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  • I am Testing this Circuit of the Oscillator on a Breadboard and connected the Coil with 1uF Cap,
    but I see the same results of 2V pp at 300Hz :

    Q1=BC327,
    Q2=BC547,
    1M,
    1.8K,
    40R,
    2.7K,
    2.2nF

    Has anybody tested this Circuit on a Breadboard ???
    Whats the Magic to get 16V pp at 1.5KHz ?

    Comment


    • Is the full DD Coil Diameter supposed to be 27cm ?
      - Or is each RX and TX Coils supposed to be 27cm Diameter per (which doubles the full DD Coil Size) ??
      I made each of RX and TX about 25-26cm Diam.

      I just finished a new TX coil exactly 27mm diam with 0.71mm wire of 35 turns,
      Tested on the Circuit, it gives 3V pp at 160Hz without Cap,
      - and No Freq (less than 0.2V pp) with Cap 1uF.

      Comment


      • Originally posted by ampirate View Post
        I am Testing this Circuit of the Oscillator on a Breadboard and connected the Coil with 1uF Cap,
        but I see the same results of 2V pp at 300Hz :

        Q1=BC327,
        Q2=BC547,
        1M,
        1.8K,
        40R,
        2.7K,
        2.2nF

        Has anybody tested this Circuit on a Breadboard ???
        Whats the Magic to get 16V pp at 1.5KHz ?
        my friend you should have scope to see waves .
        TX = 6590hz
        RX= 4680hz
        check these points:
        Click image for larger version

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        Comment


        • TX Oscillator Problem

          This is my circuit quandry with TX Oscillator :

          Click image for larger version

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ID:	340403

          Old Coil gives me 2V pp at 300Hz with 1uF Cap.

          New Coil gives me 3V pp without Cap (no Freq with Cap).
          Coil: 35 Turns at 27mm Diam of 0.7mm Wire.

          - Where is the 16V pp at 6.5KHz across the Coil ???

          OK, Update:

          First, New Coil gives me between 9V-20V on Oscilliscope (which only reads up to 10V).
          But, No Freq with 1uF Cap.

          Second, the Tone disappears to a whisper on the Detector with New Coil,
          no matter how I maneuver or flip the Coil.

          Comment


          • Originally posted by ampirate View Post
            This is my circuit quandry with TX Oscillator :

            [ATTACH]29723[/ATTACH]

            Old Coil gives me 2V pp at 300Hz with 1uF Cap.

            New Coil gives me 3V pp without Cap (no Freq with Cap).
            Coil: 35 Turns at 27mm Diam of 0.7mm Wire.

            - Where is the 16V pp at 6.5KHz across the Coil ???
            my friend you use +9v , why ???
            use +12v and put you results here.you will see 6.5khz in coil connector pin1.

            regards

            Comment


            • Full diameter should be 27cm RX plus TX

              "TX, I used 35 turns of 0.7mm wire on a 27cm Diam Coil - for DD config, Cap=1uF, 1.4 ohms. " does this mean it's twice a big as it should?

              Shape is in the Tesoro TGSL thread

              Comment


              • You are using cut up sockets for the transistors ??

                They may not be connecting..




                If yes..

                Pull Q1


                Measure base of Q2 wrt Batt -Ve terminal

                It should read +0.7volts.



                If its still 0.1V ,, Pull the coil off - if you now get 0.7 - your cap is DC short.



                If still 0.1v either base resisto wrong value or not connected to 8v

                OR

                Q2 is wired bad

                Comment


                • I guess Silverdog is Not supporting IDX Boards anymore.
                  Me and some metal detecting friends have been waiting to order a batch of Kits for a month now.
                  But, they are still Out Of Stock on his Website.
                  We were hoping that he would want the sales - Pity.

                  Comment


                  • IDX will be back - just many things on at the moment
                    I only ran out last week so you should have been able to order recently
                    Do I want the sales ? well I'm not a business just a member, more sales enables more projects/stock but less free evening time - tricky balance

                    Comment


                    • Ok, thanks.
                      I think we have been trying to order a batch since begining of April.
                      - And so instead of waiting, we have been working on our own boards ourselves, but with limited success.

                      When can we order ?
                      Can we place the order, and await the parts ?
                      Can you answer via the email that I just sent ?
                      Thanks !

                      Comment


                      • I have just ordered some boards, they typically take 10-14 days to arrive
                        I'd rather not alter the shop as others may order expecting them to be in stock - if you want to pm me and let me know how many you want we can sort something out

                        No email received recently ?

                        Comment


                        • Silverdog,
                          Have not seen email from you, I am lostam7.
                          * We would like to order (1) IDX PRO KIT and (3) IDX PRO PCB Boards.
                          If you can set that Order please.
                          Thanks, Lostam7.

                          Comment


                          • I aiming to build and experiment with the VDI.
                            But first I need to get the IDX Board functional.

                            Comment


                            • Message left on website.
                              Sorry for confusion.

                              Comment


                              • I still have not received any email from ampirate or lostam7
                                I will reserve 3 pcbs and 1 kit for you when they arrive

                                Originally posted by ampirate View Post
                                Still have not received any email from Silverdog.

                                Comment

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