"The Secret World of Magnets" - QUESTIONS

[bastonia]

Greetings All,

I have been doing a lot of reading, and I need your help.  If you review the book "The Secret World of Magnets" by the late Howard Johnson,

( Located here on the web ... http://www.scribd.com/doc/34317/Spintronics-The-Secret-World-of-Magnets-2006-by-Howard-Johnson )

Reviewing his findings, I would like to figure out how to replicate his magnetic scanning technique using a hall effect chip,  ( Which he accomplished in the 70's )

I would like to prove for myself that magnetic fields really can move in Fibonacci swirls.   It really does seem like an over looked missing link.

So the Question is ... does anyone know where to find additional information or ways to build your own hall effect reader.


Thanks All

[Doug1]

Mr Johnson seemed pretty straight forward in how they constructed their test rig. Off the cuff I would
think you could use a pc printer and a sound card tied to a hall switch. Some of the earlier lazor displays
used for complex effects for night clubs used printer mechanisms to operate the beam to provide graphic
images onto walls in the form of text or other visual images. The printer carriage was the steering component for the x y axis which already works in stepper fasion. You have to work your own asci codes.
  There may be some share wear soft wear left out there on the net already put together you can play with
  and make your own rig from an unwanted printer by adding a hall holding arm that attaches to the ink cartridge and advances it's reach off the paper feed motor with a counter balanced advancing arm.It would have to extend out in both directions from a center point to be counter balanced and stable since your only looking for sweep in steps on a flat plane. You'll figure it out, it's not rocket science.