Hi: I have a number of very early electro-magnetic Toy DC Motors and would like to find out what the maximum drive voltage is that's useful. Measuring the ...
Ok...so do I understand this right...you have some old DC motors that you do not know what the operating voltage is on them...? I would say this, if I would be...
Alright then...do you have any idea of what the rated rpm is of them...? Even a good guess if there is nothing stated in them. Was thinking you could use a ...
Hi Island: Not really any idea about RPM. Also most of these were designed to run from No. 6 Dry Cells. It wasn't until I did the math on the Toy Motor Kit...
Did you say 17 Amps...???? That must have been one hell of a toy, and a hell of a battery as well! You mean 1.7 Amps...right..? ... Connect with friends from...
Hi Island: YES, SEVENTEEN amps. It was a suprise to me also. In the mid 1800s and early 1900s "Pocket Ampmeters" were popular. They were used to test the...
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...
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