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

Tue May 6 16:35:45 EDT 2014

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. 

----- Original Message -----

| 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 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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