900W H-class PA Amp with Limiter

[prasi]

This is the Completed Apex H900....Credit to Sir Mile....Very Powerful Amp Sir..

This is an amazing build, very compact and well arranged. Congratulations!

 

[moore4889]

OMG
22kg for 1800w its too bulky

i think its just neough for 1800w...coz i own also an amp that weights 22.3kg..Lem Procon 1800plus (900w/ch) just a class ab amp but with an amazing sound ...

 

[moore4889]

OMG
22kg for 1800w its too bulky

for me sir its just enough...ive own an amp that weights 22.5kg and has a rating of 900w/channel...Lem Procon 1800plus....just a class ab amp but with an amazig sound...

An externally hosted image should be here but it was not working when we last tested it.

 

[moore4889]

This is an amazing build, very compact and well arranged. Congratulations!

Thanks sir ..

 

[Parag99]

OK obviously
But why u don't tried h900 three tiered for less heat and so less weighted heatsink
And the term of heatsink size matters course we never buy airplane for distance of 5kilometers
Hahahah

 

[Parag99]

Had anybody got 60vac at output from h900 with dummy load at normal clip condition
Then pls pls pls post videos or pics.

 

[apexaudio]

Had anybody got 60vac at output from h900 with dummy load at normal clip condition
Then pls pls pls post videos or pics.

https://www.youtube.com/watch?v=yDeoWq8Cw7s

 

[yahya adi]

I used TL072 on some PCB, at the end this is PA amplifier, work with 18inch subwoofer.

Hi mr.mile

 

[prasi]

OK obviously
But why u don't tried h900 three tiered for less heat and so less weighted heatsink
And the term of heatsink size matters course we never buy airplane for distance of 5kilometers
Hahahah

do you need to carry your amplifier 5 km everyday? read some basics about amplifiers on ESP pages, that would be my advice... no need for a sarcastic guffaw!

 

[Parag99]

https://www.youtube.com/watch?v=yDeoWq8Cw7s

OK sir mile
Then why h900 clips at 38vac o/p with music signals

 

[44250]

OK sir mile
Then why h900 clips at 38vac o/p with music signals

the question should be "why MY h900 clips at 38Vac...",just because this amplifier was built in several hundred 💯 pieces and quite a few variations,and all of them work as it should. you have done something wrong,do not seek for a mistake in a successful design,but in unsuccessful built that you did.

 

[Parag99]

the question should be "why MY h900 clips at 38Vac...",just because this amplifier was built in several hundred 💯 pieces and quite a few variations,and all of them work as it should. you have done something wrong,do not seek for a mistake in a successful design,but in unsuccessful built that you did.

If u get 60vac then post video
Not with halogen lamp load but with 4ohms perfect load

 

[M109R]

If u get 60vac then post video
Not with halogen lamp load but with 4ohms perfect load

The resistance of the halogen lamp will rise quite dramatically when it heats up. Yes I know but this may not be obvious to all readers.

 

[boss2009]

Modified protect

It's ok, 1N4148 add to the circuit.

Hello Sir Mile... may I ask if this modified circuit works better than its previous version? I have use 50-0-50 vac 2060VA toroid for my amp and uses 1amp 15vac to power up my protect circuit. I have a plant to modify my existing protect based on your modification and tested by Mr. Thimios..


thanks and regards

 

[khalsa]

very nice work ..in pro amp

 

[boss2009]

very nice work ..in pro amp

Thanks Mr. Khalsa

 

[gothye1984]

Hello Sir Mile... may I ask if this modified circuit works better than its previous version? I have use 50-0-50 vac 2060VA toroid for my amp and uses 1amp 15vac to power up my protect circuit. I have a plant to modify my existing protect based on your modification and tested by Mr. Thimios..


thanks and regards

Can you share circuit H900 (TEF) ?

 

[boss2009]

Can you share circuit H900 (TEF) ?

Hello ... Please check out this post #2512 by Mr. Liem Poo..


Regards

 

[audiobrad]

Good day to all DIYers.

Nice build BOSS2009 !!!!!!! Just a suggestion to you if you want to keep the temperature done on heatsink you should turn the module on its side. Because heat rises . If you leave the module like that shown in the photo uploaded your transistors temp will stay high.

please note its only a suggestion !!!!!!!!!!!
Regards.
Audiobrad.

 

[AndrewT]

Much better to form tunnels from the fans to the blown heatsinks. The heatsinks need the air flow to cool theamplifier.