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  • Specifications Coil King Cobra !!!???

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    • Originally posted by ava_61 View Post
      Specifications Coil King Cobra !!!???
      Look at post №47.

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      • Click image for larger version

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        • ====
          Tesoro concentric
          Tx 1,5 5.7mH 22 ohms
          Rx 3,4 6.2mH 22 ohms
          ====
          ================================================== ==============================
          Tesoro
          Name TX-L TX-R (ohms) TX-fo TX wire RX-L RX-R (ohms) RX-fo RX wire
          --------------------------------------------------------------------------------
          Brown 8" 5.59mH 21.2 --- --- 6.23mH 22.1 --- ---
          White 8" 5.68mH 21.8 --- --- 6.36mH 22.8 --- ---
          White 4" 5.62mH 26.6 --- --- 6.13mH 28.2 --- ---
          uMax 9x8 5.74mH 24.6 --- --- 6.21mH 25.8 --- ---
          uMax 12x10 5.78mH 17.3 --- --- 6.15mH 18.9 --- ---
          DD 11" 5.90mH 19.8 --- --- 5.38mH 18.4 --- ---

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          • reply of Monte

            The Gold Mountain GMT-1650 and the Cobra were

            Posted by: Monte [ Send a Message ]
            Date: October 28, 2015 07:14AM
            the same models with the toggle-selected expanded low/high Discrimination adjustment.

            The King Cobra was different in that it had the Notch Disc. circuitry and lacked the selectable expanding Disc. range.

            In descriptive terms, the King Cobra, a too-close copy of Tesoro circuitry for the Golden Sabre Plus units, also operating at 15 kHz, had the more limited lower Discrimination adjustment. That was before Tesoro went to the ED-120 for a bit lower-end adjustment.

            The Cobra and GMT-1650 had the broad Discrimination that allowed a minimal acceptance, ferrous and non-ferrous, similar to the Tesoro ED180 term for All Metal Acceptance at the minimum Disc. setting. The Cobra/GMT-1650 was one of the best models I ever used for being able to "fine tune" the rejection desired, especially in iron littered old town sites, homesteads, and urban renovation, etc. I was one of the GMT Distributors when they came out and I mentioned the one major thing they goofed on was not adding a Threshold control for the All Metal mode.

            Sadly, Gold Mountain Technologies major errors were really poor marketing decisions combined with irritating Jack Gifford at Tesoro for the circuitry issues. Too many bad moves when they had some models that could have grabbed a certain niche of the market. I wish they were still available, and easily/affordably repairable. Of all the long-gone manufacturers, that is the one model (Cobra or GMT-1650) that I wish I still had on-hand with the smaller coil for dense trash.

            Monte



            "Your EYES ... the only 100% accurate form of Discrimination!"

            Stinkwater Wells
            Just a name that brings back fond memories of old alkali desert favorite sites in Utah, Nevada, and Eastern Oregon. There is no pastime I enjoy more than hunting old sites as best I can, doing research, and helping others learn more about this great hobby.:

            Compass Coin Hustler and Compass 99-B
            (For seminars and occasional use.)

            ... and my 'Ready-to-Hunt' buddies ...
            Makro Racer w/'OOR' DD
            **This space reserved for a Nokta Impact.**
            Teknetics 'Classic' T2 w/5" DD
            **This space reserved for a Teknetics Omega 8500.**
            Tesoro Bandido II and Bandido II µMAX each w/6" Concentric
            Tesoro micro-housed Eldorado w/6" and 8X9 Concentrics
            Tesoro Silver Sabre µMAX w/6" Concentric

            [email protected]
            (503) 481-8147(503) 481-8147

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            • How do Coil

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              • do not ask me more

                many times answered on this matter.
                Cobra was choiced by me TO COVER ALL TESORO models be cause the pcb is looking optimal and perfect, Cobra has 2 tones and NOTCH filter. so all tesoro coils with 6mH RX TX will fit Cobra.
                ====
                Tesoro concentric
                Tx 1,5 5.7mH 22 ohms -- Rx 3,4 6.2mH 22 ohms

                ====
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                TGSL_DD coil.pdf
                TGSL DD Coil Making.pdf

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                • silver sabre - I found in a dutch book of metaldetectors :
                  tx 100 turn of 0.5mm copperwire and a diameter of 200 mm and
                  rx 170 turns of 0.5mm copperwire, diameter 80mm

                  DD_255x137.pdf
                  coplanar_decrypted.pdf

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                  • Schematics covered by King Cobra board:

                    GMT:
                    King Cobra
                    GMT1650
                    Gold Scorpion – most likely, no data
                    Thunder Stick – most likely, no data

                    Tesoro:
                    1980: Deep Search VI, Deep Search IV, Deep Search VII
                    1981: Aztec, Cortes, Amigo
                    1982: Scout, Mayan
                    1983: Inca, Silver Sabre
                    1984: Sabre II, Sabre Supreme, Silver Turtle
                    1985: Golden Sabre, Cutlass
                    1986: Silver Sabre Plus, Eldorado, Royal Sabre
                    1987: Toltec 100
                    1988: Toltec 80, Diablo, 4 Reale, 8 Reale
                    1989: Golden Sabre Plus, Lobo
                    1990: Bandido, Pantera
                    1991: Diablo II, Silver Sabre II, Stingray, Laser B1
                    1992: Cutlass II, Golden Sabre II, Laser B2
                    1993: Bandido II
                    1994: Toltec II, Sidewinder
                    1995: Piranha, Stingray II, Laser B3
                    1996: uMax Bandido, uMax Cutlass, uMax Diablo, uMax Sidewinder, Amigo II
                    1997: Shadow X2, Lobo SuperTRAQ, Laser PowerMax, Bandido II uMax, Silver Sabre uMax
                    1998: Cutlass II uMax
                    1999: Sand Shark, Laser Rapier
                    2000: Conquistador, Compadre, Golden uMax, Tiger Shark
                    2001: Cortes, Conquistador uMax, Eldorado, Euro Sabre, Silver uMax
                    2003: DeLeon, Tejon
                    2004: Cibola, Vaquero

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                    • Do You want to know why was noisy my cobra?

                      Because it is not the original IC kit was used.
                      Instead L308 NE5534
                      Instead LF442CN TL082
                      The NE5534 is too large load will be driven to a negative voltage.
                      The TL082 something strange insensitivity causes. The nearby things do not see but a far things see.
                      Who have problems with noise, try to replace the original type ICs.

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                      • in 7660 ics not the same


                        This Ic-s works fine, the neg voltage is : -6,8 V
                        http://www.aliexpress.com/item/Free-...879620656.html
                        Attached Files

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                        • Hi kt315
                          Can i replaced LM2930-08 with 7808
                          Best regards.

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                          • Hi friends Does anyone have or ready PBC circuit cobra in his hand

                            Thankyou

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                            • Work will also state the full cobra

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                              • Click image for larger version

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