Hi: I'm working on making a Joule Thief (google it) which powers a white LED from a single cell. Since the LED needs much more than 1.2 or 1.5 volts a voltage...
... No, I don't think so. You are applying the rules of linear inductance to this nonlinear case. At saturation, the relative permeability of the saturated...
Hi John: Yes. I get it. At saturation there is no longer an increase in the field which is a change that causes voltage to be induced in other windings....
... But it doesn't collapse. it just continues to increase at a lower rate with respect to the current. Think of the saturated core material as a permanent...
Hi: I've been looking into how to choose the wire size and number of turns for a toroid core that I'd like to drive with less than a volt. My intution said ...
... turns for a ... intution said ... turn lowers ... number of ... Are you at all concerned about inductance or frequency, or only with DC effects resistance...
Hello good customers, we decided not to post this to the FQS website due to confusion resulting from similar messages in the past, such as when I was in the...
The way that I understand the soft iron can be compensated by rotational calibration. My question is how far can rotational compensate for the soft iron...
Hi John: It depends. Based on the theory I know. Suppose you made a polar plot, using the X and Y sensor outputs, by rotating the sensor assembly on a...
... I ... magnetic ... Typically soft-iron magnetic distortion will turn the XY circular plot of magnetic sensor outputs (arctan Y/X) into a tilted oval...
Hi: I got a dip needle and it does not seem to point like it should. I'm guessing that it's not as strong as when new. How to check that and magnetize if...
... Hello John I appreciate that your post was more concerned with theory rather than a specific application - but - just in case you DO plan on placing a ...
Back in the late 1960's I was involved in a project that mounted flux gate compasses inside Police cars. We had a jig built that the car was driven upon, and...
Hi, my name is Dani. I just graduated and started working for a company doing some research on magnetometers. Do you know if a magnetometer is capible of...
Hi Dani: It depends. If the magnetometer is close to the pipe and the air gap changes due to pipe vibrations then you will pick that up. An audio microphone...
Another problem is that if the magnetometer is a flux-gate type or oscillating type such as the SCM-3 then the frequency range could be quite limited...
Thank you for your responses. The goal is to be able to detect pipe vibration from above the ground level. Therefore, accelerometers and capacitance sensors...
Dear all, I've been reading about different 3D compass units. Some of them requires two type of calibration, XY and XZ and some do not require any calibration....
Hi John: For what purpose? In what quantity? If small do you have a way to attach the package? What is the delivered price for each? Have you compared the...
Seeing as it's been quiet here for a while, maybe I could enquire what the latest thinking is regarding the ultimate cause of the earth's magnetic field ? I...
Hi everybody my name is Milo, I hope you are all well. I am very interested in magnetometers and I have some questions regarding them. Sorry if some of my...
Since you have a UK address, I would check out the gradiometer kit at Speake & Co. in the UK. Their web URL is: www.speakesensors.co.uk They are on holiday...
You may also check out: www.stefan-mayer.com/Lcsing.htm I am running a fluxgate of this company for a year now for monitoring earths mag field and its highly...
Regarding temperature stability of the Speake FGM-3 and FGM-3h for monitoring the earth field fluctuations. I sealed mine in a length of PVC plastic pipe and...
Hannes, I got a so called FL1-100 from Stefan Mayer. This is a 'special' he usually doesnt carry (for one component mag field measurement) - so please ask him...
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