Electronics > Repair

What sort of capacitors are these?

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motocoder:
I'm doing some work on a very old Power Designs precision power supply. Among other things, I've been replacing the electrolytic capacitors. However, there are a couple of capacitor types I see in there an for which I am not sure what type they are, and whether they are the kind that degrades over time and may be in need of replacement.

The first type is the large green capacitor in the first picture below. The "+" and "-" on top (partially visible) were drawn by me with a marker, based on the polarity of the voltage across the cap. So don't see those and assume it's polarized; it may or may not be.

The second type of capacitor is the orange cap visible in all of the pictures. I can't see any clear polarity marking on these either, so I wasn't sure.

Thanks

T3sl4co1l:
Probably both film, I've seen those Spragues before but not sure what's inside them really.  The metal case suggests electrolytic, but not the value/rating.  Any other numbers on them?

If they're film, I'd be very surprised they're showing problems.

Tim

Kjelt:

--- Quote from: motocoder on October 16, 2014, 04:43:41 am ---The second type of capacitor is the orange cap visible in all of the pictures. I can't see any clear polarity marking on these either, so I wasn't sure.
--- End quote ---
This might be a bipolar electrolytic capacitor, not sure though.

motocoder:
Thanks for the replies, folks. I ended up blowing that power supply up,this evening, so no point in checking these caps.

David Hess:
They are Sprague 192P series polyester (Mylar) film/foil capacitors making them larger than metalized film capacitors.

http://www.symmetron.ru/datasheet/vishay/passive/42024/192p.pdf

I have a parts drawer full of them.

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