"J.P." wrote:

On Fri, 06 Jul 2007 08:26:13 -0700, John Larkin
wrote:

On Wed, 04 Jul 2007 08:49:16 -0500, J.P. wrote:

On Wed, 04 Jul 2007 05:24:53 GMT, "Michael A. Terrell"
wrote:

"J.P." wrote:

On Tue, 03 Jul 2007 11:22:41 -0700, John Larkin
wrote:

On Tue, 03 Jul 2007 07:37:11 -0500, J.P. wrote:

http://alytus.auksa.lt/esr/

Bizarre, complex, and doesn't actually measure ESR.

John
Take that up with the inventor


Inventor? Too bad he wasn't a designer.
It does measure ESR and is a viable citcuit. Best look again.Just
because you read some from Eyesore on the RAT group doen't mean it is
true...and disrespecting a well meaning vet doesn't do so much for
your position either...


An Italian veteran?

It's surprising how common schematic plagiarism is.

John
It's surprising how many total assholes stand on quicksand and defend
their position even when proven wrong because they are not man enough
to admit they went off half cocked or in your lover's case - Hanoy
Terril - half pussed...C'ya losers...


Its obvious who the pussy is, jane. That rolled up sock in your pants
and the paintred on facial hair doesn't make you a man.


Once again, your "freind" didn't invent the ESR meter.

Title:Method and apparatus for testing electrolytic capacitors Document
Type and Number:United States Patent 4216424 Link to this
page:http://www.freepatentsonline.com/4216424.html Abstract:An
Equivalent Series Resistance (ESR) measurement device for testing
electrolytic capacitors without removing the test capacitor from the
circuit in which it is being used and without first discharging the test
capacitor prior to testing. A low voltage AC ohmmeter, which operates at
a frequency of approximately 100 KHz, is used as the measurement device
for the in-circuit testing of the ESR and thus as an indication of the
status or usability of the electrolytic capacitor being tested. A
current-blocking capacitor is placed in series with the electrolytic
capacitor being tested to allow in-circuit testing without damaging the
meter since it blocks any DC charge remaining on the test capacitor. A
pair of oppositely poled diodes are coupled in parallel across the
terminals of the meter to protect the meter from surge currents and the
like and a resistor is coupled in parallel with the test capacitor to
provide a discharge path for discharging the series blocking capacitor
when the electrolytic capacitor is removed from testing. The ESR meter
itself is designed with two operational amplifiers forming an oscillator
whose output is relatively immune from fluctuations in supply voltage.
An amplifier network including three operational amplifiers is provided
to amplify the ESR signal to a usable level. A peak-to-peak detector
circuit is used which employs an operational amplifier having a
supplemental feedback resistor which reduces the phase shift at the
output of the operational amplifier to enable the peak detector diodes
to perform their conventional functions. The two outputs of the peak
detector are connected to two DC amplifiers and a conventional meter
movement is driven differentially by the DC amplifiers to provide a
visual readout of the measured ESR of the test capacitor for evaluation
purposes and the like.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida