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Permalink Reply by jawbone on March 21, 2015 at 2:21pm

Cool - gotta try it tomorrow - If I was to put some in my git I guess you could always run a line back from the amp or run a little amp inside - just thinking out loud. Can anyone explain why it works?? And it has been mentioned could a piezo in the circuit act as a sort of switch??

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Permalink Reply by turtlehead on March 22, 2015 at 3:58am

You still need that LED circuit posted above in order to get the light to turn on and off with the music.  The transistor is the switch. The preamp is there to boost the audio signal enough to trigger the transistor to switch the LED on and off. 

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Permalink Reply by turtlehead on March 22, 2015 at 3:35am

So I got it working with an lm386 feeding it.  This is very close to the circuit I used.  Just replace the speaker with our little LED circuit and it should light up from a piezo guitar.

I added a resistor between the battery and the LED for protection and I'm running everything off a 9v battery.  I had 3 LEDs running at one point - green, yellow, red, and almost had a VU meter effect.

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Permalink Reply by jawbone on March 22, 2015 at 4:06am

OOOOhhhhh - this could be fun !!!!!  A fun rainy day project !!

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Permalink Reply by turtlehead on March 22, 2015 at 4:11am

Yep jawbone tons of fun.  That reminds me to get out in the sunshine for a while today!

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Permalink Reply by jawbone on March 22, 2015 at 5:53am

Hey Turt - are the multiple LED's wired in series or parallel ??

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Permalink Reply by turtlehead on March 22, 2015 at 6:10am

I did it both ways.  Series had all the lights switching at the same time like in the sunglasses.  Parallel was giving me some of that meter effect until I blew out a couple LEDs because I was swapping out resistors to try to increase the effect.  That's where I got lost. 

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Permalink Reply by jawbone on March 22, 2015 at 7:14am

Oh sure - never happy 'til there is smoke and sparks !!!!  ;-)

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Permalink Reply by Mungo Park on March 22, 2015 at 2:07pm

This may work for the non builder:

 Course it is sound sensitive not vibration

http://www.ebay.com/itm/Lights-Sound-Activated-LED-Music-IR-Control...

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