sound sensitive LEDs - diyAudio
Go Back   Home > Forums > General Interest > Car Audio
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 19th November 2007, 01:41 AM   #1
diyAudio Member
Join Date: Nov 2007
Send a message via AIM to JoeKnowsBasebal
Default sound sensitive LEDs

i'm a noob here. i know a little about electronics cause i used to install car audio/video/alarms, but i don't know all the equations for the electronics or anything like that. basically i know resistors and wire guages.

anyways... i want to wire a few (2 or 3) LEDs into my car that get brighter as i rev up my motor. i want to place them inside the hood scoop on a Camaro SS. I've wired LEDs in a car before, but i've never done a sound sensitive wiring. I want them to get brighter as the engine gets louder.

what are the parts i need and maybe a simple wiring diagram to help me out. just let me know the part names (like the device that recognizes louder or softer sounds) and maybe how much voltage i should have running through everything.

thanx in advance.
  Reply With Quote
Old 19th November 2007, 02:13 AM   #2
diyAudio Member
Join Date: Nov 2004
Location: sk
Send a message via AIM to ocool_15 Send a message via Yahoo to ocool_15
If you are just wanting it to work off a mic look up lm3915, lm3916 Ic's. There are kits based on those chips that should do what you want.
  Reply With Quote
Old 19th November 2007, 03:58 AM   #3
diyAudio Member
zigzagflux's Avatar
Join Date: Oct 2006
Location: Charlotte, NC
Would seem easier, simpler, and cheaper to use a tach signal, and use a frequency to voltage converter to light your LED's.

Mics are relatively expensive in comparision, and won't work very well under the hood, IMO.
  Reply With Quote
Old 19th November 2007, 04:13 AM   #4
diyAudio Member
Join Date: Nov 2007
Send a message via AIM to JoeKnowsBasebal
can i get those at a store like Radio Shack or would they have to be ordered off the internet?
  Reply With Quote
Old 19th November 2007, 06:05 AM   #5
diyAudio Member
Join Date: Nov 2007
Send a message via AIM to JoeKnowsBasebal
i'm still thinking about going the mic route. does anyone have a part number for a small mic that i could use with an LM3915 IC?
  Reply With Quote
Old 19th November 2007, 10:39 AM   #6
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
The LM391x ICs are bar graph drivers and would be a good choice if you want to light more LEDs at higher volume. If you only need to make a group of LEDs brighter, you could use a mic to drive a simple amplifier circuit. The amplifier would make the LEDs brighter as the volume increased.

I don't know if this would work well without filtering. The mic would pick up any sound. Going down the highway, wind noise would make the LEDs light up.

Digikey has large selection of condenser mics that will work.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Touch sensitive sound modulation New2Electronics Everything Else 2 13th April 2009 03:28 PM
very sensitive speakers NED 209 Full Range 7 15th January 2008 05:54 AM
PCM1702 sensitive to ESD? klitgt Digital Source 11 14th February 2006 05:22 AM
Trade my blue LEDs for White LEDs CaliforniaBob Swap Meet 7 26th March 2004 07:28 AM
WTT: Blue LEDs for Red & Red/Green LEDs CaliforniaBob Swap Meet 2 9th June 2003 02:58 PM

New To Site? Need Help?

All times are GMT. The time now is 08:13 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2