Most VU Meter designs use ether a cascade of op amps or an LM3289 LED Bar graph driver. For a low part count simple VU meter Schmitt Triggers are the way to go. For n LED’s it only uses n resistors n/6 DIP’s 1 capacitor optional 1 diode optional and of course n LED's Op amps work grea...By: jazzzzzz
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Source: http://www.instructables.com/id/Schmitt-Trigger-VU-Meter/
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