Homemade DIY Pirate PI metal detector

[@voidrf]

Coming along nicely

[@kenzingzong6704]

Make sure to watch part 2 that I recently uploaded also :)

[@shanamalo]

Muy bueno tu proyecto, yo arme ya dos detectores, pero no se comparan a este tuyo, deberías hacer un video de como lo desarrollaste seria estupendo. Felicidades!

[@ozarktreasures8044]

Thanks for a very informative video with some nice modifications. I have an interest in the Pirat detector, and I think that the full possibilities of the basic circuit have not been realized. I am intrigued by your search coil design. How was it constructed? What wire gauge did you use, and how many windings did you find to be the best? What frequency are you running the oscillator at? You mentioned the pulse width, are you adjusting the duty cycle of the 555 as well as the frequency? If so, how are you accomplishing this? I can offer one tip, and that is regarding the shielding of the coil. I have found that by winding a 1/2 inch wide strip of aluminum foil around the coil (through the coil itself, not around the diameter) gives an increase in sensitivity and depth. The foil winding needs a 1 inch gap between the two ends to prevent it from becoming a shorted turn. One end is connected to a dedicated ground wire in the cable from the search coil. Soldering to the foil can be tricky, but was accomplished by using a bit of vegetable oil as flux. If this is a project that you have a continuing interest in, I would welcome the opportunity to exchange ideas with you, perhaps through email or messenger. The Pirat is a project that I continue to return to in between other projects.

[@kenzingzong6704]

Thanks for the comment. The coil as shown on the imgur gallery in the video description is 400uH around 2ohm resistive, ~1.5MHz resonant point and around half that with coax attached from cable capacitance. The *spider* coil is around 27 turns, not sure magnet wire diam. but inner diam. of former is 7" and outer a little over 9.5. The wire itself was scrapped from a power supply transformer secondary so out of luck knowing the exact gauge now but most wire I randomly tested that would fit my coil former circumference were within those same tested ranges. I calculated those values by using a frequency generator sweeping the undamped coil until resonance was found on an oscilloscope then calculating its general inductance using a known loading resistor in a similar way with a little aid from my pocket calculator. The later damping resistor in the circuit was found by trial and error until most sensitivity was found with a ruler and coins. I made the oscillator speed variable which is the "Tone" control in the final part 2 video since it has a slight effect on the size of the object being searched for, but more so for the user since a variation in in pitch is useful when outdoors around other noises. The duty cycle of the oscillator is internally adjustable with a trimmer since I found it has a much larger impact on battery life, how hard the coil is driven, and detection range which there is a sweet spot when dialed in so detection distance is best and circuit current draw is practical. I actually did try the foil idea but found it had some drawbacks to the resonant point and inductance and I didn't notice much of a change of sensitivity in my experiments but I will revisit this idea in the future when I make other size search coils as optional ones to use in the field with it. It will be some time before I get back into metal detecting now that winter is arriving here and other indoor projects are taking priority but I am always up for discussing ideas in the comments.

[@ozarktreasures8044]

@@kenzingzong6704 Thanks fir responding! I will use this information in my own experiments.

[@mohamadWWWW]

Thank you very much.. Great and amazing work❤

[@mossabz]

need more details about this Project help me make it through bro thanks

[@الجنديالنومیديكوزین]

Your nime ...nicola kage our ??? Im tomp reiader😇🤑🥵🥵🥵👹🤯