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Digital ESR meter design
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stefan_trekkie:
Hi all.. I will be building up new ESR meter from known design:

http://electronics-diy.com/esr-meter-low-resistance-meter.php

I was gravitating to Jay_Diddy_B's 5 Transistor ESR Meter but the use of analog μA meter in for home use only in my experience.  I have destroyed few analog meters by transporting them with my bicycle on cobblestone or bad streets. The second reason is that big caps have very small ESR even bad ones. The resolution is not so grate below 1 Ω. I work on industrial stuff.

Anyway .. I have ordered the parts. The ICL7107 analog to digital converter + direct drive 3½ digits will be nice with 0.01 resolution .. I have the 7 segment displays and op amps .. And Russian made 555s
Conrad Hoffman:
You might also like to build a bridge for large caps. Simple and rugged. I did one here- http://www.conradhoffman.com/cap_bridge.pdf
stefan_trekkie:
 :palm: something went wrong with my chloride. Even wormed up it does not want to each for 3 hours and start to dissolve the trace cover .
Fail I have  :palm:

Plan B .. Universal board bodge the f*** up on this thing
kripton2035:
in the schematic, Cx is connected with 2 wires only. you will never get 0.01 ohms accuracy with a 2-wires measurement. you need 4-wires.


the elektor esr meter, from 2002, uses most of the same circuits, and has this 4-wires measurement method.
http://kripton2035.free.fr/commercial%20esr/esr-elektor-sept.html


Edit: article is available here : https://elektrotanya.com/esr-meter_elektor-electronics-2002-09_icl7106_by-flemming-jensen_project.pdf/download.html

daisizhou:
look
This one is good, I do n’t know if it is suitable for you
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