GROUND CONTROL PI CIRCUIT

[mickstv]

I wondered if you were using a micro, as there are two variables that need adjusting (A2 and A3) in equation 1, as opposed to one variable (A2) in equation 2.

With the micro I just used ADC1 and ADC2 inputs to control the delays using potentiometers. The micro also controls a blocking fet circuit. The receive circuit is still analog all the way to the headphone socket.

[Qiaozhi]

With the micro I just used ADC1 and ADC2 inputs to control the delays using potentiometers. The micro also controls a blocking fet circuit. The receive circuit is still analog all the way to the headphone socket.

What micro did you use in your circuit?

[mickstv]

What micro did you use in your circuit?

It's a PIC18F25K22 it's only a 8-bit PIC, but I might need to look at something faster 16-bit or 32-bit.

[Silver Dollar]

That is a 16 bit and you can run it at 64 Mhz (16 MIPS) that's pretty quick for a Micro.
The 30F's will go a bit faster though if you find yourself needing some horsepower. Problem
is programming (if your not using "C")...

[mickstv]

That is a 16 bit and you can run it at 64 Mhz (16 MIPS) that's pretty quick for a Micro.
The 30F's will go a bit faster though if you find yourself needing some horsepower. Problem
is programming (if your not using "C")...

Yeah it's 8-bit but runs 16-bit wide instructions. The problem is I've been using software called Flowcode to do the coding and it has limitations, so I might have to look C.

[Silver Dollar]

Have a look at my code. I'm using Great Cow Basic. It's easy to program and creates some tight assembler.
http://www.geotech1.com/forums/showt...764#post182764

I'm getting close to needing to understand how to ground balance so am hanging around here. It would be
nice if a general rule could be found on how wide the pulses should be for different TX widths. I'm settling
on 2 or 3 different widths so maybe experimental measurements can be made...

[mickstv]

Have a look at my code. I'm using Great Cow Basic. It's easy to program and creates some tight assembler.
http://www.geotech1.com/forums/showt...764#post182764

I'm getting close to needing to understand how to ground balance so am hanging around here. It would be
nice if a general rule could be found on how wide the pulses should be for different TX widths. I'm settling
on 2 or 3 different widths so maybe experimental measurements can be made...

Thanks i'll have a look at Cow Basic.

I use a single TX pulse of about 140us and runs on about 7 volts via a 1 amp LDO regulator. The S1 sample I'm using is actually about 8us and starts about 10us after TX end. The GB sample width is similar in size to the TX pulse width. The EF sample is the same width as the GB sample - S1 sample.

[greylourie]

I'm getting close to needing to understand how to ground balance so am hanging around here. It would be
nice if a general rule could be found on how wide the pulses should be for different TX widths. I'm settling
on 2 or 3 different widths so maybe experimental measurements can be made...

Hello Silver Dollar.

If you have a look at this post, ( http://www.geotech1.com/forums/showt...pdf#post152711 ) it gives a link to a pdf download with a nicely illustrated ground balance example drawn to scale. Method A shows a scheme using a tx period of between 150uS - 200uS. Screen capture and pasting into a common graphics program could give you a pixel count/ratio on the various time periods, which could be used to give you ballpark figures for your own experiments. From reading what is posted on the internet about the above patent, and from looking at some code on a certain Russian site.... S2 is used to counter or " Ground Tame" difficult/hot ground. Possibly for your experiments you would not need S2. This scheme will reportedly work with the Hammerhead, Goldscan4 and others.

[Waikiki_Sweep]

Unfortunately that PDF has been lost (404 Not Found) and patent link shows images that was not to easy to read.

But patented idea works perfectly and author of patent has working detector built - QED by Bugwhiskers.

!!! RESULTS ARE SHOCKING !!!

See how it detects 0.08 gram nugget http://www.youtube.com/watch?v=-dgZzGOIPlQ

Some links on QED:

http://australianelectronicgoldprospectingforum.com/qed-micro-controlled-pi-detector-by-bugwhiskers/

http://www.geotech1.com/forums/showt...php?19376-QED/

Also You can find a PCB, schematic and software to build the machine gathered in one ZIP file here:

http://www.md4u.ru/viewtopic.php?f=96&t=8358&start=0

[Aziz]

Also You can find a PCB, schematic and software to build the machine gathered in one ZIP file here:

http://www.md4u.ru/viewtopic.php?f=96&t=8358&start=0

Greedlab won't be happy about this link here. Even it isn't their IP or work.
(Admin!, do not delete this link please! Otherwise, hmmmm... the thermo-nuclear war ... )

4212

[greylourie]

Unfortunately that PDF has been lost (404 Not Found) and patent link shows images that was not to easy to read.

But patented idea works perfectly and author of patent has working detector built - QED by Bugwhiskers.

!!! RESULTS ARE SHOCKING !!!

See how it detects 0.08 gram nugget http://www.youtube.com/watch?v=-dgZzGOIPlQ

Some links on QED:

http://australianelectronicgoldprospectingforum.com/qed-micro-controlled-pi-detector-by-bugwhiskers/

I think a bit of searching on the australianelectronicgoldprospecting link will give you a pdf download of the ground balance example.

[Waikiki_Sweep]

I think a bit of searching on the australianelectronicgoldprospecting link will give you a pdf download of the ground balance example.

"Please login or register." is only what I can read on that forum. All search engines indexing nothing from such content. I do not think it helps to increase popularity of such forums.

Sure I have registered but also I have to wait to approval by admin for hour or day or so.

Look at Russian forums. They let you read everything. Search engines indexing them. People finding them. So only those forums will survive after a time. Everything else goes down to oblivion.

[Thomas]

qed-patend-markup-1.pdf Is this the PDF you are looking for?

[Waikiki_Sweep]

[ATTACH]27859[/ATTACH] Is this the PDF you are looking for?

Thank you soooo much!!!! With time marks it is much better than original patent.
More I read more I am sure that QED is outstanding machine made by genius.

I am not even expecting someone ever to be brave enough to make a kit from it because you know
the thermo-nuclear war ...
Nobody wants such technology leaked to public access.

Also everything looks simple enough.
If "S2" is optional there are only three samples needed to cancel ground:
1. Plus 19 uS
2. Minus 125 uS
3. Plus 116 uS
Sure with changes to width and phase for particular ground conditions.

[Tepco]

Also everything looks simple enough.
If "S2" is optional there are only three samples needed to cancel ground:
1. Plus 19 uS
2. Minus 125 uS
3. Plus 116 uS
Sure with changes to width and phase for particular ground conditions.

Actually, as I figured out from source code, goes more like this: 60uS EF cancellation sample, followed by 150uS TX pulse. Then, without “hole shifting”sample, goes 10uS delay, then 10uS positive, then GB delay (integrator disconnected). This is variable and used to adjust GB point. Then, 150uS negative, again GB delay, same duration as before, then 140us positive. Optional “hole shifting” is 5uS negative before first sample.