Electronics > Beginners

ATX conversion question

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shobo:
i'm planning to do an ATX conversion to make myself the most basic of bench power supply.

The plan is to get a 24 pin extender to breakout the wires and keep the psu untouched.

Since the PSU is a really cheap and i doubt it has multiple rails can the power resistor could be added with an adapter to one of the sata cables with an adapter?

The resistor i plan to add is a 10w to the 5v line.

madires:
Maybe a better option:

cdev:
Those supplies still need a source of voltage to regulate, so teaming up an ATX supply with one of them makes sense.

An ATX supply with give you a bunch of fixed voltages and currents and could be teamed up with one of the DC-DC converter modules to give you a single output with controlled current for prototyping.

That's a good all around solution for a bench.

rstofer:
I'm not sure why you are using the resistor...

Here is a neat way to set up the ATX supply:
https://www.sparkfun.com/products/12867

Notice that the gadget has fuses.  This is important because the ATX has far more current capability than you want to have in a bench supply.  The magic smoke comes out of chips really quick when the power supply doesn't limit the current in any meaningful way.

phil from seattle:
The resistor is there because most (all?) PC power supplies need a minimum load to start.

I agree that current limiting is very important, not just with a beast supply. My dual channel, no-name Chinese bench supply has decent current limiting and I will set it to usually about 2X my max expectation.  Saved my @$$ multiple times. 

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