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From: robb on 21 Dec 2007 16:19
after diagnosing an old microcontroler board with lots of various
old caps i thought maybe an ESR meter to be a good tool for the
tool box ? yes/no or a better tool for the box

so i googled for some ESR meter plans and settled on this one
.....

http://ludens.cl/Electron/esr/esr.html

could someone comment on this design and whether it appears to be
good/bad ?
are there better plans to build ? are there any improvement mods
that should could be made ?

thanks for any help,
robb


From: Martin Griffith on 21 Dec 2007 16:31
On Fri, 21 Dec 2007 16:19:08 -0500, in sci.electronics.design "robb"
<some(a)where.on.net> wrote:

>after diagnosing an old microcontroler board with lots of various
>old caps i thought maybe an ESR meter to be a good tool for the
>tool box ? yes/no or a better tool for the box
>
>so i googled for some ESR meter plans and settled on this one
>....
>
> http://ludens.cl/Electron/esr/esr.html
>
>could someone comment on this design and whether it appears to be
>good/bad ?
>are there better plans to build ? are there any improvement mods
>that should could be made ?
>
>thanks for any help,
>robb
>
If it's a really old piece of kit , and has electro caps in it, just
replace the lot.
They guys who built it probably didn't know what ESR was in those
days, it's only become obvious with modern smps IC's, needing miniohms
of ESR


martin
From: AJ on 21 Dec 2007 16:32
Bob Parker ESR Meter kits are available ad a reasonable price. Google for
them.
"Martin Griffith" <mart_in_medina(a)ya___.es> wrote in message
news:jqbom35psbel5fh6dko4no0ogkhg0riicu(a)4ax.com...
> On Fri, 21 Dec 2007 16:19:08 -0500, in sci.electronics.design "robb"
> <some(a)where.on.net> wrote:
>
>>after diagnosing an old microcontroler board with lots of various
>>old caps i thought maybe an ESR meter to be a good tool for the
>>tool box ? yes/no or a better tool for the box
>>
>>so i googled for some ESR meter plans and settled on this one
>>....
>>
>> http://ludens.cl/Electron/esr/esr.html
>>
>>could someone comment on this design and whether it appears to be
>>good/bad ?
>>are there better plans to build ? are there any improvement mods
>>that should could be made ?
>>
>>thanks for any help,
>>robb
>>
> If it's a really old piece of kit , and has electro caps in it, just
> replace the lot.
> They guys who built it probably didn't know what ESR was in those
> days, it's only become obvious with modern smps IC's, needing miniohms
> of ESR
>
>
> martin

From: David L. Jones on 21 Dec 2007 16:33
On Dec 22, 8:19 am, "robb" <s...(a)where.on.net> wrote:
> after diagnosing an old microcontroler board with lots of various
> old caps i thought maybe an ESR meter to be a good tool for the
> tool box ? yes/no or a better tool for the box
>
> so i googled for some ESR meter plans and settled on this one
> ....
>
> http://ludens.cl/Electron/esr/esr.html
>
> could someone comment on this design and whether it appears to be
> good/bad ?
> are there better plans to build ? are there any improvement mods
> that should could be made ?
>
> thanks for any help,
> robb

Don't bother with that one, get what everyone else in the industry
has:
http://members.ozemail.com.au/~bobpar/esrmeter.htm

Bob Parker hangs out on the aus.electronics group, so you can ask
questions there.

There is also this one, which even Bob himself has heard good reports
about:
http://www.peakelec.co.uk/acatalog/jz_esr60.html

Dave.
From: robb on 21 Dec 2007 16:43

"Martin Griffith" <mart_in_medina(a)ya___.es> wrote in message
news:jqbom35psbel5fh6dko4no0ogkhg0riicu(a)4ax.com...
> On Fri, 21 Dec 2007 16:19:08 -0500, in sci.electronics.design
"robb"
> <some(a)where.on.net> wrote:
> > after diagnosing an old microcontroler board with lots of
various
> > old caps i thought maybe an ESR meter to be a good tool for
the
> > tool box ? yes/no or a better tool for the box
> >
> > so i googled for some ESR meter plans and settled on this one
> >
> > http://ludens.cl/Electron/esr/esr.html
> >
> >could someone comment on this design and whether it appears to
be
> >good/bad ?
> >
> If it's a really old piece of kit , and has electro caps in it,
just
> replace the lot.
> They guys who built it probably didn't know what ESR was in
those
> days, it's only become obvious with modern smps IC's, needing
miniohms
> of ESR
>
hello martin,
thanks for reply.
i understand your point and i will likely do that
however the trouble as pointed out on that ESR schematic website
is that even brand new caps can have numerous ESR failures. So i
was thinking before i invest all that time changing out all those
caps i should at least test the new caps for ESR failures ?

thanks for the advice,
robb


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