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Help with a small amplifier, microphone, and small transducers

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FloydV

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Hi,

I'm new to the site, so hello.

This is what I want to build. A set of earmuff style hearing protectors (used with firearms) that has a very small, simple amplifier which attaches to an external microphone and passes voice communication.

The only unique thing would be that there needs to be a circuit which will clip gunfire. The idea is allow normal conversation with momentary loud noises removed or greatly reduced.

Such hearing protectors are available for $300 to $400, which is ridiculously over priced.
 

A clipper is an easy device its just a pair of diodes that conduct at a certain threshold so stopping the signal getting any bigger. The problem is that the gunfire would be limited to the same level as the loudest speech, - too loud? A better way would be to use a noise blanker. You look at the rate of rise of the audio waveform and if its too fast, this rising edge triggers a monostable which "switches off" the audio for a certain time, say .5 secs? Google for "noise blanker".
Frank
 
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    FloydV

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chuckey said:
A clipper is an easy device its just a pair of diodes that conduct at a certain threshold so stopping the signal getting any bigger. The problem is that the gunfire would be limited to the same level as the loudest speech, - too loud? A better way would be to use a noise blanker. You look at the rate of rise of the audio waveform and if its too fast, this rising edge triggers a monostable which "switches off" the audio for a certain time, say .5 secs? Google for "noise blanker".
Frank
Click to expand...

Thanks! A blanker would be ideal. .5 seconds sounds right to me.

Is there a place on the forum that has schematics for a blanker? Perhaps one for a small amplifier? I can etch circuit boards, and I'm a fair hand with a soldering pen, but I don't really know where to find schematics. Also, does this forum have sponsors who sell parts?

Floyd
 

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