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felezjoo PI(the best pulse induction metal detector that I made until now)

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  • #31
    Hello dear friends
    Today I want to talk a little about the system settings, especially the Sensitivity setting and coil calibrating for best results.
    If you have done the exact assembly and turn on the system without any problem, then, do the LCD contrast settings. And the system starts to work.
    Like the below image
    Click image for larger version

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    In the picture above you see on the screen that displays a summary of system settings.
    The first line of a question mark, indicating the number of VDI.
    And when the system will sense something instead of a question mark, a number from 1 to 99 displayed.
    The letter S stands for sensitivity. And the number after it, the amount of sensitivity that is a number between 1 and 20.
    The letter D stands DELAY and number later also show the amount of manual delay.
    The letter F stands for frequency, and the number after that displays the set frequency.
    The letter p stands for the pulse with. And then also the number it shows.
    Next in line is the dark line represents the balance of the system and if the system is in this case an exclamation point! Show, indicating the presence of holes
    Go out right on the screen, the battery indicator that shows the battery voltage.

    In the following
    In this case, if you press the up button once.
    You can see the number of debug or the number of integration, such as the image below.
    This number can provide information about the type and size of the metal sense to you. Of course, if enough experience in this field, have won.
    Click image for larger version

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    And if you press the up button, for the second time, you have three numbers on the screen, you see, as
    shown below.


    Click image for larger version

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    These numbers are very important. And indicates that, Op-Amp is the original, and system health.
    These numbers, called numbers separate channel.
    To separate operation, properly done, and iron removal be done carefully. Note that these numbers should be close to (300,700,800).

    In the next picture you can see the options in the menu.
    Using the up and down keys, you can switch between options. And using the left and right keys, you can change the desired options.
    Click image for larger version

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    In the next post I will try to pay close examination of menu options, and how to fine-tune these options, explain.

    Comment


    • #32
      Originally posted by 6666 View Post
      I would like to discuss R5 which is 2.2k , I've seen similar ccts, with the resister being as high as 10K such as the Skif PI
      what concerns me a bit is that circuit configuration will dump the 12v onto the gate of the IRF840
      but wont the high value of resistance 2.2k (up to 10K) limit the current into the gate and not fully turn
      the fet on ?
      Unlike bipolar transistors (which are current-driven), MOSFETs are voltage-driven. From the IRF840 datasheet you can readily see that Vgs threshold is 4V (max), which means that it needs to have at least 4V to turn on (and preferably much higher) up to the maximum rating of 20V. From the datasheet graphs, it is clear that Id plateaus at about Vgs=8V. This means that the resistor value of 2k2 is perfectly ok, as this will apply 12V to the gate. MOSFETs have a very high input impedance, and (from the datasheet) it is possible to calculate this value for the IRF840 as being 200M (from Vgs=20V and Igss=+/-100nA). So there is no need to be concerned about gate current. In fact, a value of 10k would work just as well as 2k2.

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      • #33
        hi all
        i ve made sprint layout pcb,if some one want??
        Click image for larger version

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        • #34
          hello nick

          just put them in the message Attachement as zip Container, thanks

          you could add thermal pads on the solder points which are on the massive plain

          Comment


          • #35
            Hello Nick, please give board in format Sprint Layout
            if possible

            Comment


            • #36
              Originally posted by nick holas View Post
              hi all
              i ve made sprint layout pcb,if some one want??
              [ATTACH]33385[/ATTACH]
              Nice work nick.
              If you can ad black-white one .jpg, it would be great.

              Comment


              • #37
                hi all!!!
                hi bernt,it s nice to read you!!!
                i ve corrected the layout with thermal pads ,but don t know how to post file!!!!
                WM6:
                i can give it ,only in bmp format .sprint layout export B/W file only in bmp!!!

                Comment


                • #38
                  BMP is ok for BW. Thanks.

                  Comment


                  • #39
                    On the left side menu choose Save this file as xxx.LAY. And ready

                    Comment


                    • #40
                      hi wm6
                      here s your board :75mmx78.6mm
                      Click image for larger version

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                      • #41
                        hi pluto923
                        thanks for your help ,but in fact ,its for sending files in my reply ,i can join image,video but i can t join sprint layout files!!!

                        Comment


                        • #42
                          Very nice. Thank you nick.

                          Please check this (arrow), cause it could lead to short circuit:


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                          • #43
                            Is there a hex file available for this?

                            Comment


                            • #44
                              Wiltran, look at attachment in 1st post in this thread (started by koohyar).

                              A little retouched nick layout:
                              Attached Files

                              Comment


                              • #45
                                Originally posted by nick holas View Post
                                hi pluto923
                                thanks for your help ,but in fact ,its for sending files in my reply ,i can join image,video but i can t join sprint layout files!!!
                                Compress the file as either zip or rar, and then use Manage Attachments.

                                Comment

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