Beat LED

[frankwas]

Hi All.

Does anyonw know of a schematic out there that will make a LED flash to the beat of the music? I'm building a sound system in my car and I want to make led's flash to the bass beat from the subwoofers.

Regards,

Francois.[/code]

 

[niq_ro]

a simple schematic use 2 resistors, one LED and a transitor :wink:

 

[frankwas]

Thanks.

Just one question: What transistor do I use?

 

[niq_ro]

any NPN transistor, eg: BC107, 2N2222, BD135, 137, 139

 

[McGuinn]

You would be well advised to add a low pass filter and a voltage divider on the input of the transistor. Otherwise the signal strength may cause the LED to remain on. A low pass filter will only allow the low end bass sounds through, but in doing so, you may need to amplify the stage somewhat.

 

[vaineo]

if you do a search for a color organ that might be something of interest