[R-390] Filters

[John Kolb]

Ouch!

The wire does need to be magnetic.  The wire vibrates at a 455 kHz rate 
in the magnetic field created by the magnet.  This causes the magnetic field
to vary, so that a voltage is induced in the pickup coil.

Not sure how to repair that problem - maybe some sort of arc welder with
a car battery and some way to interrupt the current before the steel wire melts.

John

At 12:37 PM 2/16/2013, you wrote:

I'm not sure what the magnets do, but I do notice that the holes in the center of the plastic bobbin holders seem to want to be off center away from the output wires to make the center wire line up in the center of the bobbin hole.  I guess that's what that piece of tape was for under the end of the bobbin where the wires come out.  It gave a way to put in the bobbin and also spaced the bobbin to center the wire.

I'll look around on the desk for the wire, but it's probably stuck to something, it seemed to be magnetic.