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Metal detector with meter discriminating

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  • #46
    When I search for capacitators in shops and they ask me "in which voltage range???"what shell I answer???
    please help me I am realy a noob!!!
    Thanks

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    • #47
      Hi

      Hi,have anyone finish this PCB?

      Comment


      • #48
        Originally posted by Unregistered View Post
        When I search for capacitators in shops and they ask me "in which voltage range???"what shell I answer???
        please help me I am realy a noob!!!
        Thanks
        Any voltage rating that is Greater than the Battery Voltage shoud be OK.

        Comment


        • #49
          Polarized capacitators-16-25 volts.
          No polarized capacitors-63-100volts.

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          • #50
            to SASHO-bg

            Hello,
            Thanks for fast replys!
            Sasho can you tell me R42 is?k,m or?????

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            • #51
              to SASHO-bg

              And the potentiomters are?Lin. or Log.?

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              • #52
                to SASHO

                Hello,
                Can I use LM358D insted of Im358?
                Sorry for the stupid question,but you will HElp me this way!
                Thanks



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                • #53
                  The potentiomters are Lin.
                  LM358D-no problem.

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                  • #54
                    to SASHO

                    Thanks!
                    And what about R42?I should chouse right range to achive 9V according to what have I put together or what?
                    I have trying to make PCB for this circuit whit sprint layout 4 ,because I cant find to download sprint layout 5!!!
                    And almost finish,but still a lot of work on this!!
                    I cant wait to test the finished machine!!!
                    Can you tell me about the coil:
                    This is OO coil?
                    And as far I can see there is no switches ot this circuit,except S1 on/off??
                    Thats good I hate switches.


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                    • #55
                      ?

                      Yes,
                      Sasho please explain R42?
                      Thanks

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                      • #56
                        R42-adj.+9v with trimmer 22k.

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                        • #57
                          to SASHO

                          Hello,
                          I mean isnt R42 resistor?What is it's value,because its not marked on the schematic!
                          Tks!

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                          • #58
                            Select the value of the resistense of R42 bey trimmer so,that yon can have +9V on the exit on the stabilizer.Set the neherest pesistor nominal.

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                            • #59
                              to SASHO

                              Hi,
                              SASHO!
                              Thanks.Now you make it clear!

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                              • #60
                                Hello,
                                Can you please tell a little bit more about this coil?How should I conect it with the detector?
                                How you make TX coil with 3 outputs?
                                Thanks

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