On 4/23/07, Russell McMahon wrote: > > > For really demanding applications mu-metal is the super miracle > material, can be bought currently and has the super miracle price to > match. Some old surplus valve equipment has mumetal valve shields but > this is also probably getting down to the Dodo teeth level. You can find little slabs of mumetal in hard drives, Older ones are usually easier to open up. The magnets are also very strong glued to the mumetal. John -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist