I don't have an ESR tester and I'm just curious, guys. Has anyone here measured the ESR of a general purpose capacitor vs that of a low ESR capacitor of the same capacity and rating? Say, those that we encounter in the 1500, 2200 and 2700 ufd ranges?
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Re: How much better is a low ESR cap vs a general purpose cap?
If you are looking for a rule of thumb your are wasting your time.
Caps vary too much.
There are -grades- of low ESR.
Also within a grade ESR varies with can size, not uF.
Low ESR 1500uF vary between 0.110 and 0.005 which is quite a wide range.
A GP 1500uF depending on it's specifics and which low ESR you look at could easily be anywhere from slightly more to 200 times more.
Low ESR doesn't cost much more than GP and is easy to find, so why would anyone buy GP when the application calls for Low ESR?
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
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You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Re: How much better is a low ESR cap vs a general purpose cap?
Like I said, I was just curious.Comment
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Re: How much better is a low ESR cap vs a general purpose cap?
I know but the question is too 'open' to give a reasonable answer.
Too many kinds of 'gp' and too many kinds of low ESR.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Re: How much better is a low ESR cap vs a general purpose cap?
Pretty much any new cap is going to be better than an old bulged or leaking cap of the same value.
The only reason I can think of to use GP caps is due to size constraints. The ESR won't be as low, but should be good enough for most applications. I have used Panasonic NHG caps on the VRM output of an old P3 board where the OST caps it had in it had blown up. That was several years ago and it's still working ok. I don't know what the ESR was on the NHG's, but the computer functions perfectly, so, oh well.
Be sure you get 105c rated caps though.A man convinced against his will is of the same opinion still.Comment
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Re: How much better is a low ESR cap vs a general purpose cap?
I don't intend to use general purpose caps in place of low ESR caps. I was just curious to find out what the ESR of GP caps was, in the capacitance ranges I had specified, that's all.Comment
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