PSN-L Email List Message

Subject: Re: Chapman's sensor Design
From: Bob McClure bobmcclure90@.........
Date: Fri, 23 Jul 2010 10:34:28 -0400


Oops!!! The magnet meant to recommend is 50mm long x 25mm wide x 6mm thick,
Gaussboys model B5006.

http://www.gaussboys.com/ndfeb-magnets/B5006.html

Sorry about the error.

Bob

On Fri, Jul 23, 2010 at 10:26 AM, Bob McClure wrote:

> 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
>>
>>
>>
>
Oops!!! The magnet meant to recommend is 50mm long x 25mm wide x 6mm thick,=
 Gaussboys model B5006.

http://www.gaussboys.com/ndfeb-magnets/B5006.html

Sorry about the error.

Bob

On = Fri, Jul 23, 2010 at 10:26 AM, Bob McClure <bobmcclure90@.........> wrote= :
I prefer the foll= owing block magnets:

http://www.gaussboys.com/ndfeb-magnets/B50= 12.html
Model: B5012
Size:=A0 50mm long x 25mm wide x 12mm thick
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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