About to buy a new power supply, Opinions?

[webtek23]

I have been doing some research over the past week and I have decided to go ebay hunting for a suitable power supply for the machine I am building. My machine will have between 5-6 stepper motors (may upgrade down the road) each with a maximum current of 2Amps. So to be safe, I am looking for a power supply with at least 12Amps. My stepper motor drivers are a3982's and have a maximum supply voltage of 35V. So I have been looking for power supplies with a voltage as close to 35V as I can find without going over and a current of at least 12Amps. I am also on a VERY TIGHT budget so finding a suitable supply at the lowest price is very important. Here are a few I have identified.

27V 13A 350W: http://cgi.ebay.com/ws/eBayISAPI.dll...#ht_3527wt_889

24V 10A 240W (a little under max current, i know): http://cgi.ebay.com/ws/eBayISAPI.dll...#ht_500wt_1081

30V 10A 300W (again, a little on the small side): http://cgi.ebay.com/ws/eBayISAPI.dll...#ht_500wt_1081

Probotix also has a inexpensive 32V 10A linear: http://www.probotix.com/power_supplies

So as far as I can tell the first supply would fit my needs and seems to be very economical. I am getting pretty close to purchasing it so I would love to hear anyone's opinions on my selections or even see if anyone else knows of a suitable power supply for less than the top one ($39.99). Thanks!

[kasari]

The best and cheapest way to is to make your own.

This can be done with a old microwave transformer or a store bought transformer, bridge rectifier, a capacitor, and some wire.

You can wind it yourself and safely get the voltage and current you need.

Kasari

Let me know if I can help.

[webtek23]

I considered making one myself as I do a pretty good amount of DIY electronics, but I wasn't convinced that I could make one for cheaper than the units I was finding on ebay. A good transformer is going to cost around $40, right? And a few appropriately sized capacitors could be $10 a piece as well. I would love to see an example parts list if you think making one would be cheaper and that I would still be able to get the desired voltage and current.

For reference I have been looking at a 17V 10A diy power supply tutorial from Elektor magazine that someone else linked to on these forums, but after finding some of the required materials (specifically the transformer), the price was above that of the units I linked to in my earlier post.