Inverter with a sinusoidal output, buy it....
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    Actually, a modified sinewave inverter puts out...

    Actually, a modified sinewave inverter puts out something more like a square wave. A square wave contains a base frequency of 60 Hz and multiple odd harmonics. It' these harmonics that cause problems...
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    876

    I'll have to recsend my offer due to the fact...

    I'll have to recsend my offer due to the fact that I did some more testing with load resistors and fried the 12 Volt section. Appearently it's not as robust as I thought. It burnt up with a 5 0hm...
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    First to PM me with a shipping address gets it. ...

    First to PM me with a shipping address gets it.

    Walt
  8. Replies
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    876

    Great, PM me with your shipping address, and I'll...

    Great, PM me with your shipping address, and I'll get it out to you. If you could provide some info on what you'll be powering with it, that would be helpful too.

    Best,
    Walt
  9. Replies
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    876

    Beta tester needed....

    I have an extra home built ATX supply that I would like someone to test on a higher power system, PIII or P4 standard ATX. I have built another supply, in my custom case, and no longer need this one...
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    6,989

    From my experience, you should be able to short...

    From my experience, you should be able to short the green wire on your ATX power connector (I'm making an assumtion there) to ground (the black wire next to the green), and the power supply will come...
  11. Thread: capacitors

    by waltsongs
    Replies
    9
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    763

    $6.00 for a cap this size sounds about right to...

    $6.00 for a cap this size sounds about right to me. Motor Start/Run Capacitors are very large and expensive. They are also very robust due to the vibrations and harsh environment they must endure.
    ...
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    There are adapters available for most laptops to...

    There are adapters available for most laptops to plug into a cigarette lighter. You'd be better off with one of them as some folks have experienced noise using a laptop with an inverter. If you go...
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    Could be for some motherboards. It's easily...

    Could be for some motherboards. It's easily checked by removing the power good from the 5 volts, then reconnecting it when the supplies are up. Your board should post if that is the problem.

    Walt
  14. Replies
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    9,878

    If you measure your rails under a load and they...

    If you measure your rails under a load and they are fine, check your power okay signal. It must toggle from low to high after all the supplies are up. A cap and a resistor is generally all it takes....
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    858

    From your description, it sounds like there is...

    From your description, it sounds like there is noise on the ground wire to your laptop. Most likely the audio outputs on your laptop have the outer conductor connected to the Laptop's Chassis Ground....
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    100 Amps at 12 Volts = 1.2 KW of power. I doubt...

    100 Amps at 12 Volts = 1.2 KW of power. I doubt that you'll ever really pull that much juice, even on the loudest of bass booms. The voice coil in your speakers are not wound with #4 cable. I think...
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    Does the whine you hear sound like alternator...

    Does the whine you hear sound like alternator noise, or switch noise (Alternator noise will change pitch when the engine is rev'd)? Are you using shielded cable for your audio cables. You might try...
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    L3 is wound on a smaller inductor core removed...

    L3 is wound on a smaller inductor core removed from an old AT supply. I believe it is the transformer that normally couples the Controller outputs to the Primary switchers. It's pretty small and...
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    That's definately a novel and different approach....

    That's definately a novel and different approach. I'm afraid it's just not practical though. Meter movements are very sensitive mechanical devices, supported by jewelled bearings and two coil springs...
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    You realize you will be pulling 25 Amps through...

    You realize you will be pulling 25 Amps through the primary windings (assuming 100% efficiency). It will have to be a specialized transformer indeed! It can be done, but you'll be dealing with very...
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    Cool! If you decide to attempt a build let me...

    Cool! If you decide to attempt a build let me know, I'll be happy to help you along as best I can. The supply posted is actually the second ATX supply I've built like this so I'm quite certain the...
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    If you could find equivalent machine wound...

    If you could find equivalent machine wound magnetics, it might help a little. The coils I wound were a little loose, and they make a little noise. Not enough to be an issue for me. It sounds a bit...
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    I've been using this system regularly for close...

    I've been using this system regularly for close to a year now, mostly during my lunch hour at work. I have set it up in the field a few times to preview fossil pictures. It has survived a lot of...
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    . The rating on your supply is a max rating...

    .

    The rating on your supply is a max rating the supply will deliver, not what your system will draw. You need to calculate amount of power your system will require, and see if it is less the 150...
  25. Thread: Sanity Check

    by waltsongs
    Replies
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    2,933

    The power dissapated by a linear device is equal...

    The power dissapated by a linear device is equal to the voltage drop across the regulator times the load current. If you are going to supply 5 volts at 6 amps, your equation is (12.6-5)*6, or roughly...
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