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powerr supply to control two stepper motors, where can i find such a beast ?

Hello everybody,

I am in the middle of Texas and I need some wizard on the electrical side of things to guide me. I need to have two stepper motors controlled by a computer by the end of next week.

Motor rating voltage/amps : 2.48 V, 4 A

power supply needed: 5 V, 8 A per motor.

current limiting resistor: 0.63 Ohms.

In order to control the two motors we need a power supply fast as well as the irght current limiting resistors that can do the job. I am thinking of buying a bunch of 5 V power supplies from radio shack and put them in parallel in order to reach the right amps level.

Any other ideas, as to where we can get a power supply on the net, near houston, austin or college station ?

thanks in advance for any tip,

Jake.

Reply to
Newbie
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Have you thought about using a computer PSU and its hefty 5v power line? These are generally heaps cheaper than standard xformers, have over load protection* etc. and so long as some minimum load is there should go 100%. More modern PSU's also have a 3.3v line. You also get the 12 volts as a freebee!

*Obviously you can pick the features you want, but be aware that the cheaper PSU's are often overrated (read the label on the side carefully) and no-name brands often have a high failure rate. You may be best to pull a known good PSU out of an old computer...

Modern (ATX) PSU's (300 watts to over 550 watts) (20 pins in 1 block, or 24 pins for the very latest types) have a Power OK signal which needs to go to ground the turn the PSU on. Older AT PSU's have 2 x sets of pins in 2 blocks - they also tend to have much lower ratings IE 230 watts was a common 'large' PSU for AT.

16A? No sweat.

Reply to
Mercury

Mercury,

I followed your advice on the PSU, it works beautifully, thanks for the tip.

Jake.

Mercury wrote:

electrical

Reply to
Newbie

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