Practical Guidelines for building a Magnetometer by Hobbyists

[Jan]

Re: Jan

Larry,

It might come to a suprise to you, but I do make a big difference between you and Dell.
You can see that in the way I talk to you or to Dell.
Also have a look at de endings of my posts to you or to Dell.
If I signoff with "Best regards" then I mean that
If I signoff with just "Jan" then I do not mean "Best Regards" ... if you get my drift.

You believe in LRL, I do not.
This has nothing to do with Carls article because I never believed in LRL.
I have very often looked into Treasurenet LRL forum (and other forums) but rarely participated in any "wars" going on there.

I just read all these questions, answers and had a look at the links provided by some people.

The thing that struck me was that LRL believers could not or would not give any proof of their claims.

I have a very simple aproach to this.

If LRL works then I must have a higher "hit rate" then when I just chance it.
If I do not get a higher hit rate.... then what good is an LRL to me ?

Do you not find this a valid question?

The only thing I ask is .... If you think LRL improves your hit rate, then show it.

But nobody wants to do that.

Do you understand my "problem" ?

I tried to explain this all with my head/tails example.

I do believe there are many LRL who honestly believe their instruments work.
There are two things I can think of that might cause these people to believe that.

1) The Ideomotor response.

2) Forgetting all the times they did not find anything
Same happens with Horoscopes.
When a horoscope is correct once, people tend to remember that, but forget all those times that the horoscope was wrong.
After a while they are strong believers in Horoscopes... because it is "always" right.

This is my personal believe and has no sientific background... In case people might think I have gone Psycho analitical ;-)

The thing that got me a bit angry was the obvious scam with the VR-800

That got me in this discussion and for the first time in a not polite way... well second time to be honest, but that was not about LRL.

About my "Mooing".... better not, we have this horrible cowdisease over here at the moment and they might put me down... :-))

Best regards,
Jan

[Willy Bayot]

Practical Guidelines for building a Magnetometer by Hobbyists

Just to indicate that my Gradiometer project is now in a sufficiently mature status to start etching the boards.
See the latest documentation version at :
http://perso.infonie.be/j.g.delannoy/BAT/PPMGuidelines.htm

Willy

[jackdetect]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

Hi Willy,
The great job, thanks.
Jackdetect.

[Brian B.]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

Willy,

I can burn high quality masks onto transparency film for your PC boards. In fact I just made two sets so drop me a note with a snail-mail address and I'll send you one (sure beats using a laser printer). Thanks again for the great work and I hope this helps a bit.

Regards,
Brian B.

[Willy Bayot]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

Hi Brian,

Thank you for the proposal.
I am now compiling a part list with some procurement indications. I shall post it on the web later on today.

Willy

[armin]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

Hi Willy

I have a question to your polarization control unit.
May be I am wrong, but I think, if you switch off the p-channel MOSFET IRFP9140, then the high side of the sensor get negative compared to GND. In this case the drain of blocking n-channel MOSFET IRF530 should also get negative compared to its source. Therefore the inverse protection diode of this FET would limit the switch off voltage of the sensor to -0,7 V. And this would cause a much to slow sensor switch off time. Sorry, but
I cannot imagine, that this unit could work.

Regards

Armin

[Willy Bayot]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

Sorry but I think you were looking at an old version of the circuit.
Please, look at the latest revision of the document at :
http://perso.infonie.be/j.g.delannoy/BAT/PPMGuidelines.htm
This version has already been proven in practice.

Willy

[Willy Bayot]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

Gradiometer project status:
- Main board and one amplifier channel board made and adjusted to the alu box.
- Main control program and two signal analyzer programs written in C. (as planned, programs were straightforward codes)

ROM/RAM filling percents:
Main control code: ROM=36%, RAM=41%
Basic Signal Analyzer: ROM=37%, RAM=38%
Advanced Signal Analyzer: ROM=58%, RAM=61%

Next week:
- Mounting/Soldering components
- Testing main control program (LCD, KBD, Buzzer, I2C EEPROM, RS232, Polarization control protocol)

Willy

[Pavel]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

Willy,
As it's no any worlds about power supply said by you,
I should ask you following:
As noted on schematics it is 10 V power suply
for amp circuit (IC4 on main board, I guess).
But on partlist there are no such device, and
only power suply noted (besides 78L05 (U5)) is
LM2940/5 as 5 volt supply. Which is correct?
Is there partlist with reference available?
How is your project status?
Sorry, more you do more questions you get.
BRGDS

[Willy Bayot]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

The LM2940/5 is indeed a 5V supply but its reference is connected to the ground through a 5V zener diode. Thus, it supplies a regulated voltage of 10V.

There is a partlist (excel file) available on the web site.

I was starting the mounting and soldering of the components on the boards when I had to go to the hospital where I have been fixed in bed for a whole week but I am now back home and I hope to resume my work on the project.

Willy

[Willy Bayot]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

Finally out of my health problems (I hope).
Finished mounting and soldering the main board and one channel board.
For those who have already etched the PCB, there is a patch to be applied for the Version 1.0c.
See the latest documentation version at :
http://perso.infonie.be/j.g.delannoy/BAT/PPMGuidelines.htm

This week-end, will start the tests.
Also, I shall try to shoot a picture of the PCB's inserted in the box.

Willy

[Willy Bayot]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

Finished the mounting and tested the power supplies.
This is the current packaging results (one channel only and without chips inserted)http://perso.infonie.be/j.g.delannoy/BAT/inbox.jpg
http://perso.infonie.be/j.g.delannoy/BAT/outofbox.jpg
http://perso.infonie.be/j.g.delannoy/BAT/mainPCB.jpg
http://perso.infonie.be/j.g.delannoy/BAT/channelPCB.jpg

I am now writing the test procedures and corresponding specific test programs.

Willy

[Willy Bayot]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

Sorry, the links must be:

http://perso.infonie.be/j.g.delannoy/BAT/inbox.JPG
http://perso.infonie.be/j.g.delannoy/BAT/outofbox.JPG
http://perso.infonie.be/j.g.delannoy/BAT/mainPCB.JPG
http://perso.infonie.be/j.g.delannoy/BAT/channelPCB.JPG

Willy

[Willy Bayot]

Re: Practical Guidelines for building a Magnetometer by Hobbyists

Version 1.0e : Detailed test procedures have been written in Gradiometer Project document. At this time, only procedures 8.1 and 8.2 can be executed as the various test programs have not yet been written. Even if their hyperlinks have been prepared on the document, they are not yet effective.

Willy

[Willy Bayot]

Latest revision of PPM Guidelines

Hi all,

I have now tested two different versions of the amplifier/filter/comparator channel card and have posted on my site the latest revisions of the corresponding files.

Willy