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New tool to find short capacitors on motherboards : shorty with display

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    #16
    Re: New tool to find short capacitors on motherboards : shorty with display

    the shorty original is open sourced, so I really can't make mine a closed design.
    by the way, there is nothing complicated on this design, just add a display and a better adc on a shorty.
    I even reused the same protoboard and box where my original shorty was.
    I only was the first it seems to have this idea and realize it in real.

    I will publish the design on my web site in a few days, the pcb will come later after testing it.

    @stj : the adc is on a 8 pins protoboard, but it is a 6 pins, the last two pins are not connected on the adapter sot23-6 to 8pdip.
    Last edited by kripton2035; 02-19-2021, 09:56 AM.

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      #17
      Re: New tool to find short capacitors on motherboards : shorty with display

      i didnt know sot23-6 fited on those soic boards.
      that's good because i have a load of those adapters.

      infact other than the adc i have it all.
      arduino's, blue-pills, esp8266's, oleds - i keep lots of such stuff!

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        #18
        Re: New tool to find short capacitors on motherboards : shorty with display

        I also changed the aop, from a mcp6041 to a ad8628
        the mcp had too much voltage offset, and I losed a lot of low mΩ resolution with it
        the ad8628 is perfect with 1µV offset.

        not sure you also have the aop in your drawers ?

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          #19
          Re: New tool to find short capacitors on motherboards : shorty with display

          i only have dac's

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            #20
            Re: New tool to find short capacitors on motherboards : shorty with display

            ad8628 is just an op-amp??

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              #21
              Re: New tool to find short capacitors on motherboards : shorty with display

              yes
              https://www.analog.com/en/products/ad8628.html

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                #22
                Re: New tool to find short capacitors on motherboards : shorty with display

                so your using it *with* the mcp?

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                  #23
                  Re: New tool to find short capacitors on motherboards : shorty with display

                  I use the ad8628 in replacement of the original mcp6041 aop
                  and I use a mcp3421 as an adc after the ad8628 and before the arduino.

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                    #24
                    Re: New tool to find short capacitors on motherboards : shorty with display

                    ah - o.k.

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                      #25
                      Re: New tool to find short capacitors on motherboards : shorty with display

                      @kripton2035
                      Came to my mind, though you probably already thought on this, to include a pulse switch, easily accessed from the box exterior, to reset reading to zero.
                      This would become handy whenever one's need to calibrate the probes and more often to exclude some known fixed value while probing.

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                        #26
                        Re: New tool to find short capacitors on motherboards : shorty with display

                        this is what the big red button you can see in the videos is for ! make temporary zero, or permanent zero if you long press it is stored in the arduino eeprom.

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                          #27
                          Re: New tool to find short capacitors on motherboards : shorty with display

                          Originally posted by kripton2035 View Post
                          this is what the big red button you can see in the videos is for ! make temporary zero, or permanent zero if you long press it is stored in the arduino eeprom.
                          Already wondered what that big red button was for...
                          Like I said "though you probably already thought on this"

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                            #28
                            Re: New tool to find short capacitors on motherboards : shorty with display

                            I've published the first draft of schematic and source code of the project. enjoy !
                            http://kripton2035.free.fr/Projects/shorty-display.html

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                              #29
                              Re: New tool to find short capacitors on motherboards : shorty with display

                              thx a lot Kripton2035!!! a lot of beer for you !!!

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                                #30
                                Re: New tool to find short capacitors on motherboards : shorty with display

                                Hi Kripton
                                I would like to build one of these. Which is the correct OLED display that I need? Can you post a link to it on Aliexpress if possible as I find it easiest to order from there.

                                I would be willing to buy one of your PCBs when you have some

                                Cheers
                                Last edited by dicky96; 03-02-2021, 10:55 AM.
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