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Old 31st May 2013, 08:56 PM   #1
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Default Quick primary check pls (diagram)

I called the manufacturer, and got the primary voltages for each wire on this power transformer.
Is my diagram correct for typical 120v/60Hz ? (USA)
(700VA) !!


A) yes.
B) no.
C) no, but try it....you should know this stuff by now.
D) Yes, but after converting the 72v secondaries to DC, you will possibly die a noble death.

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Last edited by redrabbit; 31st May 2013 at 09:02 PM.
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Old 31st May 2013, 09:43 PM   #2
DF96 is offline DF96  England
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Looks OK, provided of course that you have correctly understood what the manufacturer told you and they correctly built the transformer.

Build and use a lamp limiter whenever first trying a new PSU on the mains.
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Old 31st May 2013, 10:22 PM   #3
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I also have an autotransformer, and I'll ramp up the input voltage slowly during a no-load test.
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Old 2nd June 2013, 01:46 PM   #4
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
use a bulb tester.
It protects from damage much better.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 5th July 2013, 06:15 AM   #5
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Thanks AndrewT and DF96, I will.

BTW, This transformer is the "MARK LEVINSON Toroidal Transformer Ultra- Low Noise" found on eBay (US).....so if anyone is wondering the what the primary wires are, these are them. (slide the sheathing down, to see wire colors).
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