Any Suggestions? - Electronic Circuits Projects Diagrams Free

Cyclone · 8th March 2003, 09:43 PM

Hi,

I am trying to build a sound sensor for my Lego RCX. If i hook the mic to the rcx inputs directly its not sensitive enough I practically have to blow as hard as i can on the mic to get the values to go up.

I am looking for some sort of circuit that would amplify these values so that I can tell my RCX to do something via sound from a reasonable distance.

any suggestions? Thanks

arcom · 8th March 2003, 09:55 PM

What you need is a microphone preamplifier.
Here are few (depending on what mic you have):
http://www.mitedu.freeserve.co.uk/Ci...io/ecmmic.html
http://www.mitedu.freeserve.co.uk/Ci...o/compmic.html
http://www.mitedu.freeserve.co.uk/Ci...ic/dyn_mic.htm
http://users.auth.gr/~mixos/projects.../006/index.htm
http://users.auth.gr/~mixos/projects.../024/index.htm

Cyclone · 14th March 2003, 01:14 AM

thanks. well i tried a few circuits and they don't seem to work properlly. does anyone have any other ideas or circuits like this only using 9 volts or less?

I have this toy robot kit that i built it has an electritet mic and its electronics are only built using transistors,capacitors and resistors! and it runs on only 2 double AA Bateries.

I am looking for a circuit like the one in the bot. thanks!

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8th March 2003, 09:43 PM	(permalink)
Cyclone	Any Suggestions? Hi, I am trying to build a sound sensor for my Lego RCX. If i hook the mic to the rcx inputs directly its not sensitive enough I practically have to blow as hard as i can on the mic to get the values to go up. I am looking for some sort of circuit that would amplify these values so that I can tell my RCX to do something via sound from a reasonable distance. any suggestions? Thanks

8th March 2003, 09:55 PM	(permalink)
arcom	What you need is a microphone preamplifier. Here are few (depending on what mic you have): http://www.mitedu.freeserve.co.uk/Ci...io/ecmmic.html http://www.mitedu.freeserve.co.uk/Ci...o/compmic.html http://www.mitedu.freeserve.co.uk/Ci...ic/dyn_mic.htm http://users.auth.gr/~mixos/projects.../006/index.htm http://users.auth.gr/~mixos/projects.../024/index.htm

14th March 2003, 01:14 AM	(permalink)
Cyclone	thanks. well i tried a few circuits and they don't seem to work properlly. does anyone have any other ideas or circuits like this only using 9 volts or less? I have this toy robot kit that i built it has an electritet mic and its electronics are only built using transistors,capacitors and resistors! and it runs on only 2 double AA Bateries. I am looking for a circuit like the one in the bot. thanks!