Class D audio amplifiers - How they work

Part 3 of the "Introduction to Audio Amplifier Classes" series.
Thank You!

[antiquephotographyodedlevy]

Dear John thanks for your videos you are really great ❤

[digitalfons]

Very nice informative video about class d .hopefully we see a practical circuit on your working bench soon

[diymaster]

I was just learning about class h so the next video will be really useful for me Thanks for all the information you put in these videos.

[pcfred]

I think we need a video about what ever happened to Class E and F amplifiers.

[andymouse]

You can't put it better than that !...cheers.

[mikevincent]

Your instruction vids are great. I really enjoyed your long tailed pair / differential pair one a while back

[VIPINSAINI_]

Nice
Easy to understand your explanation for Class-D

[fullwaverecked]

A confusing subject for me. Thanks for lifting the fog. Cheers!

[miks]

I'm a fan of class D amps, they sound as good as class A if you layout the board well and use proper ground planes, you also do not need a big power supply to achieve high volume.

[anurasenarathna]

Clear explanation. Thank you very much.

[HazeAnderson]

I recently purchased an HDMI microscope for micro soldering, but I also use it for through hole soldering as my eyesight is extremely poor. So far I have actually SMD to be easier to work with ... now that I have the proper tools. But my point is, if your eyes are like mine, using a tool like an HDMI scope not only gives me better vision but also always me to sit away from the circuit in comfort. :) I guess the downside is I am now dependent on it ...

[ferrumignis]

Clive Sinclair (of ZX80/81 fame) first sold his "X-10" Class D amplifier module in 1964. They were very unreliable though, early germanium transistors, no output filter and some bad quality control issues.

[gkdresden]

Today there are class D amplifier modules available, which can outperform class AB amplifiers without problems. F.i. the 80AM2 from ICEPower is a dual channel class D audio module with 2 x 80 Wrms with a THD+N of 0.003% a TIM of 0.0035% and a S/N of 110 dB. These parameters are also hard to achieve for class AB amplifiers. These modules work with a different PWM technology. They sum the triangle signal with the audio input signal and use a zero detector to switch the pulse on and off. Very interesting.

[dimitrisblane]

Very nice and simple explanation. thank you

[Roger_Gadd]

My experience is that good Class D amps can have a lovely sound for less cost than a comparably performing class A or class AB amplifier. However, one option I considered for a speaker crossover I'm designing had an impedance up around 20 ohms at 20kHz. I discarded that option because I suspect the class D amp I want to use may not function well with such a high impedance at the top of the audio band. On the other hand, my mediocre class AB amplifiers would handle any impedance greater than about 2 ohms, regardless of the phase of that impedance.

[manusudha]

Seeing the sine wave output from class D amplifier, I would rather stick to class AB amplifier and lose some efficiency. 😊
Thank you for the best lecture .

[socksWithHolesInThem]

great summary, also thanks for the ringtone

[Mickparrysstepdad]

Some people complain of Class D sounding thin or sterile (Neurochrome and Hypex), but the Cheap, TPA3116 can sound great.

[janinapalmer]

We need another video showing what happened right at the end ..🤣😂🤣

[Bluelagoonstudios]

The greatest disadvantage is the sound, that is straight, and you have to like it, I have Class ABs and Class Ds and the ABs does sound more colored, more HIFI. I have also speakers that are straight, and you must like that sound, these are Phase Linear speakers. But if you hear my high-end B&W speakers, it's much more colored. But if you listen in my studio where I use Focal big monitors, that is totally different, also the price does.