I am getting ready to begin testing my FGM-3 based magnetometer that produces an analog output based on phase locking the FGM-3 to a crysyal oscillator with a...
I have made a first attempt at reconstructing the schematic of the FGM-3 magnetometer. The component labeled xray and schematic are in my photo album. ...
Hi John: Thanks for the X-Ray. When I tried it the result was not as good. I think you should have 4 coil terminals: L1, L2, L3 and L4. Two are for the...
... I deduced the connections I show on the schematic partly by a resistance measurement between ground and feed back pin (<10 ohms) and the recommendation...
HI John: I agree there are two coils, and it would be good to call the terminals L1, L2, L3 & L4. It might help to have an X-Ray taken with the unit rotated...
... The pairs of stacked traces are offset just enough that I can tell which is which for most of the branches. I think. ... Thank you. This should provide...
I just received my transparancy scanner from eBay and replaced the first xray of the FGM-3 with a better version in my photo folder. I also placed a file of a...
Folks, I'm sorry, but yahoo web services doesn't behave like it did in the fist days. So message posting, notices, etc. might take a little longer than...
YAHOO web services doesn't behave like it did in the first days. So message posting, notices, etc. might take a little longer than expected due yahoo's ...
I am new at this but just posted a circuit using the KMZ10 magnetic sensor with temp compensation. Unfortunately I have no means of flipping (but see how I can...
... how ... I think any OP amp as current source will work. I have some questions on your schematic. What is the amplitude on the connection line ? Why are you...
... The only difficulty in building a coil is to design a low noise and stable current source to drive it. I assume you just want to use it as an offset bias....
Thanks for your comments, John and Alexander, From your comments it is obvious I do not know what I doing. All I did was take the KMZ10 circuit from the app...
To aid in reconstructing the internal structure of the FGM-3, I have uploaded to my photo folder, scope captures of the feedback pin waveform, the supply...
... (snip) I did not meant to tell you that your circuit was wrong or bad, but just that you might be able to push a bit more signal to noise ratio out of it...
... I thought the same way. I found an op amplifier, made by Linear, LTC2050, however Analog's are also very good. I do not care about DIP packaging, but I...
... noise, ... (snip) ... I think, for this bridge source, an instrumentation amplifier configuration is most likely to provide a low noise, supply rejecting...
... This schematic certainly resembles what I find inside the FGM-3, in many ways. Does it represent your reconstruction of that device, a reference to a...
Hi Les: Do you have more details on L3-L4 like # of turns, wire size, core dimensions, etc? Thanks very much, Brooke Clarke w/Java http://www.PRC68.com w/o...
In the FGM3, there is a Metglass strip, between two strips of rubber, with the two windings wrapped one on top of the other on the rubber strips. I have used...
... Excellent, thank you. Did you arrive at the component values by test, or did their labels survive the solvent process? Did your exposed unit look like...
I may have added the 10uf cap. I did this a over a year ago. The component values were determined by measurement. The actual magnet wires insulation did not...
... Your schematic shoes two separate windings. My xray is a composite of two shots, and the orientation was shifted between them, so the cylindrical coil...
... I remember why I added the 10uf capacitor. When I was working with the FGM-3 modules, and had two of them running from the same power supply, they would...
i need help in designing a measurement procedure for measuring the earths magnetic field on my campus. i need help relating to choice of distance between...
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