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Walt wrote: I read somewhere that the human ear can detect impulses that, if they were a sustained waveform, would be well above 20 kHz and possibly into the 30 kHz range. Apparently this phenomenon

From: "Rich Peet" <richpeet@...>

Hello to all. I am a new member, and have some thoughts. So far I've built some ribbon and LD tube mics. Last night, just out of curiosity I took apart electret capsule. It consist of diaphragm,

ognelson@... wrote: You ear's diaphragms might be suffering from waxy buildup, but the killer damage is to the coclear hair cells. Also, the hearing part of your brain adapts to physiological

ognelson@... wrote: There's definite decay of permanent charge in electret which might be reason for your problem. Indrek -- Indrek Rebane | Borthwick-Pignon Electronics Engineer | Tartu

Hey all-- This reminded me of a question I meant to ask long ago: is the response/performance/accuracy of a mic/diaphragm affected by lots of use at high spl's over time, as the diaphragms in my ears

Hi Bob! Got mine at DigiKey, just type EM8050U-514 into the search doohickey. A. Einstein

My final summary and input. If the desire is to win on a low cost design over the wm60. The universal request is lower noise not cost on a capsule. Because the low noise caps currently on the market

dayVel wrote: Where can these be ordered? Thanks, Bob -- "Things should be described as simply as possible, but no simpler." A. Einstein

I think 3 pin w/FET based on the WM-61A103 is the way to go. I really like the the 3 pin design because not only does it make the Linkwitz mod easier, but also common-source with a source resistance

Indrek Rebane wrote: So it is monotonic in R_h in its simplest form. I stand corrected. Thanks, Bob -- "Things should be described as simply as possible, but no simpler." A. Einstein

There is some combing effect in a large diaphragm mic, but it is very small due to the fact that there is only one diaphragm. When sound pressure strikes the diaphragm, the entire diaphragm moves as

Bob Cain wrote: http://www.phys.unsw.edu.au/~jw/Helmholtz.html Explains it all clearly. Simplifying equation for microphone construction: f = (v*R_h)/(2*pi*R_c*sqrt(H_h*H_c) where: v - speed of sound

Yes PZM patents have expired sometime ago. Trademarks don't expire, so don't refer to something commercially as someone else's trademark. I see some pretty lame microphhone patents such as a patent on

Rich Peet wrote: Can confirm it. Extremely valuable information for any DIY enthusiast. Lots of great ideas. Lots of businesses gone bust. Another valuable patent search link: http://ep.espacenet.com/

Dick Campbell wrote: And how! Thanks, Dick. That's a keeper. Bob -- "Things should be described as simply as possible, but no simpler." A. Einstein

I wrote: This was off the top of my head thinking that the hole is the damper, or air flow resistance to the cavity's acoustic spring. Increase the resistance, and the energy stored in the spring

resonance frequency. performance -- dunno. know the equation? My advice is to not mess with the hole in the front cavity. The properties of the acoustic circuit in front of the diaphragm is used to

when i was using really cheap capsules (abut 10 cents each in india), i used to grind off the front plate, very carefully, and it improved the hf response of the 6 mm capsules i was using. never tried

Okay, I think I understand what you are saying. However, I wonder why this is a problem with an array but not a single element? Wouldn't the reflected, off axis, time delayed sound also create a