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Project #1 - Ambisonic Microphone - Exp2 |
When I built the first version of my ambisonic microphone
in the Spring of 2008
(Soundscapes),
I had no clue where that project would lead. Now I am
building a revised version which fixes some of the issues
that surfaced with the first: a smaller preamplifier
enclosure greatly enabled by a printed circuit board for
each of the 4 preamplifiers, an easy and repeatable way
to change gain settings, increase the sound pressure level
ceiling, a single quad cable instead of 4 individual cables,
and, hopefully, power the microphone with phantom power to
eliminate the batteries in the preamp box.
For this project, I presented the development version, a monaural system with one microphone and one preamplifier. The system was powered with two 9-volt batteries. For proof of performance, I played a recording of one of my cats meowing and the quarter hour strike of my pendulum clock, similar in style to the introduction of my original microphone in Soundscapes, and a recording of the midnight traffic on IH35 passing through Austin. In the presentation, I displayed the original microphone and preamplifier to compare to the second generation electronics. |
Top and bottom side of printed circuit board while
the circuit is battery powered and in the tweaking stage.
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