Digital LED VU Meter | Using Op Amps | Part 1

This video demonstrates the learning process as I tinker with Op Amps (operational amplifiers). I describe an overview of this (not-currently functional) project using the LM358 Op Amp, which amplify the signal from a electret microphone, and use an envelope follower circuit. The second part of the circuit uses a resistor ladder and LM324 Op Amps to set up thresholds for a series of comparator circuits. These assess the sound intensity and determine how many LEDs should light up. Modifications are discussed and hopefully part 2 will have the demonstration of the fully working VU meter.

00:00 - Introduction of this Video
00:41 - Introduction of the Circuit
2:31 - The LM358 Op Amp Circuit
5:56 - Segue: Voltage Dividers (ends 9:57)
13:30 - LM324 Op Amp Circuit
24:42 - Demonstration
28:24 - Conclusion