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  • Originally posted by lari View Post
    [ATTACH]11221[/ATTACH]
    Hi.
    First i believe that there is not problem with my Coil!!!!
    Second.... what has the Geb waveform??, and what i can do??
    I see it as good.....

    Comment


    • Hi Geo
      You did a turn phase for DISC and GEB, your ideas
      need to do only for the DISC.

      Comment


      • Originally posted by Magma View Post
        Hi Geo
        You did a turn phase for DISC and GEB, your ideas
        need to do only for the DISC.
        Hi Magma.
        As i remember by a George Payne article, the Geb must be about 2...3 degrees positive compared to the Rx signal.If so, i am OK. But i am not sure!!!!
        Regards

        Comment


        • Finally i found the solution but have another problem.
          I reversed the Tx signal again.... and i made a new calibration of the Phase, Geb and total phase potentiometers and now is ok.
          It full rejects a piece 10cm of ferrite rod, also don't beep at iron and it is good on gold and copper.
          But i lost depth!!!!!
          It detects a 30mm coin at 40cm, no good depth for a 15" coil.
          Yesterday when it was unstable it detected the same coin at 50+cm.....
          Also it detects the soda can at 75cm compared to 1m yesterday.
          Sound is worst ..... when the signal is strong it beeps OK, but when it is a medium or small then it beeps interrupted. Maybe i must replace it with the 555. Also it needed a fine tuning of the coil.
          Maybe tommorrow if i will have free time

          Regards

          Comment


          • Originally posted by Geo View Post
            Finally i found the solution but have another problem.
            I reversed the Tx signal again.... and i made a new calibration of the Phase, Geb and total phase potentiometers and now is ok.
            It full rejects a piece 10cm of ferrite rod, also don't beep at iron and it is good on gold and copper.
            But i lost depth!!!!!
            It detects a 30mm coin at 40cm, no good depth for a 15" coil.
            Yesterday when it was unstable it detected the same coin at 50+cm.....
            Also it detects the soda can at 75cm compared to 1m yesterday.
            Sound is worst ..... when the signal is strong it beeps OK, but when it is a medium or small then it beeps interrupted. Maybe i must replace it with the 555. Also it needed a fine tuning of the coil.
            Maybe tommorrow if i will have free time

            Regards
            Hi,Geo!Everything is OK.This pcb without 555 work as you described.My pcb work so too.I don`t like sound at all.I have finished 555 pcb but not tested yet.My friend has made pcb with 555 and he has big depths and very good sound.I think that 555 is the best variant.

            Comment


            • Originally posted by Geo View Post
              Finally i found the solution but have another problem.
              I reversed the Tx signal again.... and i made a new calibration of the Phase, Geb and total phase potentiometers and now is ok.
              It full rejects a piece 10cm of ferrite rod, also don't beep at iron and it is good on gold and copper.
              But i lost depth!!!!!
              It detects a 30mm coin at 40cm, no good depth for a 15" coil.
              Yesterday when it was unstable it detected the same coin at 50+cm.....
              Also it detects the soda can at 75cm compared to 1m yesterday.
              Sound is worst ..... when the signal is strong it beeps OK, but when it is a medium or small then it beeps interrupted. Maybe i must replace it with the 555. Also it needed a fine tuning of the coil.
              Maybe tommorrow if i will have free time

              Regards
              Hi Geo
              You must change the value of C9, how? I am not
              sure, I think it would be good 6n8. Capacitor and
              potentiometer, which are already added, in this case you should
              remove.

              Comment


              • sinusoida sa 22nf nije vise slomljena , veci domet i stabilnji rad .

                Comment


                • sinusoida sa 22nf nije vise slomljena , veci domet i stabilnji rad .
                  Attached Files

                  Comment


                  • Pravilna sinusoida ,ne vise slomljena .Veci domet ,stabilniji rad.
                    Attached Files

                    Comment


                    • Orbit
                      This can refer to the original coil, or the Blue Max?

                      Comment


                      • ne odnosi se na dd standardnu sondu

                        Comment


                        • Ne odnosi se na dd sondu 27cm

                          Comment


                          • Originally posted by Orbit View Post
                            Ne odnosi se na dd sondu 27cm
                            Translate - Valid for the dd coil 27cm


                            Geo has a problem with his probe blue max, Do you have any idea?

                            Comment


                            • Bluemax has Tx =540uH and Rx = 33mH.
                              Also Tx and Rx are not in phase.

                              Regards

                              Comment


                              • Originally posted by Pompey View Post
                                Hi,Geo!Everything is OK.This pcb without 555 work as you described.My pcb work so too.I don`t like sound at all.I have finished 555 pcb but not tested yet.My friend has made pcb with 555 and he has big depths and very good sound.I think that 555 is the best variant.
                                Try to sort the C26. Sound becomes more good (not 555 version)

                                Comment

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