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Updated version of the TreasureLinx Mirage Pulse Induction Detector.
It's been about 40 years since I first started detecting. I also worked on making some detectors way back then - e.g. ETI 1500 and the Sandbank PI. I even used to review some early Minelab detectors for Miners Den in Victoria, Australia before family and work took over.
Since that time I've been longing to build a proper, professional, fully adjustable pulse Induction detector designed for gold and beach/park detecting.
I've just spent the major part of 5 months researching what circuits were now available, and have come up with this beauty. It's a modified TreasureLinx Mirage, derived from Carl Moreland's Hammerhead. Earlier this year, I purchased Sven's last two pcb's for his highly regarded TreasureLinx Mirage PI Ultra Ver 1MDD, and have added more flexibility and functionality in my tailored pcb version.
My design provides the option to use either a Mono coil, DD coil or a Super D coil (like Minelab) (latter two experimental), selectable core transmit frequency switch, small gold and all-metal switch, user-adjustable pulse-width boost switch, user-selectable pre-amp gain switch, auto self-adjusting threshold, pinpoint pause button, and sample delay control etc. It also adopts VCO audio output (i.e. it changes frequency when near a metal target, not volume, as the ear is more sensitive to changes in pitch that changes in volume).
Designing and building my 300uH vacuum formed super-fast search coil was a fun task too. Searching the world for the lowest capacitance, readily available, shielded cable for between the coil and the plug, was also an adventure. Finding the Teflon coated silver search coil wire was much easier.
I've now had pcb's professionally manufactured (double sided, silk screened, pre-drilled etc.), and have them for sale. I have also pulled together a comprehensive parts list, component source recommendations/prices, and fully detailed pcb assembly and calibration instructions (with oscilloscope screen shots), and suggested Takachi project box and hi-res decal graphics for anyone interested in building their own machine(s) - all provided on a DVD. You definitely need access to a dual channel oscilloscope and multi-meter for this build, as it's very finely tuned to the micro-second and milli-volt! It's surprisingly very straight forward though.
I've attached here a copy of my circuit diagram for the tech heads to mull over, as well as a few photos.
Schematic Mirage Ultra MDDSD Ver1.1 SE July 2019.pdf
Elliot
It's been about 40 years since I first started detecting. I also worked on making some detectors way back then - e.g. ETI 1500 and the Sandbank PI. I even used to review some early Minelab detectors for Miners Den in Victoria, Australia before family and work took over.
Since that time I've been longing to build a proper, professional, fully adjustable pulse Induction detector designed for gold and beach/park detecting.
I've just spent the major part of 5 months researching what circuits were now available, and have come up with this beauty. It's a modified TreasureLinx Mirage, derived from Carl Moreland's Hammerhead. Earlier this year, I purchased Sven's last two pcb's for his highly regarded TreasureLinx Mirage PI Ultra Ver 1MDD, and have added more flexibility and functionality in my tailored pcb version.
My design provides the option to use either a Mono coil, DD coil or a Super D coil (like Minelab) (latter two experimental), selectable core transmit frequency switch, small gold and all-metal switch, user-adjustable pulse-width boost switch, user-selectable pre-amp gain switch, auto self-adjusting threshold, pinpoint pause button, and sample delay control etc. It also adopts VCO audio output (i.e. it changes frequency when near a metal target, not volume, as the ear is more sensitive to changes in pitch that changes in volume).
Designing and building my 300uH vacuum formed super-fast search coil was a fun task too. Searching the world for the lowest capacitance, readily available, shielded cable for between the coil and the plug, was also an adventure. Finding the Teflon coated silver search coil wire was much easier.
I've now had pcb's professionally manufactured (double sided, silk screened, pre-drilled etc.), and have them for sale. I have also pulled together a comprehensive parts list, component source recommendations/prices, and fully detailed pcb assembly and calibration instructions (with oscilloscope screen shots), and suggested Takachi project box and hi-res decal graphics for anyone interested in building their own machine(s) - all provided on a DVD. You definitely need access to a dual channel oscilloscope and multi-meter for this build, as it's very finely tuned to the micro-second and milli-volt! It's surprisingly very straight forward though.
I've attached here a copy of my circuit diagram for the tech heads to mull over, as well as a few photos.
Schematic Mirage Ultra MDDSD Ver1.1 SE July 2019.pdf
I'm in Australia)?
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