RE: [CAD_CAM_EDM_DRO] Help putting together Power Supply

What voltage are you trying to achieve? What is your maximum current
draw?

Your transformers are center-tapped basically meaning you can configure
them differently. The secondary voltage is determined by the voltage on
the primary times the turns ration. The turns ratio is simply the
number of turns on the primary as compared to number of turns on the
secondary.

You can hook your 110V between the red and black. You can actually use
either top or bottom if you wish. You will then get 12V on the
secondary between the blue and yellow. If you go between the blue and
blue on the secondary, you should have 24V.

It looks like these are rated for 10A on the secondary. If you hook
them in series, you will get more voltage but you will still have to
stay within the 10A current limit.

I have never hooked two transformers in series, so I am not sure of any
potential issues with that. I know some transformers are not completely
isolated between the primary and secondary. Those are called
Autotransformers, I think and you would want to make sure yours are not
like that before hooking them in series.

Also, dealing with AC, you can't simply add the voltages as you need to
take into consideration phase relationship. Might be better to do that
after the filtering and regulation.

Jon

-----Original Message-----
From: logiccooling [mailto:logiccooling@...]
Sent: Monday, May 05, 2003 9:38 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Help putting together Power Supply

I bought all the stuff I need to build my own PS and I think I
understand most of it, but I'm a little unsure about how to hook up
my transformer(s). I bought 2 of these transformers:

http://www.logiccooling.com/images/xform.jpg

I wasn't expecting there to be 3 wires on each side. I want to run
110V, not 220V. Should I just use the 110V and the common on one
side, and the corresponding 12V and common on the output side?

Also, I've got 2 of each part (xformer, rectifier, 27,000 uF caps).
Would it be better to wire 2 completely different power supplies and
then run their outputs in series to get the desired voltage? Or
should I wire the Xformers together internally for the higher voltage?



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