Date: Wed, 6 Oct 1999 18:29:16 -0500

Author: (Karl Trappe)

Subject: Re: Barkhausen


>At 14:14 10/6/99 -0600, you wrote:
>> Someone just asked me to set up the Barkhausen Effect. Are there any
>>tricks that I should know? I tried it with junk I have but my Bark didn't
>>Duane Warn
>>Boise State U.

Try using one of those cheap magnetic induction pick-up coils Radio Shack
sells for inductively recording phone conversations. It has a suction cup
bottom which attaches to the phone, and then goes to an amplifier. If you
pass this across a magnet, you hear the clicks in the field of the thin
metal cover of the induction coil device as the domains flip upon changing
the direction of stroke across the magnet. Karl

Dr. Karl I. Trappe Desk Phone: (512) 471-4152
Physics Dept, Mail Stop C-1600 Demo Office: (512) 471-5411
The University of Texas at Austin Home Phone: (512) 264-1616
Austin, Texas 78712-1081