Joe D. Posted January 3, 2021 Share Posted January 3, 2021 SB, Minelab could take a lesson from you on how to beef up their coil ears! All the parts look great!?? Link to comment Share on other sites More sharing options...
PimentoUK Posted January 3, 2021 Share Posted January 3, 2021 Geotech1 seem to get spammer problems, but their security methods to tackle it made it tougher to register for everyone else. There is this page that may help:https://www.geotech1.com/forums/showthread.php?24472 Link to comment Share on other sites More sharing options...
Mike Haer Posted January 3, 2021 Share Posted January 3, 2021 I love this post! good for you! is this something you are building a 1 off for you or are you thinking about going in business? I have used many metal detectors over the years and for most detecting I prefer a digital metal detector but when it comes to relic hunting in farm fields I prefer analog. In my opinion, after using many metal detectors analog works through the iron better time and time again. A new digital detector will come out and I think it will be the answer, "this one will finally be the one to beat out my old analog metal detectors" but so far it hasn't happened. I would love to have a simple 2 tone analog metal detector, 1 tone for iron another for everything else with a volume control for the iron tone (which could be set up on a pot to determine your own break point) with about 3 different size coils starting with about a 5 inch and going up. Can't wait to see what becomes of this. 3 Link to comment Share on other sites More sharing options...
Sun-Boy Posted January 4, 2021 Author Share Posted January 4, 2021 Thanks Mike, For now I'm only making one, and until I get the coil wound and do some real world testing I'm not sure if it's worth seriously pursuing. I'm a builder/designer, I've worked with magnetic's instruments in the past that gave me the foundation for what I'm doing here. I know the old revision will discriminate well, but I've made some updates to the new revision that are meant to improve the design, hope it works. About the two tone option for ferrous and non ferrous material, I have my design set up to do something similar to that, when I get further down the road I'll be able to elaborate on this feature. A quick question: When I see guys using their machines, they have to be swinging in order to get a signal, is this the case with most VLF detectors? Can you guys give me a quick rundown on some of the machines and how they detect? I ask this because I've set up my machine in a configuration where you don't have to swing to get a signal, it's in constant search mode, kind of like the machines that have the pinpoint mode. -S 2 Link to comment Share on other sites More sharing options...
PimentoUK Posted January 4, 2021 Share Posted January 4, 2021 "A question: When I see guys using their machines, they have to be swinging in order to get a signal, is this the case with most VLF detectors? Can you guys give me a quick rundown on some of the machines and how they detect?" Nearly all commercially available VLF machines are 'motion mode' in operation, except when in 'pinpoint mode'. A few have a 'permanent pinpoint mode' as a feature, such as the Fisher F75. One manufacturer that still makes a range of true non-motion machines is C-Scope in the United Kingdom, the CS1220XD is the flagship of the models: https://www.csmetaldetectors.com/shop/category/non-motion-metal-detectors 1 Link to comment Share on other sites More sharing options...
Sun-Boy Posted January 11, 2021 Author Share Posted January 11, 2021 ....so, when we last left our hero's....we were giving a rundown of some mechanical hardware which I proceeded to put in boxes on my kitchen table.....and not touch since then.... But , I did do some parts soldering on the new board today......only to find out that I'm not as good as I used to be when it comes to putting down LLC packages, (sigh), it was the heart of the power supply. So I decided to put that aside for now and moved on to populating the oscillator, it's a pierce crystal oscillator running at 120KHz, it's then divided down to 60KHz, this is going to be my operating frequency. I also use the divider to give me a good 50 50 duty cycle. It gave me some trouble before I got it running. but it's looking good now. I'm using an older NI Virtual Bench on my laptop for the bench testing/troubleshooting. Sorry for the dark photo, I may replace it later. I experimented with manually placing solderpaste on the board to place the LLC package and only proceeded to make a mess. It's the only one on the board, so I'll just have to wrestle it down. 3 Link to comment Share on other sites More sharing options...
kac Posted January 11, 2021 Share Posted January 11, 2021 Ever consider using a stock coil from someone and adapting it to your machine? Coil housings are usually vacuum formed. I had thought it would be possible to 3d print one though for a 1 off. 1 Link to comment Share on other sites More sharing options...
Sun-Boy Posted January 11, 2021 Author Share Posted January 11, 2021 Hi Kac, There is a little "something" happening in my custom coil that I can't replicate with an off the shelf one, I may experiment with some in the future, but for now I need to use my wiring configuration for my system to work properly. -S 2 Link to comment Share on other sites More sharing options...
kac Posted January 11, 2021 Share Posted January 11, 2021 There is a possibility with off the shelf coils for newer machines that they may use parts inside that make them proprietary to specific machines. Not sure if the older Tesoro compatible coils have that, probably unlikely. Shouldn't be that tough to have a 3d printed coil other than size. Link to comment Share on other sites More sharing options...
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