Hi MIKE.

10-Sep-03 09:26:44, MIKE ROSS wrote to Jasen Betts


 MR> "Jasen Betts" bravely wrote to "MIKE ROSS" (09
Sep 03  19:15:04)
 MR> --- on the heady topic of "VEHICLE LED'S"

 JB>> 05-Sep-03 23:00:50, MIKE ROSS wrote to Greg Mayman

 MR>> I forget what this clicking effect is called. You can also hear
 MR>> it with an electric guitar going through a fuzz box. When the
 MR>> strings are gently moved one can hear that magnetic clicking
 MR>> effect.

 JB>> that'd be the clipping in the amplifier in the fuzz box... fuzz
 JB>> effect is a heavily clipped signal.

 MR> No, it isn't clipping in the amplifier (besides clipping is
 MR> supposed to occur in the fuzz box and not in the amplifier).

by "amplifier in the fuzzbox" I meant the gain stage inside the fuzzbox
before the clipping diodes.

 MR> No, the effect I'm speaking of is a real phenomenon with the
 MR> discoverer's name given to it. I'm just drawing a blank at the
 MR> moment. Oh, ya, just got a brain flash!

 MR> Barkhausen Effect - A succession of abrupt changes which occur
 MR> when the magnetizing force acting on a piece of iron or other
 MR> magnetic material is varied.

 MR> Like I was saying if one amplifies the audio signal a whole lot
 MR> one can actually hear tiny clicking sounds as we very slowly and
 MR> gently disturb a magnetic field. Have you never experimented the
 MR> Barkhausen Effect?

I've never noticed it.

 MR> I read someplace the clicks are caused by the magnetic lines of
 MR> force rearranging themselves across different domains of the
 MR> magnetic material. As you know a magnetic material isn't uniform
 MR> but is formed of little islands of magnetism called domains which
 MR> roughly follow the crystal arrangement of a metal's atoms.

hmmm, that makes some sense ... I'll have to do some experiemnts.

 -=> Bye <=-

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