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  • Originally posted by maxfly View Post
    Pot were supplied by silverdog and are linear.
    When I said iron goes first, I meant after coins and pull tops are discriminated. Coins are first to disappear.
    I think the schematic off silverdogs site and other diagrams are correct, at least they mostly correlate.
    Could I be looking at a problem with the Fisher coil? Frequency/phase angle
    Ivconic seemed to get it working, maybe he has some experience with this issue.

    Regards,
    Max
    It sounds like you need to change the RX capacitor to get the correct phase-shift. You'll really need a scope to do this.

    Comment


    • Originally posted by eduardo1979 View Post
      The scheme is correct, the Silver Dog PCB are correct. This detector works well with Whites coils 6000, XLT, etc and with the coils have been constructed DD manually. With solenoid Fisher also works well if properly set the resonance frequency and the phase angle. You have to look for suitable condensers for coil Fisher.
      Thanks Eduardo,

      Again you are dealing with a beginner so may I ask for some definitions and locations on the pcb for solenoid and condenser?

      I have a dual channel scope but can only get one channel working at the moment so here are some shots of the TX and then RX U1/pin 6. Do things look Bad?






      Regards,
      Max

      Comment


      • that didn't work!

        here they are
        Attached Files

        Comment


        • Hi Der Fisherman,

          I have tried all combinations for coil connections and only one combination appears correct.

          Comment


          • Hi Golfnut,

            check out the scope shots and see what you reckon.
            would love to try another coil if i could!

            Max

            Comment


            • Hi Qiaozhi,

              are you refering to the caps in parallel with coil connections (image) or C1?
              I have tried many combos for parallel caps.

              Max
              Attached Files

              Comment


              • Originally posted by maxfly View Post
                Hi Der Fisherman,

                I have tried all combinations for coil connections and only one combination appears correct.
                As I understand it, there will be only one correct connection. Good that you have found it....

                Comment


                • Hi Max - you appear to be transmitting on 24kHz


                  This design is for approx 6.5kHz - Add about 1uF see where you go.

                  When you get Tx right it may get easier.

                  S

                  Comment


                  • on ground

                    I was on ground. IDX is marked nicely. I found it cartridge vagina, old 10 penny ones (30 of his years were Hungarian changes, the forint was so valuable, that 40 pence were a croissant...). That trouble of mine with him, that onto rusty iron gives an off-key mark. For you too?

                    Comment


                    • hi at all,
                      I wonder if I miss a change. idx of beeps. but not as it should. I miss a change? can someone tell me how I set the idx in the beginning right? (i mean the potis)
                      maybe one of the procedure-running.
                      first: switch on
                      secound: ....
                      third: ....
                      etc.....
                      Attached Files

                      Comment


                      • I might have to change R24? 1mohm to 1.5 mohm ? as in the circuit diagram?

                        Comment


                        • Trying to assenble the IDX last night. Some discrepancies on the schematic vs PCB and assenbly photo on post page 23


                          on the assy photo - The Red Speaker wire appears to go to a circular pad - it doesnt.

                          On the schematic, have look I deleted what I dont think is there.

                          plus questions.


                          eg why is what I call the Disc pot a trimmer? (low LHS)
                          Whis is the Pinpoint channell on all the time - just Disc CH goes off for pinpoint on button.
                          etc

                          s

                          Comment


                          • jpg

                            this
                            Attached Files

                            Comment


                            • Hi Golfnut,
                              Thanks for heads up about frequency.
                              That has solved most problems. Legend!
                              I set it up at 6.5khz with 90deg phase angle but found that I couldn't adjust gb anymore so have settled somewhere aroun 7.6khz with 120deg phase. Scope looks heaps cleaner at 6.5khz, maybe I'm missing something in the setup procedure or can adjust a component to bring g. Into range?
                              I too have notice dicrepencies with schematic.
                              Eduardo has suggested to remove vr3 pot and use 1k res. Not sure what it does either.
                              Vr2 is gone but what was its purpose?
                              Anyway I'm getting about 35 cm on a large nickel coin in air at the moment so not terrible.

                              Max

                              Comment


                              • Thanks for help

                                I appreciate all the replies with my issues,

                                Regards,
                                Max

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