In a message dated 02/08/02, lehmancj@........... writes:

> It was brought to my attention recently a good source of magnets for coil 
> pickup or damping purposes are to be found in discarded microwave units.  

       These magnetron magnets are fine for coil pickups, but the field is a 
bit low and the gap rather too wide for efficient damping.
       For damping magnets, I suggest going to Forcefield at 
http://www.wondermagnet.com/dev/magnets.html and getting a pair of #21's at 
$4.20 each. Type #39 at $12.50 each are even stronger. A sheet of 1/8" copper 
in the gap feels like it is moving in thick treacle!

       Type #41 at $1.75 and pairs of Types # 2 at $2.00, or #42 at $2.50 
mounted on mild steel backing plates will give very good signals from coils 
of ~1" dia. These magnets have a N and a S pole on each 'wing' of the face 
and a coil should be mounted centrally over the face. 

       Regards,

       Chris Chapman
In a message dated 02/08/02, lehmancj@........... writes:



It was
 brought to my attention recently a good source of magnets for coil pickup or damping purposes are to be found in discarded mic
rowave units.  



       These magnetron magnets are fine for coil pickups, but the field is a bit low and the 
gap rather too wide for efficient damping.

       For damping magnets, I suggest going to Forcefield at http://www.wondermagnet.com/dev/
magnets.html and getting a pair of #21's at $4.20 each. Type #39 at $12.50 each are even stronger. A sheet of 1/8" copper in th
e gap feels like it is moving in thick treacle!



       Type #41 at $1.75 and pairs of Types # 2 at $2.00, or #42 at $2.50 mounted on mild ste
el backing plates will give very good signals from coils of ~1" dia. These magnets have a N and a S pole on each 'wing' of the 
face and a coil should be mounted centrally over the face. 



       Regards,



       Chris Chapman