ESR meter circuit

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  • frako
    Member
    • Jan 2011
    • 17
    #1

    ESR meter circuit

    Hello

    Here is an 555 ESR meter circuit I just got working:
    http://koti.mbnet.fi/hsahko/elek/kv/esr/
    Actually it is not a meter in itself but a converter for multimeter.
    It can measure ESR from 1 ohm to about 0.01 ohms or so.
    Attached Files
    Tags: None
    • TheLaw
      Badcaps Veteran
      • Jan 2011
      • 477
      #2
      Re: ESR meter circuit

      Nice!

        Comment

        • frako
          Member
          • Jan 2011
          • 17
          #3
          Re: ESR meter circuit

          I added analog panel meter to it, so it don't need multimeter anymore.

          As you can see from the photo, it still needs some little finishing like a pcb or a case...
          Attached Files

            Comment

            • Bob Parker
              Technician
              • Feb 2007
              • 182
              • Australia
              #4
              Re: ESR meter circuit

              I can't quite understand what IC1B does - it appears to be over-riding the feedback around IC1A..

              Also, the user is expected to peel off the protective plastic film from the display on multimeters, or it becomes all bubbled and gooey....
              It is a good shrubbery. I like the laurels particularly...

                Comment

                • frako
                  Member
                  • Jan 2011
                  • 17
                  #5
                  Re: ESR meter circuit

                  Originally posted by Bob Parker
                  I can't quite understand what IC1B does - it appears to be over-riding the feedback around IC1A..
                  Oops, sorry. It is a drawing mistake, that is because I first build the meter and then afterwards drew the schematic...
                  IC1B just buffers the potentiometer for zero adjust.


                  Also, the user is expected to peel off the protective plastic film from the display on multimeters, or it becomes all bubbled and gooey....
                  No, no, you remove it when it has too much scratches on it and then... TADAA you have like a new display again
                  But indeed it starts to be that time because of those bubles.
                  On mobile phones those films are much better. They last two or three years before the films needs to be removed and never any bubling.
                  Attached Files

                    Comment

                    • Bob Parker
                      Technician
                      • Feb 2007
                      • 182
                      • Australia
                      #6
                      Re: ESR meter circuit

                      Originally posted by frako
                      Oops, sorry. It is a drawing mistake, that is because I first build the meter and then afterwards drew the schematic...
                      IC1B just buffers the potentiometer for zero adjust.
                      Ah, now it looks right. Thanks.

                      Originally posted by frako
                      No, no, you remove it when it has too much scratches on it and then... TADAA you have like a new display again
                      But indeed it starts to be that time because of those bubles.
                      On mobile phones those films are much better. They last two or three years before the films needs to be removed and never any bubling.
                      This is very true. It should not be left there for many years because then it's very hard to remove the film and its glue.
                      It is a good shrubbery. I like the laurels particularly...

                        Comment

                        • frako
                          Member
                          • Jan 2011
                          • 17
                          #7
                          Re: ESR meter circuit

                          Finally got enought time to draw a PCB for the meter and to put it into a box.
                          I used a TSH22 opamp but it needs a pulldown resistor to make IC1B go under 150 mV
                          Attached Files

                            Comment

                            • yo77777
                              New Member
                              • Oct 2012
                              • 2
                              • ITALY
                              #8
                              Re: ESR meter circuit

                              Originally posted by frako
                              Finally got enought time to draw a PCB for the meter and to put it into a box.
                              I used a TSH22 opamp but it needs a pulldown resistor to make IC1B go under 150 mV
                              TSH22 need diferential power supply?

                                Comment

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