field test unit no 001 "model T"

[ApBerg]

There is some nice info in the book from the Hollos brothers....but for the signal processing you need to bay some expencive 'tools

Also some info http://alexmumm.de/pgProtonMagnetometer_de.htm

Best regards

Ap

[gadgetmaker]

Eric,

Thanks for the info; picked up both "Seeing Beneath the soil" and "How to build a precision Proton Magnetometer" for $30.

Will study them....

Karl

[Aziz]

There is some nice info in the book from the Hollos brothers....but for the signal processing you need to bay some expencive 'tools

Also some info http://alexmumm.de/pgProtonMagnetometer_de.htm

Best regards

Ap

That's really a nice info site. Thanks.
Aziz

[vbeeeks]

hi

This exp. is supposedly in critical phase, moodz -, pls do not flame me, my intro - I am yet to put together a decent setup to start md - and where do I go ??? I thought to start on with dspic4012 then 4011 came then Pic32 - frustratedly the similar happened when BW put up 12-24-64 bit sampling on ATmega644 then 'blink' Aduc845 --- I an not able to match the speed of guru's here. Any way I feel the hang between ltspice then breadboarding. Recently BW released dspic33 based schematic then I felt this the ultimate to gift myself in 2013 - my dream shattered when I saw 32bit usb soundcard (Aziz's) based design for pc or cheapo android tablet.Can anyone say for sure whether Adcu845 24bit (lying around) based md has any decent chance to fit the bill as effective platform that will work. I am far behind u guys to even comment on the progress. By the way even coil building I am not able to choose -- how does induction heater induce heat only steel and not aluminum utensils? Is it discrimination?

[WM6]

By the way even coil building I am not able to choose -- how does induction heater induce heat only steel and not aluminum utensils? Is it discrimination?

Yes, it is about magnetic "discrimination". Like magnet attract Ferro (iron, steel) and not aluminium. Magnet build static magnetic field around. Static magnetic field is not able to heat steel it can only magnetise steel located in those field.

Induction heater use changing magnetic field that is trying to magnetise steel very quick in different directions. Iron opposes to this quick changes in magnetisation and this resisting effect cause heating in Iron (steel).

At the same time not same effect in aluminium (copper, etc.) because Alu cannot be magnetised and there is nothing to resist.

[vbeeeks]

1-coils-energy Tx- Rx

Thanks WM6, so I am into "Coils" section, thanks maybe there is to start my quest - as heart of md is this typical sensor - (ground loop sensitivity, common mode, bifiliar, litz recoil, ohm, micro-farad, micro-henry, impedance, ground antenna, radar, energy beam concentration, back-emf, ground-reflectance, window of opportunity and all other dream voodoo has to be deciphered and mastered). I thought this proven induction heater spiral litz winding will give me more window of opportunity and phase lock, lets see. ---->

[moodz]

This exp. is supposedly in critical phase, moodz -, pls do not flame me, my intro - I am yet to put together a decent setup to start md - and where do I go ??? I thought to start on with dspic4012 then 4011 came then Pic32 - frustratedly the similar happened when BW put up 12-24-64 bit sampling on ATmega644 then 'blink' Aduc845 --- I an not able to match the speed of guru's here. Any way I feel the hang between ltspice then breadboarding. Recently BW released dspic33 based schematic then I felt this the ultimate to gift myself in 2013 - my dream shattered when I saw 32bit usb soundcard (Aziz's) based design for pc or cheapo android tablet.Can anyone say for sure whether Adcu845 24bit (lying around) based md has any decent chance to fit the bill as effective platform that will work. I am far behind u guys to even comment on the progress. By the way even coil building I am not able to choose -- how does induction heater induce heat only steel and not aluminum utensils? Is it discrimination?

Hi vbeeeks you observe correctly ... The guru threads are not very productive for finished projects because the gurus cannot resist continuous improvement cycle which is not good for Delivery target dates of finished projects. The BW schematic is a true gift ( hint .... Why would a multi million dollar company like Minelab take simple hobbyist BW to court ? ... Because it works better than their own product and is allegedly a strategy by by some companies to steal IP from hobbyists.
I am certain that if you layout the BW schematic on a Pcb that "someone" will post up the hex code to make it work.
Start with a mono oil. ..easiest to make. The BW with a monocoil is a superb machine.
Aziz machine is also superb but the Ground balance method is not released yet.
the induction effect is a type of discrim .. But worry about detection first .. Discrim second.

[vbeeeks]

"...I am certain that if you layout the BW schematic on a Pcb that "someone" will post up the hex code to make it work..."

moodz,I'm elated by the call---which schematic are you referring to Atmega644 / ADuc845? BW had already provided for ADuc845 eagle--yes here (on ADcu845 scheme) I thought that using 128x16 dot matrix would have served better OR more so some method to process the info on some tablet OR that cheapo Open Source DSO Nano V2 with modified fw --- as a digital frontend (very opposite to your terminology, where coils and preamp form the frontend). Anyway which scheme?

[vbeeeks]

orange to orange

OR --- do you mean (mind reading!!!) that dsPic33 - TQPF 44-- that ultimate QED machine??? don't kid me ... BW would fire me
.By the way which scheme stoked ML - hope this is not that one --- I feel I must not take sides -- gotta work on my dream machine ... there are some missing data (hell break loose when reversing components) on mosfets, its driver, adg?? etc, I couldn't locate in element14 (only 10 major components located) - ordering and simultaneous eagle libraries helps a lot, whatever version of schematic I grabbed -- were bit blurry - calls for sharpening in photoshop - control bus/connections name are not visible - can recover 80%. Also this asks for double sided fab which may be laid out but for me it'll be tad difficult to have one to play with - so I'll begin with single sided thru hole option for general component except those smd only thingies. Compared to this --- Moodz, your scheme was more pliable -- but then life's a challenge. Ain't we going off topic when referring to BW scheme akin to hijacking this thread, or is this convergence? Ok when we finish (yes I mean literally) this. we can benchmark either of them - orange to orange.

[moodz]

OR --- do you mean (mind reading!!!) that dsPic33 - TQPF 44-- that ultimate QED machine??? don't kid me ... BW would fire me
..

You said it
below is what I reversed out of this post .... http://www.geotech1.com/forums/showt...682#post152682

The critical functionality of the signal chain for a BW detector is shown with details of the exact cpu, power and audio left out. The audio is also clever but that is on the other side of the CPU and is in effect another signal chain. Everything is pretty much in functional blocks even on the circuit diagram ... note that some of the integrating ADC seems to be done inside the CPU ... and I dont mean binary. I am interested in this design because I would want my PI design to be "at least" as good as this one in performance .. so its a kind of benchmark for me.
Now maybe after a few tweaks in the understanding and deciphering of the schematic ... the components can be mapped over the functionality in a clear drawn schematic. Then using the public information already published here and there with some hints from forums like this you would arrive at a functional detector. Note there are two CPUs on the original schem but only one is used for the core PI functions ... the second one seems to be for bells and whistles ...

[dougAEGPF]

moodz,I'm elated by the call---which schematic are you referring to Atmega644 / ADuc845? BW had already provided for ADuc845 eagle--yes here (on ADcu845 scheme) I thought that using 128x16 dot matrix would have served better OR more so some method to process the info on some tablet OR that cheapo Open Source DSO Nano V2 with modified fw --- as a digital frontend (very opposite to your terminology, where coils and preamp form the frontend). Anyway which scheme?

You never know just what open source detector projects with high resolution schematics,board layouts and source codes just might "turn up" on my forum!
dougAEGPF

[moodz]

You never know just what open source detector projects with high resolution schematics,board layouts and source codes just might "turn up" on my forum!
dougAEGPF

You could start charging for membership to download .... but I reckon it needs to post on a russian site .

[moodz]

earth field test results update ....

... been fairly busy with other things however the earth field rejection tests have proven successful. I realised I forgot to check the waveforms around the front end after I did the earth field mod and ( unintended benefit !!! ) the mod actually improved the "no resistor" LOL damping method. I am now getting the minelab reference coil ( actually its a commercial nuggetfinder mono coil ) to damp in 3 microseconds ( was previously around 5 microseconds which was still good ) so I picked up a couple of microseconds.
Now the pic below shows the waveform at the output of the first stage of the detector, the white trace is the mosfet gate, you can guess the rest, its not a very big target but its "tc" is definitely not near 3 microseconds and some of you will realise why my damping method is new and that the old math dont count no more. ... clue the only bit of the waveform that moves is the bit after the flyback ... and no dorothy ... I am not using a switch to do that .. only the target LOL
( maybe get ready to see alot of PI patents become old hat in 2013 ... )

[authere]

... been fairly busy with other things however the earth field rejection tests have proven successful. I realised I forgot to check the waveforms around the front end after I did the earth field mod and ( unintended benefit !!! ) the mod actually improved the "no resistor" LOL damping method. I am now getting the minelab reference coil ( actually its a commercial nuggetfinder mono coil ) to damp in 3 microseconds ( was previously around 5 microseconds which was still good ) so I picked up a couple of microseconds.
Now the pic below shows the waveform at the output of the first stage of the detector, the white trace is the mosfet gate, you can guess the rest, its not a very big target but its "tc" is definitely not near 3 microseconds and some of you will realise why my damping method is new and that the old math dont count no more. ... clue the only bit of the waveform that moves is the bit after the flyback ... and no dorothy ... I am not using a switch to do that .. only the target LOL
( maybe get ready to see alot of PI patents become old hat in 2013 ... )

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Hi Moodz,

Did you get the can at 6' !!!, an 18" coil @1us will open up a lot of ground that was too deep for the littlies, how will this result help with the larger deep nuggets

Ron

PS:Is there much else to do cause i'm finkin i gotta sell me M/L

[Aziz]

Where is the controversy action from UFox again? Or from his mates?
All aggressive actions led to improvements and better understanding.
*LOL*

Moodz, I probably know how you "damp". Quite trivial.
Cheers,
Aziz