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Old 4th Feb 2007, 5:17 pm   #11
See_Mos
Hexode
 
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Join Date: Nov 2003
Location: Ossett, West Yorkshire, UK.
Posts: 482
Default Re: Testing a transformer for shorted turns

Yep, you are quite right.

I replace all the 'lytics under 47uf and use an ESR tester on the rest. The one published in Elektor a few years back has been worth it's weight in gold!

I then put the lamp in series with the primary supply with a small load on the output to keep them happy. The resistance of the fillament stays low unless there is a problem and helps to prevent the switching transistor failing if there is.

It's not a 100% safeguard but then what is with SMPS

SM
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