[Lab] "listening" to high volume using an electret microphone

Tue May 6 16:56:33 EDT 2014

In that case just be a bit cautious as different materials affect
different frequencies. I am currently working on a home theater and had
recently looked at acoustic insulation which has specs published and in
some cases even validated by a 3rd party. In most cases it will
attenuate 150 Hz at a much different rate than 2000-3000 Hz. In
other-words bass will be less likely to be attenuated than higher
frequencies. 

Still worth a shot though. Good luck 

On 2014-05-06 4:35
pm, Justin Slootsky wrote: 

> Thank you! This is a good option as well.

> I don't have a high requirement for accuracy, I'm just breaking it
down into 7 frequency bands (using the MSGEQ7 chip) and displaying
those. A small case for the microphone might be a great answer. 
> 
>
-------------------------
> 
>> FROM: dave at huntgang.com
>> TO:
lab at artengine.ca
>> SENT: Tuesday, May 6, 2014 4:34:14 PM
>> SUBJECT:
Re: [Lab] "listening" to high volume using an electret microphone
>> 
>>
Thinking outside the box (or microphone in this case) what about
attenuating the sound before it gets to the microphone? ie using
something like insulation around the microphone to reduce the sound
level? Could be a very simple solution, not sure what type of accuracy
you are looking for. 
>> 
>> On 2014-05-06 4:24 pm, Peter Sjoberg wrote:

>> 
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>>> On
05/06/2014 12:45 PM, Richard Sloan wrote:
>>> 
>>>> pot on output will
just limit the now clipped signal, need to adjust the gain of the amp
itself, so the output never clips.....
>>> 
>>> I kind of wonder what
the electret microphone can handle. Did see the
>>> datasheet but don't
know how to convert 85dB sound pressure (or whatever
>>> you expect to
get) to something on the datasheet but it must be a max
>>> somewhere.
If you hit that max it doesn't matter what you do at opamp
>>> level,
it's already clipped before it hits it.
>>> 
>>> /ps
>>> 
>>>> On Tue,
May 6, 2014 at 10:13 AM, Justin Slootsky <justin at slootsky.org
<mailto:justin at slootsky.org>> wrote: Yes, at the 40db setting, it still
drives too high. Maybe I should just put a pot on the output and see how
that goes.
------------------------------------------------------------------------
*From: *"greg atcheson" <greg.atcheson at gmail.com
<mailto:greg.atcheson at gmail.com>> *To: *"Justin Slootsky"
<justin at slootsky.org <mailto:justin at slootsky.org>> *Cc: *"lab"
<lab at artengine.ca <mailto:lab at artengine.ca>> *Sent: *Tuesday, May 6,
2014 9:46:27 AM *Subject: *Re: [Lab] "listening" to high volume using an
electret microphone Have you tried using the other lower-gain setting
jumpers mentioned in the link? If it was a standard opamp I'd say put a
potentiometer in for the gain and you can adjust it. On May 6, 2014 8:10
AM, "Justin" <justin at slootsky.org <mailto:justin at slootsky.org>> wrote:
I'm working on a "light organ" type project, and I tried this
http://adafru.it/1713 [1] and it worked great until I got to high home
stereo volume, then everything was maxed out. Since my target
environment is an indoor concert venue, I need to use something with
less amplification. I have a bare electret microphone, but I'm having
trouble finding information on how to use it in a high volume
environment. Does anyone have any links or suggestions?
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