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Old 5th July 2007, 10:36 AM   #1
olev is offline olev  Estonia
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Default Capacitor voltage rating in dots?

I salvaged some capacitors but I can't find any source on google on how to determine the voltage ratings based on the dots seen on the picture. The upper one is 250V, is it too much to use in a gainclone (250V is a real overkill for 20V use)? The 0.22uF one has accuracy rating in dots too?
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Old 5th July 2007, 10:45 AM   #2
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You won't find any small caps like that rated at less than 40V, so they will be fine for a Gainclone.
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Old 5th July 2007, 01:55 PM   #3
olev is offline olev  Estonia
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Ok that's a good generalization, but no real definition for the dots? Is the 0.22uF little red one OK for audio use (the 0.1uF one will go to power chain only)?
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Old 6th July 2007, 04:00 AM   #4
mzzj is offline mzzj  Finland
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Red ones are old soviet union caps perhaps?
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Old 6th July 2007, 04:35 AM   #5
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My guess is the the other caps are max 63 V, possibly lower. The tolerance is 10 or 20%, no precision.
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Old 6th July 2007, 04:40 AM   #6
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I've used both of those red/brown colored types in audio circuits with good results.
I usually scavenge them from old PC boards and stuff.
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Old 6th July 2007, 07:00 AM   #7
olev is offline olev  Estonia
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They are from an old display. Why I'm asking is because the 0.1uF one is larger than 0.22uF, so the 0.22uF should have some really low voltage rating.
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Old 6th July 2007, 08:27 AM   #8
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Not necessarily. Depends on the type and quality of construction.

Just use them, they will all be more than enough voltage for a chip amp
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Old 7th July 2007, 07:40 PM   #9
olev is offline olev  Estonia
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And another question, is there some way to tell by their look if they are polyester or polypropylene?
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Old 9th July 2007, 07:41 AM   #10
glennb is offline glennb  Australia
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Quote:
Originally posted by olev
And another question, is there some way to tell by their look if they are polyester or polypropylene?
No, though polypropylene are usually coded MKP, KP or PP.

"metallised" polyester are usually coded MKT or KT. Ordinary polyester caps are usually uncoded.

http://www.electronics2000.co.uk/dat...f/capmarks.htm has useful information.

Your salvaged caps all look like ordinary polyester. The orange 104J is probably 100nF 100V. The orange 224 is probably 220nF 63V.
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