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Old 10th July 2002, 09:15 PM   #1
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Question Strange 3legged component in switched mode PSU

I am looking to upgrade a PSU in a peice of digital studio equipment.

It is switched mode, I think (I have no schematic).

On the outputs are strange 3 legged components that look like small dipped polyester caps (bright orange). The markings on the PCB indicate EM1,EM2...etc. What are they?
On the component itself are the numbers....

2239
K 05

I'm curious.....?
Thanks
Marius
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Old 10th July 2002, 09:35 PM   #2
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It is most likely a T-filter. Inside it would have an LC circuit or two inductors and a capactior for EMI suppression. It helps control conductive emissions. This is most likely what it is. Sometimes RF caps have a third lead attached to a shield but this is unlikely here.

BeanZ
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Old 22nd July 2002, 12:34 AM   #3
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I agree, they should be small EMI filters. Do they look like two balls glued together?
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