Proton Magnetometer

[Baterista]

Because the supplier did not provide the bobbin to the potcores (would have to buy
a package with 1000 bobbins, so the price would be of $ 300.00, really absurd),
I had to use another bobbin millimetrically higher producing a "gap" unwanted, taking
as a consequence the buying another potcore an higher value of permeability to compensate
the problem, this is not an ideal setup, but had no choice.

[Baterista]

As i see the schematic all the transistors at polarisation circuit must be NPN. Try BC547...8..9

I used some BC 549, stayed good.

[Baterista]

Hi.
At relay driver i use a npn , i don't use the schematic by huggard but a 555 timer with a npn transistor (i don't remember if i use normal transistor or darlikton)for turn the relay on.
Now about the capacitor ... i"ll try it with some different values. Did you try it ???

Regards

yes I used the capacitor in the circuit, connected via a switch (on - of), and is so quiet it's scary, you can hear the drips in the kitchen sink.

[Geo]

Hello Geo,you used a PNP? did not work for me.
This can decrease the noise, but I do not know at what price.

[ATTACH]25342[/ATTACH]

As i see the schematic all the transistors at polarisation circuit must be NPN. Try BC547...8..9

[Geo]

Hi.
At relay driver i use a npn , i don't use the schematic by huggard but a 555 timer with a npn transistor (i don't remember if i use normal transistor or darlikton)for turn the relay on.
Now about the capacitor ... i"ll try it with some different values. Did you try it ???

Regards

[Baterista]

Hello Geo,you used a PNP? did not work for me.
This can decrease the noise, but I do not know at what price.

[Geo]

No problem with the relay driver transistor. Its job is only to enable the relay.

From the other side yesterday i tested the magnetometer out at field.
No good results.
There is so much noise that makes difficult to hear the signal from object. As more the volume so more the noise. I was able to hear the signal only at low volume. So from today i must looking for finding the solution of the problem.
I"ll inform


Regards

[Baterista]

Had a small change in the relay unit, I used an NPN transistor (PNP in the original)
and looking at the photo, it seems that the author used another transistor, and not
the specified in the list of components (2N2613), seems to be a 2N2102 (NPN) ,
also in the scheme is indicated the use of an NPN.

[Geo]

Ok, this is the link.

http://www.ngdc.noaa.gov/geomag/operobs.shtml

Thank you

[Baterista]

Part List updated.


Part list.txt

[Baterista]

The method used to making the PCB was the Press'n'Peel, with good results.

[Baterista]

The original files.

[Baterista]

My Ignorance

I believe that through the e-mail has no problem, but to add attachments in the post, it seems that he does not accept these format (RAR, Acrobat, etc.).
I need administrator authorization?
Or have another way of doing it?
Files are large (20 to 60mb).

Hello Geo, forget everything I said, I have seen my mistake, now I know how to do it, thanks again and I'm sorry.

[Baterista]

Can you send it via email or you have the same problem????

I believe that through the e-mail has no problem, but to add attachments in the post, it seems that he does not accept these format (RAR, Acrobat, etc.).
I need administrator authorization?
Or have another way of doing it?
Files are large (20 to 60mb).

[Baterista]

Baterista can you give the adress so to download the magnetic field map

Ok, this is the link.

http://www.ngdc.noaa.gov/geomag/operobs.shtml