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panasonic transformer ID help
panasonic transformer ID help
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Old 3rd July 2009, 04:59 AM   #1
bart_dood is offline bart_dood  United States
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Join Date: Dec 2003
Location: Massachusetts
Default panasonic transformer ID help

So I pulled this nice transformer out of an old amplifer years ago and kept it for a nice project. I've pulled it back out and want to use it now, but I can't remember where I put in 120VAC.

I think I've pretty much nailed down the secondary side, there are 3 pegs, the middle one is a center tap. The solid windings are thick for high current.

On the mains side there are 6 pegs. Three of them have thick solid core windings and three are smaller, maybe 18-20AWG?

I'm guessing the three smaller ones are where the 120VAC hooks in, but across them (two outer pins) I read about 3.6 ohms resistance (1.8 ohms per side).
According to ohms law that is 30amps if I connect 120VAC into that, which doesn't seem right?

Do you think this tranny was fed via some current limiting resistors, it seems to be a Panasonic unit, part number "SLT5P291" which comes up on google hits but no schematic.

Any ideas?


P.S. I showed what I think is the secondary in red and the primary in yellow.
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Old 3rd July 2009, 02:12 PM   #2
star882 is offline star882  United States
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Join Date: Mar 2007
It appears that the red is the primary. To check, connect it to 120v through a light bulb. The bulb should not light if the connections are correct. Then check the voltages to verify.
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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