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Old 31st May 2003, 01:28 AM   #1
zmoz is offline zmoz  United States
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Default Stupid question...LED sound level?

Ok...I've got a stupid question for you. I recently got a 3pc speaker system for my computer...two satellites and a sub. I would really like to modify them to add an LED sound meter...I'm not sure what they're called, but a line of LEDs that light up according to the sound. I'm sure you know what I'm talking would I go about doing that?
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Old 31st May 2003, 01:37 AM   #2
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If you would like to add a visual output display, there are many options available! Even Radio Shack sells inexpensive bar-graph LED displays with dual inline packages.

First time I wanted such a toy, I had to build a series of A-D convertors on the breadboard, plus a set of display drivers. Today, just look up a kit like this:
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Old 31st May 2003, 01:51 AM   #3
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here is a simple one you could make

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Old 4th June 2003, 04:43 AM   #4
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the q-kits is still done with discretes.- surprising
guess the LM3915 isa still relatively expensive $3usd
TI used to make a semi equivalent which was dirt cheap
varta lviv
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