Note that a "standard" 3-wire battery box may or may not power this thing correctly.
Or, it may appear to power it, but only at moderate sound levels. I built this circuit for the past (two?) units that I sold here.
It sounds like Chris has "4.7k" or otherwise modded the capsule itself to work with "two wire" battery boxes. A nice idea IMO.
Richard
Thanks Richard, I'm going to check that out.
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Richard,
I don't have a battery box built or handy...but I did a test with a preamp.
I did the test running a mic ~2 feet from a BIG Cerwin Vega speaker powered by a Crown amp at 50% vol.
That is VERY loud !!! Especially at that close of a distance.
I was using a CA-9100 w/ no filtration.
I ran that into a Sound Devices HX-3 in MONO mode into a Roland R-05 (monitored w/ Sony MDR-7509HD cans)
The gain was around ~40% on the Church pre and ~30% gain on the SD HP amp, Roland R-05 gain @ 10 with good strong peaks.
NO DISTORTION ! clean full sound.
no issues, as expected.
I'm not sure what think the problem would be...it's fine with a 9V. pre.
Would it that much different with a BB ?
I believe in a pragmatic approach. I did the testing, and it sounds great.
Here are the pics of the test setup, and a random 2 min clip of a P-Funk SBD from 1978
I recorded at the levels I stated before.
test clip is wave 44/16http://www.megaupload.com/?d=58QFCZ4Uhere's the complete show for comparison >
http://www.thetradersden.org/forums/showthread.php?t=90656