On Sunday 28 December 2008, Jim Coleman wrote:
>If you can replace caps, i dont see why one couldnt build one of these.
>Probably turn out cheaper than a commercial unit and be plenty accurate for
>most of us troubleshooting.
>http://ludens.cl/Electron/esr/esr.html
That circuit is similar to the wizard, but 200 mv of a square wave may make
the cap good again. The wizard uses only 50 mv at 100 khz, and having looked
at it on a scope, its a pretty decent sine wave, which makes the reading
easier to translate should you want to figure out what the impedance of a 5
uf cap might be. Using a square wave puts a bit of uncertainty into the mix.
IIRC the Wizard also beeps at 2+ ohms but with my poor ears I don't hear it
well, and IIRC the scale direction is reversed from this one, which is a
shrug. The test leads are on the end of a 3 foot piece of small, flexible
coax, with needle points and gold plated for lower contact resistance.
[...]
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
How many chunks could checkchunk check if checkchunk could check chunks?
-- Alan Cox
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