Using an ATX power supply

tk26:

cr0sh:
The biggest problem with such a supply is the fact that without modification (not an easy task unless you have a schematic for the supply and are an "expert" in power supply design) you can't set a current limit for a given voltage.

I'm wondering about this though, can't I just stick a current limiter in front of the component?

Yeah - you probably could; but at a certain point you're going to end up with a "franken-psu" and will probably spend as much money (in time, if nothing else) building it, and ending up with a less capable device than if you had simple purchased a bench PSU. Then again, you will have likely learned a lot by doing so, so you could factor that in. What is your goal? A power supply for your projects that will be reliable and accurate, and safe; or is it to learn how power supplies work and how to build them?