PSN-L Email List Message

Subject: Re: Chapman's sensor Design
From: Bob McClure bobmcclure90@.........
Date: Fri, 23 Jul 2010 10:26:36 -0400


I prefer the following block magnets:

http://www.gaussboys.com/ndfeb-magnets/B5012.html
Model: B5012
Size:  50mm long x 25mm wide x 12mm thick
Price: $11.00 each

An assembly of two quarter-inch thick steel plates, four magnets, and a
one-quarter inch gap will yield a field of almost 7,500 gauss. A rectangular
coil of 1100 turns of #38 wire will yield an output of ~80 volts per meter
per second. The coil resistance is only 340 ohms, and you can easily use
resistive shunt damping with negligible loss of output.

See: http://sites.google.com/site/bobmcclure90/horiz

Bob

On Thu, Jul 22, 2010 at 11:46 PM, Kay Wyatt  wrote:

>  Jerry,
> they are magnitized through the thickness.  I order mine through K&J
> Magnetics at http://www.kjmagnetics.com
> The part number is
> *
> BX0X02
> *
> 1" x 1" x 1/8" thick
> Grade N42 - Nickel Plated
> Magnetized thru Thickness
>
> Hope this helps.
> Kay
>
>
>
>
> ----- Original Message -----
> *From:* GPayton 
> *To:* psn-l@..............
> *Sent:* Thursday, July 22, 2010 8:30 PM
> *Subject:* Chapman's sensor Design
>
>
> Looking closely at the drawings on this page, I am not certain about the
> magnetization of the required sets of magnets.  Are they magnetized from
> end-to-end or through the thickness?
>
> Most magnets I have found online, so far, have been through the thickness,
> but I am not sure what is shown on the drawing.  Anyone know?
> Thanks,
> Jerry
>  ------------------------------
>
>
> Here is the link to Chris Chapman's coil design and instructions
> http://www.jclahr.com/science/psn/chapman/lehman/index.html
>
>
>
I prefer the following block magnets:

http://www.gaussboys.com/ndfeb-magnets/B501= 2.html
Model: B5012
Size:=A0 50mm long x 25mm wide x 12mm thick <= br> Price: $11.00 each

An assembly of two quarter-inch thick steel plate= s, four magnets, and a one-quarter inch gap will yield a field of almost 7,= 500 gauss. A rectangular coil of 1100 turns of #38 wire will yield an outpu= t of ~80 volts per meter per second. The coil resistance is only 340 ohms, = and you can easily use resistive shunt damping with negligible loss of outp= ut.

See: http:/= /sites.google.com/site/bobmcclure90/horiz

Bob

On Thu, Jul 22, 2010 at 11:46 PM, Kay Wyatt <kwyatt@.............>= ; wrote:
Jerry,
they are magnitized through the thickn= ess.=A0 I=20 order mine through K&J Magnetics at http://www.kjmagnetics.com
The part number is
1" x 1" x 1/8" thick
Grade N42 - Nickel Plated
Magnetized thru=20 Thickness
=A0
Hope this helps.
Kay
=A0
=A0
=A0
----- Original Message -----
From:=20 GPayton=20
Sent: Thursday, July 22, 2010 8:3= 0=20 PM
Subject: Chapman's sensor Des= ign

=A0
Looking closely at the drawings on this page, I am not certain about= the=20 magnetization of the required sets of magnets.=A0 Are they magnetized fro= m=20 end-to-end or through the thickness?
=A0
Most magnets I have found online, so far, have been through the=20 thickness, but I am not sure what is shown on the drawing.=A0 Anyone=20 know?
Thanks,
Jerry

=A0
Here is the link to Chris Chapman&= #39;s coil design=20 and instructions
=A0


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