Need Help!- I've Got This Transformer, Need Help Please...

[Patrick_M]

Hi Gang,

OK, I remembered that I had this old practice amp in my bedroom
that I don't use any more, and started thinking that maybe I could
use the transformer out if it.

I tested the 2 leads that come out of it and they both put out
12.2 volts each, which is I'm assuming, what I need for my 24
volt controller, right? Isn't that why I hook each of the 12 volt lines
to two inputs of the controller, to come to the 24 volt range?

BTW, that's 12.2 volt AC, not DC power we're talking about here.

Anyway, my electrical tester will only test amperage on the DC side
of things, so I cannot test to see how much amperage the transformer
is putting out.

I've linked to a picture of the transformer if this will help with anything:


Does anyone know if this transformer will work and how I go about
testing the amperage output of this transformer?

Again, I'm sorry if these are stupid questions, but I'm pretty dumb
when it comes to this electric stuff and knowing what I'm talking about.

BTW, the controller package I am using is the HobbyCNC PRO Driver
Board Package. You can see it here if you need more info for what I'm
trying to accomplish here:

http://www.hobbycnc.com/products/hob...oard-packages/

Thanks for any help you can offer,
Patrick

[Al_The_Man]

That appears to be a very small transformer, I would estimate it at around 25va.
The link shows 3 or 4 steppers at 4 amps each.
Well over the apparent rating of your transformer.
Al.

[Patrick_M]

ok, thanks Al.

Patrick

[Megahertz]

You cannot easily measure the current capability of a transformer. What determines the amps on the secondary winding is the load on the transformer. Less ohms load equals more current- more ohms load equals less current (Ohms law). If you you draw too much current out of your secondary winding your winding heats up (too many amps for the gauge wire size on the secondary) and you burn the enamel insulator of the secondary and destroy the transformer. Learn about transformer VA ratings. There might be a label on the transformer with the VA rating.

either way....This transformer does look too small for your needs. I went to a junk yard and found a 24volt battery changer with plenty of amps. It is the kind of changer used to charge golf-cart or forklift batterys. A "Quick-Charge" car battery chager might work. I think you need ~12 amps.