» MAKE: NOISE — Discuss this article

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• Damping ratio when tuned to maximum deflection
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  OK, I've built this project, and it seems to work quite well. I've been looking at the output of the sensor charge amp, as the article suggests, and compared power on vs power off, and the results are as expected.
  
  Has anyone calculated the damping ratio and compared power on vs. power off? I'm getting very small numbers in both cases (I would expect a small number in the unpowered case) but looking at the graphs, it seems like maybe the powered damping ratio should be higher. The ranges are around .021.
  
  Thanks
  Ted

  Posted by Ted Jones on June 07, 2008 at 08:13:42 Pacific Time

• Piezo ceramic wafer
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  I’ve been checking the website of the company you recommend and I noticed that the wafer is way too expensive. Do you know where can I get the piezoelectric of these dimensions as salvage? I have worked with piezoelectric on clock signal generators for microcontrollers but they are tiny compared with the dimensions required for this project. Do you have any suggestion?
  Thanks!!
  

  Posted by Parga on May 03, 2008 at 15:51:42 Pacific Time

• m324
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  It says you need a M324 operational amplifier chip. Should this be a LM324 because my electronics store never heared of it. Or other wise where can I order one??
  
  Thanks, menno

  Posted by mennauw on April 14, 2008 at 07:47:26 Pacific Time

• Nano or Micro Farad caps?
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  This looks like a fun project! The parts list in the magazine article states micro farad caps. The online schematic shows nano farad caps. I suspect nano ones are used but would like confirmation. Any thoughts?

  Posted by Paul Oh on March 31, 2008 at 11:14:41 Pacific Time

• Nano or Micro Farad caps?
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  You are right. They are nano. There was a typo that didn't get fixed. Sorry about that.
  
  Steve Griffin

  Posted by Nevets Niffirg on April 11, 2008 at 20:30:15 Pacific Time

• Really neat
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  This is very cool. I wish I could think of a project to incorporate it into...

  Posted by drysdam on February 24, 2008 at 18:41:24 Pacific Time

• Really neat
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  The first thing I thought of to use this for is for a base that would go below my turntables or even for the whole table that the stereo equiptment sit on. The less vibration that is going into the turntable the clearer the sound. People use all kinds of bases from marble to mdf to try to neutralize the vibrations. This would be a perfect application although on a bigger scale than the project here. I wonder if there would be any electrical or magnetic interference.

  Posted by namyen on March 25, 2008 at 20:25:15 Pacific Time