I want to make a few single string diddley bow pickups with sewing machine bobbins.Would it be ok to use aluminium bobbins?....

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Bobbins should be non-conductive. Wood or acrylic thin boards around 1/8" or 3/16" would be recommended. Or any  non-conductive material, even a vinyl record.

Coils need to be suspended, if you used aluminum, you can fry the whole shebang.

=D actually, you'll get nasty feedback, louder and worser than the 60 cycle hum.

Thank you.That's what I suspected,,,,

Just do like I did. Crack open an old wall wart, extract the transformer and use that as the coil.

You can then hide it in the bow and use a metal sewing machine bobbin for decoration on top of the coil. Just make sure there is a magnet inside the coil itself.

On my prototype 2 string bow, I have a big metal washer on top and it works just fine.

Thank you,Francois...

If you are talking about using an aluminum bobbin for wrapping the coil wire of a magnetic pickup, I'd say you will get something between interesting and disappointing.  Although aluminum is not Ferromagnetic, it does have some strange interaction with moving magnetic fields reacting with an induced current with an opposing magnetic field axis. 

An AC magnet will hover over an aluminum plate. 

Thank you,JL.I think I will stick with making bobbins from plastic or wood...

It is an interesting question, because in times gone by, we had a thread regarding so called "induction pickups", unfortunately, the object that initiated the thread had a dis agreement with someone and in a hissy fit closed his membership/ links with CBN, unfortunately due to the original initiator "owning" the thread, when he left , some 30 or 40 pages of development went as well. But, more relevant to your query is the fact that, essentially the the bobbins were a conductive material, but also the actual coil, but they needed separation/ isolation  from the magnets, I suggest that assuming you are using cylindrical magnets,a simple tube of heat shrink around them should see you ok, there is nothing I'M aware of that says the bobbin can't be alive, but, you do need separation from the mag field, of course you also have the issue where the actual winding on the bobbin needs to have a start and finish, but that is pretty easy to overcome

That's interesting.Perhaps I will experiment with them and see what the outcome is....

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