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Old 29th August 2008, 01:31 AM   #1
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Default Transformer with small oil cap?

Today I scrapped two power supplies from an old CNC machine. The transformer is a pretty decent size but it has an unusual feature. There appears to be a separate winding with nothing but a small oil capacitor connected across it. The power supply has a 5v output and split +/-12. Anyone know the reason for the cap?
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Old 29th August 2008, 03:06 AM   #2
star882 is offline star882  United States
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It's probably a ferroresonant transformer.
"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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