An even lower noise measurement technique - Page 2

Pano · 27th October 2009, 01:44 PM

So I been building in steel biscuit and chocolate tins all this time without knowing it was low noise. I just liked the free boxes!

Conrad Hoffman · 27th October 2009, 02:02 PM

John is one smart cookie. I've had shielding problems in scientific equipment that could not be solved with thin shielding of any type, including mu metal. It was a magnetic pickup problem and the solution turned out to be a simple plate of 1/2-5/8" aluminum. The field creates eddy currents in the aluminum and the energy is dissipated as heat, but you really need to be up around 1/2" or more before it's really effective.

jackinnj · 11th January 2011, 10:01 PM

We have certainly solved the "Pin 1 Problem" with this cookie tin -- I must say that the Costco scots biscuits were much better than Fortnum and Mason:

27th October 2009, 02:02 PM	#12
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	John is one smart cookie. I've had shielding problems in scientific equipment that could not be solved with thin shielding of any type, including mu metal. It was a magnetic pickup problem and the solution turned out to be a simple plate of 1/2-5/8" aluminum. The field creates eddy currents in the aluminum and the energy is dissipated as heat, but you really need to be up around 1/2" or more before it's really effective. __________________ I used to be an audiophool like you but then I took an arrow to the knee.

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27th October 2009, 01:44 PM	#11
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	So I been building in steel biscuit and chocolate tins all this time without knowing it was low noise. I just liked the free boxes!

11th January 2011, 10:01 PM	#13
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	We have certainly solved the "Pin 1 Problem" with this cookie tin -- I must say that the Costco scots biscuits were much better than Fortnum and Mason:

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