WANTED: Someone to write an 'Oscilloscopes' tutorial on Detector and Coil tuning, - Willing to pay -

[nonkapo]

Just note that Marty mean both tunning the coil and detector with the osciloscope. And he is ready to pay;-). When there is definitely some info on detector tunning with oscope for the coils i did not see even in other forums.

[dbanner]

I suspect that the reason why there's no tutorial on this subject, is because it is detector specific, in other words one size doesn't fit all. It all depends on the type of metal detector circuit you are constructing and also the type of coil, whether double d, or concentric.
If I'm making TGSL, I follow the tgs thread from the beginning, all info is there.
With White's IDX, the same. Etc,etc.
It would be great if a DVD was provided with kit, giving step by step of construction and coil making and testing using oscilloscope etc. Something like a modern day "Heathkit"
I forgot, DVD now obsolete.

[MartyJ1963]

Thanks guys,,,@Nonkapo and @dbanner...An example is:- DFbowers,,he wrote a brilliant PDF, with scope shots and instructions, on building the TGSL,,,it was well put together and well described and I well respect the time and effort it took him to make/write and then make it available to the Forum for free,,,Top guy Mr Bowers!,,Another Example:- I've just completed my First 'Mirage' PI Build. It was written that it wasn't recommended as a '1st' time build for anyone,,so it made me a little nervous at first whether to build this one yet,,,but,,,I contacted Sven, ordered 2 x pcb's (in case I made a mistake with the 1st) and awaited delivery. Sven kindly provided me with a 'Mirage Parts List' while my boards arrived so I could get everything prepared. My boards arrived along with a DVD with all the necessary files, images and info. Following the 'Very' detailed build file (And very well written and put together) I had no trouble whatsoever in building the detector. Following the 2nd article he provided me with (Calibrating the Mirage) I had no trouble whatsoever in calibrating all the onboard Trimpots/setting 0v and tuning the Mirage to very same test results Sven had calibrated his own detector to. Both articles were very well written, easily understandable and I never even had to re-read any line more than once because he'd written and described the methods so well. My Mirage uses the same 300uh/1.4 Ohms Monocoils as recommended by Sven and detects my sisters very thin small gold ring @ 5.5" with a 5" coil, 7" with a 7" coil and 9" with the 10.5" coil,,,a thick womens wedding band detects at nearly 14" with the 10.5" coil and 10" with the 8.5" coil. Big thanks to Sven by the way for a great detector project and if anyone decides to build one,,go for it,,it's an amazing detector with an amazing build file to follow. So as you can see, following a really good build file and detailed instructions from the start can produce amazing results,,,but,,,even though it helped me tune the detector and produce a very good detector at that, it didn't teach me much about 'What' I was actually doing,,,,This is why I am willing to pay for someone's time and skill in producing a well written article on 'Coil tuning',-Monocoils/DD's/Concentrics with an Oscilloscope. Sorry if I'm driving anyone nuts with this,,,,but I really am desperate to learn this. Thanks. Marty

[waltr]

Guys, also remember that the coil balancing and any scope usage is quit different on a VLF verse a PI detector.

The ITMD book looks good for the basics of scope usage for VLF detectors.

Otherwise, besides general know how of using a scope each VLF detector seems the have subtle differences that can only be in the specific detector's build instructions.

[MartyJ1963]

Hi all,,,,I came across this a few minutes ago,,,,and I just bought the same Oscilloscope that I'm wanting to learn with,,,may interest someone,,,and this guy's asking more or less the same question. Thanks. Marty. https://electronics.stackexchange.co...detector-coils

[MartyJ1963]

Hi all,,,@dbanner,,,I've read Andy Flinds articles numerous times, but yes, without a scope you'll never see things like phase relationship, amongst other important data,,,this is why I seriously want to learn an Oscilloscope and why I'm willing to pay for the right knowledge. There's tons of knowledge out there when it comes to electronics/soldering and using meters and such for measuring but there's next to zero in view of Metal detector coils and oscilloscopes. Thanks. Marty

[jinbiao]

Recently, I made a DD probe for the GPX5000, and it is normal to exclude iron. But no mono coil is stable, I want to know if the pulse detector's DD probe needs to be adjusted to zero. Thank you!

[chafik]

The first thing that you learn in learning electronic is RLC circuit parallel daisy chain you just need a signal generator
and a oscilloscope and also a multimeter and maybe a amp probe for oscilloscope and you start your basic experimentation to see how the coil respond to frequency change I guess there's videos in YouTube (there's some Math you could calculate H C and resonance frequency also you could use iron or gold or any conductive material near to the coil to see the change in response you could also use simulation model to see the response I hope this can help you to start

[MartyJ1963]

Thanks for the info Chafik,,,,,But all I'm after really is a detailed tutorial on where to place the probes, on different detectors, to actually Null and Tune DD/CC coils specific to VLF detectors more so than Mono Coils tuning for P.I's. I do intend learning the Oscilloscope fully as I go along as I've not long since bought a Hantek DSO 5102P to learn on. A friend of mine kindly loaned me his Hantek 6022B whch is a 20mhz device, the 5102p is 100mhz. I know there's a lot involved where learning the Oscilloscope is concerned but at the moment I just want to be able to tune the coils I've made for the VLF Detectors I have already built that I can't yet use. I have 2 x IDX, a TGSL and an IGSL that I'd love to take out in the field and test but I'm stuck at the moment with tuning the coils I've built for them. Thanks, Marty.

[MartyJ1963]

Hi Ivconic,,,,Would you have the time, and be able to write a tutorial on 'your' method of tuning DD's/Concentric coils? I really am desperate to learn how to do this and I am willing to pay for this much wanted favour. I have followed and respected all your posts, projects and the help you have given countless people here on Geotech over the many years and would regard your help, knowledge etc on this subject an honour to learn from. Thanks. Marty