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Old 03-28-2009, 01:23 AM #1
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Default Microphone questions

Hey,

Does anyone know how to hook up a microphone between two things so the microphone will limit how much voltage goes to one of the things? And does anyone know where to get some small cheap microphones?


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Old 03-28-2009, 03:10 AM #2
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Default Re: Microphone questions

cheap enough:http://www.sparkfun.com/commerce/pro...oducts_id=8635
i don't know about that maybe some sort of micro transformer
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Old 03-28-2009, 03:15 AM #3
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Default Re: Microphone questions

I don't understand you're purpose. Why are you trying to use a mic as a voltage controller?
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Old 03-28-2009, 03:16 AM #4
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Default Re: Microphone questions

For mcrophone or other electronic stuff at a good price and fast shipping, I recommand digikey.com . They have really good service. As for your first question, *a microphone creates an electrical signal, so transforming this into some sort of resistance is not easy. Could you use a pressure sensor instead? It works by varying resistance, well I think so. *That's the best answer I can get you, or maybe you can try plugging the mic into an amp to generate a more powerful electric signal that should variate just like if you had a mic acting as a resistor.

I'm not a pofessional in electronics, but I've been assembling lots of them as a hobby in my basement, so I understand somewhat how they work
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Old 03-28-2009, 03:30 AM #5
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Default Re: Microphone questions

http://www.laserpointerforums.com/fo...num=1234087815

Thats why.

Thanks jamilm ill look into it..and ill take a look at digikey too

Im not quite sure what he did to get it controlled by audio but i thought the microphone was the easiest way to. He said, "and the tilt axis drives pretty good with a couple tenths of a watt of audio from my amp" Anyone know how i could hook that up with my amp? I am just trying to get it so it will be "sound-responsive"

Thanks
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Old 03-28-2009, 03:51 AM #6
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Default Re: Microphone questions

The scanner will work like a speaker, vibrating for side to side from the inversing magnetic field. From what he said, I think you should try getting a 1 channel audio amp at 1 or 2 watts and plug as an input a microphone and as an outpout the coil.
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Old 03-28-2009, 02:15 PM #7
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Default Re: Microphone questions

maybe if you connect the microphone to a transistor some how.
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Old 03-28-2009, 02:22 PM #8
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Default Re: Microphone questions

Google "microphone pre-amp kit". They are about $10 if I remember correctly and come with all the parts, (including microphone) and full instructions.

Regards rog8811

[edit]Hmmmm I have just googled it myself and cannot find the one I used, it was very small, around an inch cube.....[/edit]
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Old 03-28-2009, 02:23 PM #9
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Default Re: Microphone questions

Quote:
Originally Posted by The_Muffin_Man
http://www.laserpointerforums.com/forums/YaBB.pl?num=1234087815

Thats why. *

Thanks jamilm ill look into it..and ill take a look at digikey too *

Im not quite sure what he did to get it controlled by audio but i thought the microphone was the easiest way to. He said, "and the tilt axis drives pretty good with a couple tenths of a watt of audio from my amp" *Anyone know how i could hook that up with my amp? *I am just trying to get it so it will be "sound-responsive"

Thanks
What you need in an amplifier that can drive a coil (like a speaker)....
here is a Data Sheet of the 8 pin LM386 Low Voltage Audio Amplifier with some application
circuits you can try... This will give you what you want.. 8-)

http://www.biltek.tubitak.gov.tr/gel...ar/6/LM386.pdf

[Edit] or you can do like Rog suggested....(posted at the same time again... ;D)


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Old 03-28-2009, 02:53 PM #10
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Default Re: Microphone questions

Quote:
Originally Posted by rog8811
Google "microphone pre-amp kit". They are about $10 if I remember correctly and come with all the parts, (including microphone) and full instructions.

Regards rog8811

[edit]Hmmmm I have just googled it myself and cannot find the one I used, it was very small, around an inch cube.....[/edit]
Hey Rog...
I found this one..... 8-)

http://store.qkits.com/moreinfo.cfm/FK647

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Old 03-28-2009, 02:57 PM #11
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Default Re: Microphone questions

Quote:
I found this one.....
That looks like it! I have just noticed I have google set to UK search.... :

Regards rog8811
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