Electrical & magnetic field detectors

Thread Starter

johnsy

Joined Jul 3, 2014
28
Hi,

i tested a voltage detection circuit but while it works i would like to increase the sensitivity.

I tried both bc547 and bc517.

I did try to replace the led with a basic lm386 circuit and a small speaker.





Concerning the magnetic field detector, i'm looking for a very very sensitive detector (natural magnetic fields)


Thanks in advance for your help!


Johnsy.
 

Thread Starter

johnsy

Joined Jul 3, 2014
28
inwo,

thanks but i already tried the "electronic electroscope" (mpf-102) described on the amasci website.

But it is not sensitive enough.

I found a schematic for a simple "homemade tri-field meter"




But this also have to be close or have contact (in this case a pickup coil).


I've seen videos of hall effect sensor circuits, but you need to be really (too) close to the source.
 

Thread Starter

johnsy

Joined Jul 3, 2014
28
maybe a flux gate magnetometer would work better.
That's an idea but remember that it is for outdoor work, the fgm might work better indoor.


Most devices i found are "permanent analysis tools for measurement of the earth magnetic field" which is not what i'm after.

looking at the tri-field earth magnetometer it's said to have a resolution of 1nT, which might work (with a probe).

Have you tried different values or resistance for the 1M resistor, ideally lower.

No, what do you suggest? i mostly tried various antennas replacing the copper strip.

The pickup coil gave good results but (obviously) not really practical outside.





 
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