Optoisolated gate drive Class D Amplifier

[Experimentonomen]

Thread reopened after discovering changing to pre filter feedback instead of post filter feedback solved the issues i was having.

A schematic:
https://i.imgur.com/2fMUJih.png

Few pics:
https://i.imgur.com/f65Jac5.jpg
https://i.imgur.com/x1gJ0NO.jpg
https://i.imgur.com/QBCHIq9.jpg
https://i.imgur.com/Vc2HGOa.jpg

And a video:

 

[cowboybob]

Welcome, Experimentonomen!

So, can you heat your lab with that puppy??

You're a kindred spirit of mine, what with your build techniques and general bench mayhem...

And I must know the source of your music (especially for the woofer cookin')...

 

[Experimentonomen]

Cokkin/bakin a woofer with around 123 watts rms:

 

[audioguru]

I have heard plenty of good sub-woofers but I have never heard one without an enclosure before. Yours sounds awful.

 

[Experimentonomen]

Well this was never intended as a sound quality demo, just as a woofer cooker ****** video

 

[audioguru]

It is interesting that you are using opto-couplers instead of a gate driver IC and they work. Please post more details about your circuit.
What is the PWM frequency? What is the RMS output power? Do the Mosfets get hot?

 

[Experimentonomen]

I've already built a class d using a IR2010/2110 gate driver so i wanned to try something new.

The mosfets run stone cold, no heating, maybe ever so slightly on full power.

 

[audioguru]

I hope that you can test and post its distortion when you are finished.

 

[ronsimpson]

TI.com has some good information on class D audio (PWM audio).
I am glad to see you working on it. My first try was too many years ago. Then again I played with it on vertical amplifiers in BIG tv sets.
Coilcraft.com has some filter coils for the output stage.

 

[Experimentonomen]

above

 

[audioguru]

It looks good.
I have never tried "Manhattan" wiring like that yet.

 

[cowboybob]

Looking good!

How are you removing the cladding?

 

[Experimentonomen]

I use a utility knife and a dremel tool.

 

[ronsimpson]

very pretty.

 

[Experimentonomen]

See first post for an update.

 

[ChrisP58]

Don't give up. There are a lot of people on this board that can help. Let us know what the issues are, and we'll see what we can do for you.

 

[JimB]

A pity to delete it all, it is often good to know what does not work.

JimB

 

[4pyros]

Ya you just wasted everyone's time.

 

[Willen]

About scrap the project: Some time same happens to me. Some projects irritate me LOT and LOT so I scrap them and kick them like a base ball! Interesting thing is I bring them back by searching hardly.

 

[Ian Rogers]

Thread reopened....

Experimentonomen Can you update your entries.... and the title..