erakii.org

 This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control to allow it to be very sensitive to low sound levels but it increases its range 20dB for loud sounds. Link

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• 29/07/2010 15:07 - DIY Room Noise Detector
• 22/11/2009 17:47 - การเลือกหอพัก
• 10/08/2009 21:24 - 12 Volt DC Noise Filter for Car
• 27/07/2008 15:20 - Room Noise Detector

• 15/02/2009 21:51 - Bumped Die Production (WLCSP)
• 12/02/2009 17:36 - Park-Aid
• 11/10/2008 04:10 - DIY WIFI Robot
• 08/09/2008 19:03 - 150W MP3 Car Amplifier
• 22/08/2008 07:44 - Potato Cannon

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