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CHANCE PI CIRCUIT DIAGRAM NEEDED

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  • #31
    there is some kinda a contract between BW and GL... I can not give you a direct link on restricted website here...

    circuit & board also can not be seen?
    WM6 wrote:
    Not in original QED design. You have to redesign all in your own design, different from original QED.

    All this, if you want to publish something here (of course final decision belongs to Doug), otherwise you are free to test, educate yourself and research whatever you have from QED original for yourself.

    We need to know something. There is not known court judgement in QED case (court close this case without judgement, as we know, and left final case solution to both party). If something like a contract between BW and ML exist, this contract obliged both contracting party only. No private contract can oblige third party. Third party are free to accept or reject provisions of such private contract. So no one of us are obliged by BW and ML private contract.

    In case of mentioned contract we are obliged only morally, as BW friends, to not harm his position. We do not undermine BW position, if we use QED related material published, or publicly known as given to third party, before contract date. All material newly revealed after contract date, can harm BW supposed contract position (supposed - cause we do not know contract in whole).

    We need to respect Doug, if he, as close BW friend, refuse to publish any new QED data or further work on original QED material. But no one other forums are obliged by those private contract. They can publish what they know about QED project and what they want, having regard to the legal restrictions in term of IP protection, which mean we are free for research, development and testing (field tests inclusive) QED or any other project or patent in whole for educational and research purposes.

    We are always prohibited from commercialisation other IP rights without explicit consensus of IP owner. This not mean, that someone can not manufacture and sell redesigned PCB, par example, for educational purposes to other members. I hope this will happen soon.

    Comment


    • #32
      Hi KT315

      I lost somewhere your Paypal account, please send me your account address to PM. Thank you.

      I wish to buy your DVD. I know your metal detectors database is most complete on the web and worth to buy. You help with info out of your database many times in past different seekers with very valued infos. So I have no doubt, that your DVD is worth those $5 and is recommended to other MD DIY builders too.

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      • #33
        apologies, I have not been available the last few days

        CHANCE info is here http://fandy.hut2.ru/Chance.htm
        The russian forum is here http://md4u.ru/viewtopic.php?f=5&t=3033
        Use google translate and you will get most of it

        I considered making some more but had very little interest, not enough for the outlay it will cost

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        • #34
          Originally posted by daverave View Post
          will send tomorrow....many thanks.
          Money received. Thank you.

          Chance PCB already sent to your PayPal address by registered airmail.


          Regarding preprogramed PIC and some possibly rare parts, ask silverdog, if he still can supply it.

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          • #35
            Chance is what it is.....CHANCE
            I have had no good results....though some people agree on its performance.

            I cannot cope with constant bbbbeeeeepping on metal items that are not there....Oh well

            Silverdog, dont disagree on not continuing this line of under performing detector.....wise move mate.

            Cheers Sid

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            • #36
              Has anyone got any silverdog chance pi micro processor chips they can sell me....i really want to try and build this detector project.

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              • #37
                Originally posted by sido View Post
                Chance is what it is.....CHANCE
                I have had no good results....though some people agree on its performance.

                I cannot cope with constant bbbbeeeeepping on metal items that are not there....Oh well

                Silverdog, dont disagree on not continuing this line of under performing detector.....wise move mate.

                Cheers Sid

                Just curious about your bad experience with CHANCE...
                What software version did you have in your CHANCE? Did you use the stock 390 ohm coil damping resistor or did you optimize it for the search coil used? Were you able to operate it at a Guard Interval of 10?

                Regards,

                Dan

                Comment


                • #38
                  Originally posted by baum7154 View Post
                  Just curious about your bad experience with CHANCE...
                  What software version did you have in your CHANCE? Did you use the stock 390 ohm coil damping resistor or did you optimize it for the search coil used? Were you able to operate it at a Guard Interval of 10?

                  Regards,

                  Dan
                  One of the early first version issued from Silverdog.

                  Try many coils configurations and did use the 390 Ohm damping resistor and many other values.

                  The detector would beep on its own, either target or no target over coil.

                  Any adjustments made no difference.

                  What I dont like the most out of the Chance is the audio tones....not symetrical and the digital output is no comparison to a true analogue linear output. Further audio enhancement is needed to understand the tones emitted.

                  Just my experience....but maybe the problem lies somewhere else in components??

                  The RF choke to the TX could be my problem as the one I have soldered in place may not be large enough to supply the current needed for the Mosfet?? Correct Inductance but small in physical size...Maybe??

                  Cheers Sid

                  Comment


                  • #39
                    Yes I ran into some similar problems early on with the 0.8.4, & 1.1.0, software. The 1.2.1 version is much better. The 390 ohm damping resistor contributed to improper coil damping and optimizing the damping resistor tames the unwanted beeps down a lot but not entirely. My Chance runs pretty quiet over gold dredge piles even though it is running 'wide open' and at the shortest guard interval. It is notably quieter out in the field, away from noise of the city, even though it is inside a metal shielded case.

                    Do you recall the lowest Guard Interval you could operate at?

                    Regards,

                    Dan

                    Comment


                    • #40
                      One more thing, I did hand wind a toroidal choke with #26 wire to replace the axial lead choke of the original kit. It handles the current requirement much better and is a commonly recommended upgrade/modification to CHANCE.

                      Dan

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                      • #41
                        pls can anyone help !!!! i need a couple of chance pi microprocessor chips....i know hardly anything about programming chips

                        Comment


                        • #42
                          Originally posted by baum7154 View Post

                          Do you recall the lowest Guard Interval you could operate at?

                          Regards,

                          Dan
                          Was unable to set any parameters....Even lowering the sensitivity had no effect.

                          Will try winding me own choke to see if any difference.

                          I kept on getting a constant buzz/pulsing noise every couple of half seconds not from the speaker output but the coil itself and it is the 0.8.4 software from memory.

                          Will revive this project considering some people have some positive results and hopefully a latest programmed chip is available from Silverdog to try.

                          I am confident that it is not Electronic component fault related.

                          I did reduce as much EMI in surronding workbench so that can be eliminated.

                          Thankyou,

                          Regards Sid

                          Comment


                          • #43
                            Originally posted by daverave View Post
                            pls can anyone help !!!! i need a couple of chance pi microprocessor chips....i know hardly anything about programming chips
                            Send a PM to Silverdog Andy and see what he may have available.

                            Regards Sid

                            Comment


                            • #44
                              I am convinced that your detector will operate much better with the V1.2.1 software...there is no comparison between the 0.8.4 software and the 1.2.1 software.

                              What targets do you typically seek with your detector? This will somewhat dictate your coil requirements.

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                              • #45
                                Dave, remember there is some mods for the schematic you have to add, see them on Andy page at bottom http://fandy.hut2.ru/Chance.htm

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