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ESR meter upgrades

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    #1001
    Re: ESR meter upgrades

    if anybody makes more, use a 44pin mcu - then you can have 128k flash and not be restricted to 32k.

    Comment

      #1002
      Re: ESR meter upgrades

      Maybe you can try this firmware, it might work with your unit:
      https://yadi.sk/d/yW8xa5NJgUo5z/M328Kit%2BTFT

      There are allot of other pre-compiled firmware for other models there as well...
      "The one who says it cannot be done should never interrupt the one who is doing it."

      Comment

        #1003
        Re: ESR meter upgrades

        yes. it really works, but I liked the STJ software. Thanks. I will do it with the software you recommended!

        Comment

          #1004
          Re: ESR meter upgrades

          The software is not written by STJ, there are basically nowdays two open source versions:
          M-firmware by Markus (username Madires on the eevblog forum)
          K-firmware by Karl-Heinz Kübbeler (username kubi48 on the Mikrocontroller forum)

          Both I and STJ seem to prefer the K-firmware but it is all down to preference.
          You can try both now that you have a place with precompiled firmware that works for your unit.
          Or you can get your hands dirty and compile yourself if you like, there are allot of options to customize
          "The one who says it cannot be done should never interrupt the one who is doing it."

          Comment

            #1005
            Re: ESR meter upgrades

            what makes mine good is i took the time to get all the settings right.
            stuff like display centering, battery level etc is very poor on the default settings from the author.

            Comment

              #1006
              Re: ESR meter upgrades

              STJ, does this unit look like it would work with your firmware?

              They don't show the bottom of the board but I'm assuming it's an 8MHz setup.

              2021 New GM328A Transistor Tester ... W/ Battery Case
              https://www.aliexpress.com/item/1005002426224712.html
              Attached Files
              Last edited by bcstedt; 04-26-2021, 03:10 PM. Reason: Found and image of the backside.

              Comment

                #1007
                Re: ESR meter upgrades

                i have no idea - first time i'v seen that.
                it looks similar to the one we call "AY-AT"

                if your thinking of buying it - dont.
                it has a 32pin cpu - so limited to 32k flash.
                you want one with a 44pin cpu so you can use upto 128k for maximum features.

                Comment

                  #1008
                  Re: ESR meter upgrades

                  Originally posted by stj View Post
                  you want one with a 44pin cpu so you can use upto 128k for maximum features.
                  Thanks for the tip! I will hunt for 44pin units.

                  Wait, so what processor is it? Model #?
                  Last edited by bcstedt; 04-27-2021, 04:15 PM.

                  Comment

                    #1009
                    Re: ESR meter upgrades

                    How widespread are the "44 pin" units? Which specific microcontrollers qualify for these? Seen any specific models with them?

                    Since it seems that there are so many mega328 units out there, wouldn't it make sense to keep trying to use these?

                    Dang. I would rip out the PWM generator code, rather have a dedicated device to generate PWM and not sacrifice this unit to control something. Frequency counter... maybe keep. Signal generator... rip out, same issue/opinion as PWM code. *shrug* again just IMHO...

                    Comment

                      #1010
                      Re: ESR meter upgrades

                      Originally posted by stj View Post
                      i have no idea - first time i'v seen that.
                      it looks similar to the one we call "AY-AT"

                      if your thinking of buying it - dont.
                      it has a 32pin cpu - so limited to 32k flash.
                      you want one with a 44pin cpu so you can use upto 128k for maximum features.
                      Do you have a suggested unit you like? It's time for me to get one of these...

                      Comment

                        #1011
                        Re: ESR meter upgrades

                        oh well pulled trigger on one, unfortunately it's a 32K flash limit, but nevertheless it still should work to test parts even if it cant take latest flash...

                        just hope it knows how to detect germanium transistors/diodes and I couldn't care less if it could PWM or be a frequency generator, I have other tools for those functionalities...

                        Comment

                          #1012
                          Re: ESR meter upgrades

                          well the tc-1 uses a 44pin atmega324,
                          and there is a highland one with an atmega644

                          probably others too

                          Comment

                            #1013
                            Re: ESR meter upgrades

                            speaking of which... can it tell the difference between a Schottky diode vs Germanium?

                            Comment

                              #1014
                              Re: ESR meter upgrades

                              if i had a germanium diode i could tell you

                              Comment

                                #1015
                                Re: ESR meter upgrades

                                hmm... I guess we'll find out regardless, provided it ships...

                                If you're curious now, do you have any germanium transistors and just stick in two terminals?

                                Comment

                                  #1016
                                  Re: ESR meter upgrades

                                  no, not seen one since i was small and had a radio-shack crystal radio kit!!!

                                  Comment

                                    #1017
                                    Re: ESR meter upgrades

                                    I have a bunch of germanium diodes tried out, and not so impressed. Readings seem to be different every run. AY-AT and stj's F/W I think 20MHz:

                                    1N34A 371mV (DMM measures 317mV)
                                    1.6pF--1.2pF @0-5V
                                    Ir=74nA

                                    1N34A 376mV (DMM measures 317mV)
                                    1.8pF--1.2pF @0-5V
                                    Ir=61nA

                                    1N54 848mV (DMM measures 470mV)
                                    27pF--17pF @0-5V
                                    Ir=5.1uA

                                    1N54 846mV (DMM measures 482mV)
                                    11pF--10pF @0-5V
                                    Ir=2.4uA

                                    1N34A 380mV (DMM measures 313mV)
                                    1.7pF--0.72pF @0-5V
                                    Ir=46nA

                                    Comment

                                      #1018
                                      Re: ESR meter upgrades

                                      Hmm so it looks like it might sort of distinguish a germanium compared to a schottky actually... but it can't do it directly at least as of yet...

                                      Comment

                                        #1019
                                        Re: ESR meter upgrades

                                        I think Schottky leakage current is much higher.
                                        I tried a 1N459A silicon low leakage diode and Vf=761mV but no Ir measurement shows up on the display.

                                        Comment

                                          #1020
                                          Re: ESR meter upgrades

                                          https://disk.yandex.ru/d/EWk4K3zB3bKl9w

                                          Hello.I have such Mega328 V 2,68 ESR-T4.

                                          https://de.aliexpress.com/item/10050...3bce0dd330da5b

                                          after the modified firmware I can not go self test at the last stage.as if stuck.for 1 and 3 times I tried a new 223j capacitor. This is the last stage of verification.I have already stitched 30 different firmwares with many firmwares. But alas, I can not pass the test. At the last stage, I did not save my own. It's a pity.

                                          Comment

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