6W amplifier part 1 - Intro, waveforms, schematics and detailed explaination

Link to pt.2:    • 6W amplifier part 2 - preparing for a...  

Hi everyone, in this video I'm showing you how I've built my own, well sounding, amplifier. I've built a first version some years ago since I didn't have a stereo in my bedroom and I didn't like how my Bluetooth speaker sounded, but that first, too simple, design had some flaws and it eventually broke. Here's an improved version, with some biasing circuitry to get rid of the crossover distortion and with Darlington pairs at the output to make a bit easier the job of the operational amplifier. In this video you'll see a thorough explanation of how does my amplifier work and in the next ones you'll see how I'll make some further upgrades and how I'll hopefully be able to fit everything inside the plastic box.

Schematics PNG:
https://drive.google.com/file/d/1j44s...

Schematics .asc file:
https://drive.google.com/file/d/1uBXF...

0:00 Intro
1:20 What in the next videos?
4:18 Hardware tip
6:06 The handy class D amp IC I've found
6:34 Output waveforms comparison
8:18 The output power
9:50 The schematics' description
15:31 The crossover distortion
18:25 Biasing methods
20:23 The biasing circuitry
23:25 Bias with diodes ft. Alvin n' the Chipmunks :P
24:20 The thermal runaway
26:35 The bias current value
27:15 OpAmp Vs Distortion, OpAmp wins
30:47 Outro