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ESR meter - project

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by whiz115, Sep 6, 2007.

  1. whiz115

    whiz115 Member

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    Hi!

    I want to build an ESR meter ...first of all i would like to know if you think
    it's a useful tool and better than capacitometer on checking defected
    capacitors?

    second thing... i need heeelp! i know the basic principles of the way it
    works, but my knowledge aren't enough to design one!

    i prefer to use a wheatstone bridge, i have seen many schematics
    and i think it's more easy to build it that way...i also prefer to use
    the tl084 op-amps which i already have and i can buy a galvanometer
    or use my analog multimeter to read my results! although i would like to listen
    any other opinions on my design as long as it has nothing to do with microcontrolers! i don't have knowledge on such things...i'd like my design to be simple and cost effective and above all to do its job! :D

    ready "examples" are acceptable... ;) :D

    Thanks in advance everyone willing to help me.
     
    Last edited: Sep 6, 2007
  2. ljcox

    ljcox Well-Known Member

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    I designed a simple ESR meter.

    I'll post the circuit if you wish.
     
  3. whiz115

    whiz115 Member

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    Yes please do!
    if it fits my needs i would like the PCB too! :)
    it will be the first time i'm going to etch a PCB.....
     
  4. dave

    Dave New Member

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  5. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    It's almost essential these days, the major cause of faults is low ESR capacitors - with an ESR meter you can easily, and quickly, identify these while still in circuit (mostly!).

    The designs I've seen (and the one I built) don't use a wheatstone bridge, just a simple potential divider. It's also pretty essential that you do the measurements at 100KHz - which is the standard frequency for ESR testing.
     
  6. whiz115

    whiz115 Member

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    that is interesting... if it works good and makes my design more simple
    i would like something like that! :)
     
  7. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    PM me your email address and I'll send you a PDF conversion of the original magazine article.
     
  8. whiz115

    whiz115 Member

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    you got pm...

    i'm still interested on any advices if someone has to add something
    i'm all ears and eyes! :)
     
  9. whiz115

    whiz115 Member

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    hi again... :)

    i have ended up with 2 esr schematics... i'll choose the one which
    i can more easily source components and costs less for me...
    but before that i don't know how to make them PCB...

    probably i'll use PCBexpress does anyone has time to correct
    my try on the design i'm going to build?!
     
  10. whiz115

    whiz115 Member

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    nobody wants to say something? :confused:
    if someone has PCB of an ESR meter i'm still interested.
     
  11. Hero999

    Hero999 Banned

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    Perhaps you should design it yourself?

    This is your project remember.
     
  12. pc88

    pc88 New Member

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    Can you post the designs? I'd be interested in taking a look at them.
     
  13. Hero999

    Hero999 Banned

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    I would assume it's copyrighted.

    Although I would think it's all right as one diagram probably qualifies as fair dealing.
     
  14. whiz115

    whiz115 Member

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    I have found many but some of the designs probably are copyrighted and i don't know which one i can post and which i can't.


    recently i tried to convert one of them into PCB... it's a improvement some guy did...based on a design which belongs to Nuova Elettronica.

    http://www.nuovaelettronica.it/it/kit/index.cfmfb=scheda_kit&ww_articoli_id=16281


    (This is the improvement and not the original which exists on an other forum. The original can also be found online)


    [​IMG]


    and this is my unfinished try on Eagle to convert the above into schematic and then PCB. :( :(

    it's my first time on Eagle it's total mess right? can someone give me instructions what to do?
     

    Attached Files:

  15. ljcox

    ljcox Well-Known Member

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    Sorry, I forgot to post my circuit. Here it is. The .pdf includes a circuit description.

    I made it on a prototyping PCB that I purchased from JayCar.
     

    Attached Files:

    Last edited: Oct 1, 2007
  16. whiz115

    whiz115 Member

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    Thank you ljcox! :)
    guys any comments/advices on my try with Eagle?
     
  17. whiz115

    whiz115 Member

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    nobody has to say anything? :(
    i need directions so i can finish my project...
     
  18. whiz115

    whiz115 Member

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    [​IMG]

    what corrections can i make? how should i build it? what do i do wrong and i created this monster?

    thanks!
     
  19. blueroomelectronics

    blueroomelectronics Well-Known Member

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    The original schematic has alot more parts than your version. Why not just follow the original design?
     
  20. whiz115

    whiz115 Member

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    as i said to a previous post... my try is unfinished...
    i didn't knew if i'm doing it correctly and i got disappointed from the outcome! so i need some advices what to do and how to continue so a can make the PCB layout.
     
  21. blueroomelectronics

    blueroomelectronics Well-Known Member

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    Build it as specified, then try to simplify it. Your version does not even appear close. Why would you not build it like its original design? It's only one IC afterall.
     

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