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  • To 6666

    Many thanks for the link.

    Regards
    Dirceu

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    • Some photos make in the original Baracuda
      Pin2 Q3...First window(2V/20uS)
      U2 pin 6 (2V/20uS)
      output of 5534 (2V/20uS)
      Window 1 DELAY position Zero
      Pin 4 Q4 (2V/ 50uS)
      U2 pin 6 (200mV/10uS)
      Attached Files

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      • More Photos from baracuda original ....see the noise in the last
        Attached Files

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        • You can see the adjustment of the first window with Delay in position Zero and second window

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          • Dirceu

            what coil did you use on your surfmaster ?
            thanks

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            • Got my cuda working. Went with a close to factory spec coil .452uH, 1.31R. So far very pleased with the performance. I will post some results as soon as my testing is completed.


              Nice project Silverdog!!!


              Bob

              Comment


              • Originally posted by 6666 View Post
                Dirceu

                what coil did you use on your surfmaster ?
                thanks
                Hi! 6666


                I'm currently using an oval shaped coil of 26cm/15cm. The wire has Teflon insulation. The shield was made with coal from exhausted batteries and Elmer's glue. The inductance is 145uH and 0.9 ohms of resistance. I mainly use this coil on the beach in the sand as far into the water.

                I have built 3 surfmaster and the long PCB designed by ApBerg is certainly better.


                Best regards
                Dirceu

                Comment


                • Hi Dirceu
                  thanks for info on the coil, great that it works so well for you
                  would you mind explaining a bit more about what

                  "coal from exhausted batteries" means thanks

                  I have some elmers glue

                  Comment


                  • OK my testing is completed. I have found that different spec coils need to be adjusted individually at the 25K pot on the board. I replaced mine with a single turn rather then the supplied multi turn pot. Just works a lot easier for me. My coil is as stated a factory spec 11 inch. Nickels come it strong at 12 inches but can still be heard faintly at 15+. Some of my larger gold rings are seen even further away. Soda can at an easy 30 inches. Sensitivity to small gold jewelry is pretty good but could be better. Coil size probably has something to do with that I'm certain. All other board components are what was supplied by Silverdog.

                    Question..... I did not have to add a damping reisitor at all. Is that the purpose for the 25K pot on the board to tune in different coils. I tried a 2k pot across the coil leads to find the correct damping resistor but my scope pic never changed no matter what setting. Is it possible it is not needed?

                    Also has anyone found a way to drop the delay settings lower instead of the minimun 22us?

                    Bob

                    Comment


                    • Hi Alexis

                      Thanks very much for supplying the scope pics of the original Barracuda waveforms - very helpful, thank you.

                      ApBerg, thank you for all your advice and helpfull suggestions, I have seen now that if the offset is set to high then this is what corrupts the pulse on pin 2, when the offset is lower there is a cleaner shape to the pulse.

                      I have not had time to do much work on the Barracuda at the moment as the tides have been long and so I am busy out on the sands with the SurfPI, but will have another try at tuning it up in a few days time.

                      Regards to all, Jim.

                      Comment


                      • Originally posted by 6666 View Post
                        Hi Dirceu
                        thanks for info on the coil, great that it works so well for you
                        would you mind explaining a bit more about what

                        "coal from exhausted batteries" means thanks

                        I have some elmers glue

                        HI! 6666

                        Well! Here in Brazil there is no sprays for shielding, so I was forced to be manufactured from depleted batteries common type C (medium size). I open the battery and remove the black substance and mix it with white glue for paper until a consistent mass and then applied with a brush ... only this.

                        Make a test on a sheet of paper and let dry after 4 hours measure the resistance


                        Best Regards
                        Dirceu

                        Comment


                        • Originally posted by DIRCEU View Post
                          Hi! 6666
                          I have built 3 surfmaster and the long PCB designed by ApBerg is certainly better.
                          Dirceu
                          Hi,

                          Any opinion about performance/datas between Surfmaster and Baracuda ?
                          Schematics are pretty similar, so normaly it must be similar performance.

                          Somebody already finish Baracuda and have more pictures about the project finish ?
                          Another query, do you think it's a good detector for "standard" use in forest for exemple ?

                          Comment


                          • A few of us have finished the Barracuda and some have reported excellent results. I am still trying to get mine tuned up, it doesn't yet match the performance of my SurfPI, but i expect it will eventually.

                            These are Pulse Induction machines and as such have no discrimination, if used in a forrest you will be digging up a lot of small pieces of iron, you might be better off with a VLF.

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                            • Setting are more minimalist with the Barracuda and i think IMHO it's a really good think !

                              I just need to finish the coil and after i add performances data here ASAP Thanks for all theses informations !

                              Comment


                              • Originally posted by Janou View Post
                                Hi,

                                Any opinion about performance/datas between Surfmaster and Baracuda ?
                                Schematics are pretty similar, so normaly it must be similar performance.

                                Somebody already finish Baracuda and have more pictures about the project finish ?
                                Another query, do you think it's a good detector for "standard" use in forest for exemple ?
                                Hi! Janou

                                I'm still finishing the barracuda. I'll post the results when completed

                                Regards
                                Dirceu

                                Comment

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