Tim, power transformers can be tricky. The power rating can vary
tremendously depending on the quality of iron used, regulation,
temperature environment etc. Sounds like you are in over your head. I
suggest you find a transformer with manufacturer's specifications.
Fred Townsend
Tim Johnson wrote:
Hello Group,
Maybe a little off topic but hopfully somebody can help or steer me to
someone who can.
I have a relatively large power transformer I believe was from a
computer related application. It has core dimensions of 1 1/4 x 5 1/4
x 4 3/8 and I am trying to get an idea of it's power rating. I has
three primary taps for 105, 115 and 120 volt operation and 2 secondaries.
One secondary has a centertap with large lugs for a high current 5
volt supply. By stepping up the load over a few hours, I was able to
get the OTHER ONE, WITHOUT a centertap and smaller lugs, to provide
12.38 amps at 26.44 volts, drawing 3 amps input at 120 volts.
By feel it seems to get a little to warm to touch after an about hour.
I'm guessing it's at least 100 degrees f.
The numbers on it are as below but I was unable to find out anything
with them.
ECT-100-115-20
72149-2405A2
How can I determine the capable amperage without overloading it? Also
most of the supplies I have seen use a centertapped winding with a
full bridge. Could I still get the same results by using it without a
centertap and create my own ground reference or is this the wrong
animal to use to build a high power supply? If so, can anyone use it?
Thanks and sorry for the long post
Jim
--
Author: Fred Townsend
INET: [EMAIL PROTECTED]
Fat City Hosting, San Diego, California -- http://www.fatcity.com
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