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ATX PSU help

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Luckydevil:
I'm not seeing the need for the resistor on the power supply in our application. I followed webgeek's link and the guy said he only saw a gain of .2 volts at best.

The system in my cab isn't complete yet, but I have tested it out using the power supplies and amps with absolutely zero problems of them powering down on their own or supplying low voltage.

Those guys are trying to squeeze every last ounce of power out for their applications. Just buy a decent power supply and this shouldn't be neccessary.

USSEnterprise:
Meybe this should be made a sticky post, if it comes up so often

Luckydevil:
http://www.quepublishing.com/articles/article.asp?p=30273&seqNum=6&rl=1

The link above explains it pretty good. From what I read it seems that if your power supply will work without a load on the +5v line then there is no need to add a resitor. In using a power supply for a car stereo amp the load on the +12v is sufficient enough for the amp by itself (assuming it is a decent quality power supply).

Correct me if I am wrong.

webgeek:
The resistor is only needed if a power supply shuts down when it doesn't detect a load across the 5 volt line. I played with a few PS options and it seems like all the higher wattage ones did this. I suspect it's due to the increased heat and fire risk if something goes catastrophically wrong.

There are two parts to the link I listed. One of them shows how to apply a load to keep things running and the other shows how to use two smaller resistors to increase voltage. Unless you really need 12 volts then you can ignore the 2 resistor example.

Luckydevil:
I'm using a pc power supply that supplies 34amps to the +12volt line and has no need for a load on any of the other lines to use the +12volt. Pretty cool looking and has performed great. It's only about $50 shipped also.

http://www.newegg.com/Product/Product.asp?Item=N82E16817182002

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