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From: NSM on 12 Apr 2005 01:11

"Matthew Smith" <usenet2005(a)spam.trace.yp.cx> wrote in message
news:4257840a$1(a)duster.adelaide.on.net...
> Hi All
>
> I'm sure that the Peak unit (and others) discussed recently are very
> nice, but could anyone point me to an open source ESR tester, or at
> least the principles required to build one.
>
> For one, I want to save money but at the same time, I really like to
> make my own kit where practical.

In "PopTronics" (USA) July 2001, pages 25-28 there is a build it yourself
design that uses a few common parts and has full protection. It claims to
test in circuit from 1 uF on up.

You may find copies at larger libraries under "Popular Electronics",
"PopTronics" was a later name.

--
N


From: John Todd on 12 Apr 2005 10:46
On Sat, 09 Apr 2005 16:58:10 +0930, Matthew Smith
<usenet2005(a)spam.trace.yp.cx> wrote:

>Hi All
>
>I'm sure that the Peak unit (and others) discussed recently are very
>nice, but could anyone point me to an open source ESR tester, or at
>least the principles required to build one.
>
>For one, I want to save money but at the same time, I really like to
>make my own kit where practical.
>
>Yes, I could go Google, but sometimes it's nice to get real
>recommendations from real people ;-)
>
>Cheers
>
>Matthew Smith
>South Australia


I used a shunt ohmmeter cct. with the meter signal rectified
and driven by a twin-T osc at 33KHz driving an LM386. Experiment with
series resistor to get the meter range, and calibrate with resistors.
Mine reads 0 to 75 ohms at about two-thirds deflection.
From: Dave on 13 Apr 2005 09:07
I built the Elektor Electronics ESR tester and it's great:

http://www.elektor-electronics.co.uk/default.aspx?tabid=27&year=2002&month=9&art=50741



Matthew Smith <usenet2005(a)spam.trace.yp.cx> wrote in message news:<4257840a$1(a)duster.adelaide.on.net>...
> Hi All
>
> I'm sure that the Peak unit (and others) discussed recently are very
> nice, but could anyone point me to an open source ESR tester, or at
> least the principles required to build one.
>
> For one, I want to save money but at the same time, I really like to
> make my own kit where practical.
>
> Yes, I could go Google, but sometimes it's nice to get real
> recommendations from real people ;-)
>
> Cheers
>
> Matthew Smith
> South Australia
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