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Gadget Freak Case #240: MEMS Mics Up Telescope

Jerald Cogswell created a sonic telescope to grab sound and bring it as close to the user as the image.
Click here for build instructions, BOMs, and more.
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5/9/2013 | 6 comments
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Charles Murray
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Nature documentaries
Charles Murray   5/15/2013 7:29:34 PM
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This technology would be great for nature documentary directors, who must stand 200 yards away from dangerous animals while they record. The low signal-to-noise would enable them to pick up sounds from a distance without a lot of distortion.  

William K.
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#240 MEMS Microphone
William K.   5/31/2013 8:07:06 PM
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This is a project that is very interesting, even moreso the version using the satellite TV reflector. So where is the information, I would like to build one of them. I did not get the name or model number of the microphone, but it sounds like an Analog Devices type thing. Where is the project build information, please?

78RPM
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Re: #240 MEMS Microphone
78RPM   7/12/2013 12:06:55 PM
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William K, It looks like the Build Instructions have retired from the article. If you wish to send me an email at jjfrigatebird@gmail.com I will reply with the parts list and build instruction, assuming the editor has no objection.

You are correct that the devices are Analog Devices.  The mic is an ADMP504, the difference preamp is an AD8273, and the output amp is an AD8397 configured as a difference amp to handle the balanced line from the preamp stage. The quality of sound is excellent and would probably serve in a recording studio with proper mounting.

Maybe I'll see you in another Digi-Key Design News webinar next week.

Jerry Cogswell

78RPM
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Re: #240 MEMS Microphone
78RPM   7/12/2013 4:46:20 PM
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William K, I discovered that you can get to the build instructions by clicking on the link above the one you probably selected. Go to the most recent Gadget Freak column and look at the links to other Gadget Freak blogs in the right column. Click on #240 and you should get the link that has build instructions.

William K.
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Re: #240 MEMS Microphone
William K.   7/14/2013 9:53:15 PM
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78RPM, thanks for the clues. I have often been frustrated in my attempts to get infomation about the gadget freak projects. The useful details have always appeared to be withheld, so usually I just abandin the effort to get any details.

78RPM
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Platinum
Re: #240 MEMS Microphone
78RPM   7/14/2013 10:52:46 PM
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glad we both figured it out.

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