I don't know why you are interested in the DC magnetic field strength when your application (sustaining an oscillating piano string) involves AC signals. Especially at the higher frequencies, the AC impedance may become significant.
-Robert Scott Ypsilanti, Michigan
This is interesting, John. Do you think that I might be able to use PCB-mount axial chokes (look like little green resistors) as my coils? Or will ferrite cores give me much pull? Maybe some other standard (cheap) inductor?
Don Kansas City
I just took a look at Digi-Key, and they have some reed relays for $1.19 in 100's. So I'm sure you can get coils cheap, now just look for some long E-cores, like Spehro suggested, and you might be done!
Good Luck! Rich
I doubt it. You need a form that has the core extending out to the edge of the coil, so it is close to the string. Something like these might work:
"eromlignod" wrote in news:1121877843.165642.68820 @g14g2000cwa.googlegroups.com:
(snip)
How much influence does a magnetic field have on an (iron/steel) object? One way to measure the field strength would be to suspend an iron weight on a string. The deflection from vertical would give the force (do some simple vector analysis).
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