Large Caps - Any good?

[jkeny]

I managed to "rescue" these caps from an industrial machine.

They are very large but the capacitance & voltages don't seem that high compared to modern day sizes. (CD case in pic to give idea of size)

The first is an LCR 2500uF 350Volt - about the size of two stacked cans of beans and roughly the same diameter - I think this is a polyprop but I can't find anything on the interweb. Any good, do you reckon?

The rest are Mallory elec caps. They are 1100uF 450V & 150V and finally a Plessey 1.5uF 400V poly cap?

I'm thinking of trying the LCR on a PS but would be concerned about strain on the rectifiers at startup.

Whatdaya think? Worth keeping?

[jkeny]

Close-up shot

[analog_sa]

Originally posted by jkeny
The first is an LCR 2500uF 350Volt - about the size of two stacked cans of beans and roughly the same diameter - I think this is a polyprop

Of course it is not a polyprop, it is an electrolytic. These caps can take high ripple currents and that's one of the reasons they are so big. LCR is above average sounding cap ime. You can limit the current with a resistor and switch at startup. A choke input filter will also help.

[mwmkravchenko]

Hi jkeny

The LCR cap was made in May 1990 around 18 years old. If the machine was running there is a possibility it is still good. But if it has been sitting for a while you will need to reform the cap.

Mark

[jkeny]

LCR cap says 36MA (this is not a lot of ripple - if that is what it means) on the cap sleeve & I don't see any + or - terminal symbols or colours on the pins or cap sleeve - this is why i thought it was a film type. How do I know which is pos terminal then?

Mark did you find info on-line on the LCR cap?

What about the Mallory caps - any use holding onto them?

[jkeny]

Sorry, you are right - I found the + symbol on the top of the LCR cap buried under some dust!