Class D Audio Amplifier Hardware Design - Phil's Lab #125

[SUPPORT]

[GIT]

[SOCIAL]

[LINKS]

[TIMESTAMPS]
00:00 Intro

00:27 PCBWay and Git Repo

01:01 Class D Amplifier Basics

05:25 IC Choice
07:36 Schematic
16:18 PCB

22:51 'No Load' Test
25:18 Guitar Demo

26:57 Outro

[PhilsLab]

Thanks for watching! Next video well be a full KiCad 7 + STM32WB Bluetooth design!
Any project ideas (similar size to this Class D board) that you would like to see?

[Djambo]

You really made a half hour video just so you can show off your guitar skilles at the end xD I really liked the design, learnt a lot!

[sindotj]

Not only you can design the board, but also you can play guitar nicely. Gifted.

[madrigo]

Kinda late to the party but just wanted to say: Always a delight to see a notification from your channel Phil. Great as always. More audio projects please! haha can't get enough. Cheers!!

[DavidMcCurley]

Super interesting video. Impressed with the results and the demo at the end. Thanks!

[NiliMoto]

Man, the timing of this video is incredible. I just thought about giving pcb design another shot and you happen to have a new video on exactly what i wanted to do.

[RobertGoldansky]

Big fan of the Youtube channel and keep going with the experiments. We could easily replace guitar amplifiers with class D technology as the closed loop bandwidths can go up to 120Khz or more. Then its just a matter of maximizing the performance of the design along with the X-Y transformer/amplifier hysteresis. Then you go further on to decide how many switching levels you want, what switching speed your targeting for, and filter options such as post filter feedback..etc..

That is how I went down that rabbit hole :D

[larcomj]

Ive been following your channel for a few years now(as an EE ive picked up quite a few tips) and as an music/audio lover im always stoked to see these videos. Many thanks Phil, cheers!

[nil]

Have recently designed a DC switch power supply useing your vids as baseline advise and it turnd out pretty ok for a first time using kicad for PCB

Lovs your vids man
keep it up

[nollb]

I never thought much about it but I guess an 89 dB s/n ratio for a power amp is quite normal irrespective if it's class AB or D or whatever? Certainly it makes you think a bit about fretting about material being captured at 16 bits as opposed to 24 bits..

Nice guitar work in the end :) i used to play with Yngwie in the 80s (played keyboards on the first five or so rising force albums)

[Samsul]

I guess the most precious about audio design is the technique of laying out the pcb tracks in order to reduce unwanted interference to the maximum

[buzztoneaudioeffects]

Im already in admiration of you EE/PCB design knowledge but hearing you shred at the end! Wow, you have my dream skill set 😂

[DIYHiFi]

Hell yeah, SHRED!
As usual great, informative video!
Good to see you QA403 arrived. Mine should be here this month :)

[zapo]

I really enjoy watching your hardware design videos! Especially the easy to understand schematics, layouts and explanation are fantastic. Your videos have helped me boost my knowledge about electronics alot and got me some internships where i was able to useethat knowledge and show off my altium skills. Thank you so much!

[ishonk]

Thanks for sharing!
Maybe not so critical for a guitar amp, but interesting nonetheless: TI Paper "Selecting Capacitors to Minimize Distortion in Audio Applications" (Zak Kaye), describing how a cheap X5R input cap on these class D amp chips can create 30+ dB more THD+N instead of a through-hole film cap. Depends on frequency and other parameters of course, but highlights details that distinguish an audiophile amp from a standard amp.

[senseless]

🤘 you are coolest! When I grow up I want to be you 😂
Your videos are a great resource for education and love the way you play guitar

[wodddj]

I use a TPA3116 as a stereo power amp, which follows an ME-80 signal processor, so far it worked nicely. The only downside is with 50W of power, it's simple not lound enough. Looking at some discrete design now.

[CraigHollabaugh]

Excellent coverage. I followed along while looking at datasheet. Your layout is much tighter than TIs, good job here. You've opted for a different thermal relief strategy based on experience 👍. The sheet says in 7.3.7, "In a single-ended input application, the unused input should be ac grounded at the audio source instead of at the device input for best noise performance." Not really possible with a guitar/pedal combo with various grounds floating around. Thanks for the video, I'll start using pours more often than wide traces.

[mafhper]

Thanks for the tips and the great solo!

[rolfdieterklein]

Great video thanks, also the usage of the QA403 - mine still on backorder, hope getting soon.