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#1
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Rumbling SD condenser mic problem
Hi all,
I have a Behringer B-5 condensor mic, long out of warranty, that has developed a 'stomach rumbling/rolling thunder' sound behind the audio, which peaks erratically every 5-10 seconds as a 'shorting/fizzing' sound that drives the signal into the red. The audio itself is not distorted, but fails to mask the rising background rumble. It does this no matter whether the omni or cardioid capsule is fitted, in fact even does so when no capsule is installed. Since I have little to lose by investigating the innards, what components would you suggest I test or replace in a repair attempt....it's a "cheap-end" mic after all ! Thanks, Ray |
#2
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Rumbling SD condenser mic problem
Ray Thomas wrote:
I have a Behringer B-5 condensor mic, long out of warranty, that has developed a 'stomach rumbling/rolling thunder' sound behind the audio, which peaks erratically every 5-10 seconds as a 'shorting/fizzing' sound Probably an electrolytic capacitor but it could be a bad solder joint. Not a chance of getting a schematic of it, so you'll just have to draw one out yourself. Shouldn't be too hard as long as you can get it open in a way that will let you put it back together. There aren't going to be a lot of parts in there. -- If you e-mail me and it bounces, use your secret decoder ring and reach me he double-m-eleven-double-zero at yahoo -- I'm really Mike Rivers ) |
#3
Posted to rec.audio.pro
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Rumbling SD condenser mic problem
Ray Thomas wrote:
I have a Behringer B-5 condensor mic, long out of warranty, that has developed a 'stomach rumbling/rolling thunder' sound behind the audio, which peaks erratically every 5-10 seconds as a 'shorting/fizzing' sound that drives the signal into the red. The audio itself is not distorted, but fails to mask the rising background rumble. It does this no matter whether the omni or cardioid capsule is fitted, in fact even does so when no capsule is installed. Since I have little to lose by investigating the innards, what components would you suggest I test or replace in a repair attempt....it's a "cheap-end" mic after all ! It's contamination. Disconnect the capsule from the electronics... if the noise goes away, it's gunk inside the capsule or on the insulating ring of the capsule. If the noise stays, first hit the board with flux remover, then try shorting the FET gate to ground. If the noise still stays, replace the FET. If the noise goes away, look for stray fingerprints on the leak resistor or a leaky input cap. If they used a film cap, fingerprints on the film will do it too. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
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Rumbling SD condenser mic problem
On Fri, 31 Oct 2008 18:26:49 -0400, Ray Thomas wrote
(in article ): Hi all, I have a Behringer B-5 condensor mic, long out of warranty, that has developed a 'stomach rumbling/rolling thunder' sound behind the audio, which peaks erratically every 5-10 seconds as a 'shorting/fizzing' sound that drives the signal into the red. The audio itself is not distorted, but fails to mask the rising background rumble. It does this no matter whether the omni or cardioid capsule is fitted, in fact even does so when no capsule is installed. Since I have little to lose by investigating the innards, what components would you suggest I test or replace in a repair attempt....it's a "cheap-end" mic after all ! Thanks, Ray Maybe junk on the diaphragm. Connect it, and exhale slowly into it. If it sounds like a distant thunderstorm afterwards for a while, you have junk on the diaphragm that's become conductive with or above a certain humidity level. Overly humid environment? Drying the mic out with dessicants (sp?) in a sealed bag might be all you need. Regards, Ty Ford --Audio Equipment Reviews Audio Production Services Acting and Voiceover Demos http://www.tyford.com Guitar player?:http://www.youtube.com/watch?v=yWaPRHMGhGA |
#5
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Rumbling SD condenser mic problem
Ty Ford wrote:
Maybe junk on the diaphragm. He did say that he heard the same noise with either capsule. They could both be cruddy, but the odds are better that the problem is with the guts. Could be dirt and moisture on the circuit board along an ultra high impedance path, it could be the contact point for the capsule, or it could be a faulty component on the circuit board. -- If you e-mail me and it bounces, use your secret decoder ring and reach me he double-m-eleven-double-zero at yahoo -- I'm really Mike Rivers ) |
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