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Microphone questions

T

The_Muffin_Man

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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?


Thanks
 





HumanSymphony

HumanSymphony

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I don't understand you're purpose. Why are you trying to use a mic as a voltage controller?
 
BuildAbluraylaser

BuildAbluraylaser

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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 :)
 
T

The_Muffin_Man

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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
 
BuildAbluraylaser

BuildAbluraylaser

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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.
 
jamilm9

jamilm9

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maybe if you connect the microphone to a transistor some how.
 
rog8811

rog8811

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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]
 
lasersbee

lasersbee

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The_Muffin_Man said:
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
Click to expand...
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.. :cool:

http://www.biltek.tubitak.gov.tr/gelisim/elektronik/dosyalar/6/LM386.pdf

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


Jerry
 
lasersbee

lasersbee

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rog8811 said:
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]
Click to expand...
Hey Rog...
I found this one..... :cool:

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

Jerry
 
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