Isolation Ward

diabolical digital machinations

63.16.14.132

In Reply to: RE: The Clever Little Clock isn't THAT clever... posted by Wellfed on January 31, 2008 at 13:35:18

Since Geoff says I am totally off base, I see no reason why I need withhold the following experimentation.

I bought a couple of Advance brand alarm clocks: about $9.95 list at my local drug store. They need a AA battery which is not provided.

I placed two magnets,, neodymium types since I had them, on the face with another on the rear. The round plates on the CLC are magnets, BTW, just weak ones. I used the neodymium ones simply because I had them on hand, and they can be purchased at various electronic surplus stores, like All, Marlin P Jones, etc. although their stock will vary. IIRC I paid roughly about a $1 apiece for the magnets.

Using the neodymium magnets makes experimentation a bit more interesting as they are so powerful that will stick to each other through the thickness of the clock or your hand , for that matter. They are easily removable and thus the same clock can also serve as a control.

Magnets in place I simply opened the battery lid and stuck in a battery. Experimenting with various starting points gave me an audible difference in sound (interestingly I could easily hear this in my car system with a factory system (Mazda B4000 truck).

I also took a piece of EMI shielding material magnetically permeable and experimented with the sheet. Placing the sheet under the clock between the clock and the dash showed a reduction in the audible effect: less dynamic range and lower S/N ratio. Placing the mat, which is magnetic, BTW, places less emphasis on the attacks and a bit more tone quality audible on the follow through of a note.

The wrapping of ERS cloth around the clock similarly reduces the sonic effect heard.

FYI, make what you want of it.

Stu

Follow Ups:

RE: diabolical digital machinations details desired - rick_m 23:20:57 02/04/08 (2)
- For Well fed and Rick.... - unclestu52 12:01:15 02/05/08 (1)
  - Magnets and clocks. - rick_m 19:47:07 02/07/08 (0)
I admire your industrious nature... - Wellfed 23:12:00 02/04/08 (0)

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