900W H-class PA Amp with Limiter

[stewin]

hi all before i complete the apex lm311 version , let me make the below apex 900 using tl071
below are photos of projects made and discussions

the discussion is at page 500wts forum and 900wts forum #659 , #975 , #1,055 #2527 , #2584 , #

https://www.diyaudio.com/community/threads/500w-pa-amplifier-with-limiter.164208/post-2316370
https://www.diyaudio.com/community/threads/900w-h-class-pa-amp-with-limiter.162408/post-2374243
https://www.diyaudio.com/community/threads/900w-h-class-pa-amp-with-limiter.162408/post-3482304
https://www.diyaudio.com/community/threads/900w-h-class-pa-amp-with-limiter.162408/post-3599298

 

[stewin]

hi @vars

the files are on post number #3903


please is for diy build and enjoy I sometimes tweak the files and this is the last thing I did to it and is here

hi @vargasmongo3435 have you done apextd1800 pcb kindly share files

 

[trongky193]

please help, my broad h900 follow the original schematic. The circuit works normally, but when the volume is reduced to min, use a metal bar to touch the mass of the speaker signal, there is still a rustling sound and sometimes even radio waves are received.

 

[stewin]

before i finish the three tier lm311 version , let me try out the tl071 version


https://www.diyaudio.com/community/threads/900w-h-class-pa-amp-with-limiter.162408/post-6909546

 

[Sunny22g]

My TD 1800

hello sir can u plz shear which layout you use .and pdf plz shear

 

[Mas ArulTV]

hi apex, i'm drawing h900.

 

[Agus sugiono]

IR2117 memberikan sirkuit dengan stabilitas terbaik untuk mengemudi MOSFET. Digunakan dalam amplifier konser industri.

IR2117 give circuits with best possible stability for driving mosfets. Uses in industry concert amplifiers.

why does the input zener diode use 18v and 30v?

 

[stewin]

why does the input zener diode use 18v and 30v?

hi agus
those zeener diodes are for the switching class d stage

 

[stewin]

hi all , i am working on this class td based on kartino and files from here ,. will it work?

 

[printnik]

Stewin, I think you have a mistake.​

 

[stewin]

Stewin, I think you have a mistake.​

oh yes , thanks printnik for pointing it out , i have rectified it .

 

[RDS87]

before i finish the three tier lm311 version , let me try out the tl071 version


https://www.diyaudio.com/community/threads/900w-h-class-pa-amp-with-limiter.162408/post-6909546

Any progress on your work?
Is it working properly?

Regards

 

[akosboros]

Why is C35 / C37 connected to L5-1 and not to L5-2 (respectively C34 / C36 to L4-2 and not to L4-1)?

 

[stewin]

Why is C35 / C37 connected to L5-1 and not to L5-2 (respectively C34 / C36 to L4-2 and not to L4-1)?

because it's a class ee engine configuration

 

[akosboros]

Like this one?

or like this one?

or like this one?

 

[stewin]

Like this one?
View attachment 1084555



or like this one?
View attachment 1084554



or like this one?


View attachment 1084556

Why is C35 / C37 connected to L5-1 and not to L5-2 (respectively C34 / C36 to L4-2 and not to L4-1)?

it is kartinos design, i don't understand why myself. but below is the link to a working prototype at youtube .

you can use youtube translate , to translate the captions to english

 

[akosboros]

It's actually my mistake. I confused C34 with C32. The amplifier in the video looks good. But it showed tests only at 100 Hz. What do you think of the following oscillograms, which were made with my recently built amp? It is powered at +-95V.

 

[stewin]

which class , kindly post schematic and build photos

It's actually my mistake. I confused C34 with C32. The amplifier in the video looks good. But it showed tests only at 100 Hz. What do you think of the following oscillograms, which were made with my recently built amp? It is powered at +-95V.

View attachment 1084814

which class ? kindly post schematics and build photos .

 

[akosboros]

My amp is eengine. The oscillograms above are on the 4 ohm load.
The amp isn't finished yet, it's a work in progress.

 

[stewin]

My amp is eengine. The oscillograms above are on the 4 ohm load.
The amp isn't finished yet, it's a work in progress.

oh this is a great project ,nice job .
why did you opt for fets instead of bjts?
also what is the max rail voltage you have designed it for?
and finally what is the lowest impedance it can handle?