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M Philbrook

In article , says...

Sometimes there are obvious signs, bulged top or any evidence of
overheating.

But the capacitor can look shiny and new, yet fail the test.

Presumably that's why ESR meters aren't cheap.

I mean can you tell a low ESR capacitor by looking at it, is the ESR
rating on it?

I've never seen it on the component markings - you have to look it up in the
manufacturers catalogue.

Why are some electrolytic caps gold coloured? Does that mean they're better quality?

--
I married my wife for her looks...but not the ones she's been giving me lately!

The problem is not just ESR, you also have induction issues in lytics.

Best practice is to use 105 degree caps and put a disc or cermanic type
cap across the lytic together.

The ceramic has very low L in it so it can grab the sharp edge of the
pulse.

Jamie