This week we make a simple VU meter using an Arduino.  We take audio input from either a microphone or a line level input and use a small transistor to amplify the signal, add some leds and some basic code to create a VU meter that has a switchable…

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This week we expand on shift registers from last week and add another chip to demonstrate how you can daisy chain them to control more things with the same 3 pins off of the Arduino.  Oh, did I mention that I have a special guest on the show tonight? …

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