900W H-class PA Amp with Limiter

[audiobrad]

Thats right ANDREWT .Which is even a better way of keeping down the temp.

Regards
Audiobrad

 

[thimios]

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


Regards

This required a password,do you know the password?

 

[boss2009]

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.

Thank you very much for your suggestion Audiobrad...

Best Regards

 

[boss2009]

This required a password,do you know the password?

Hello Thimios... Please check post #2581

Regards

 

[thimios]

Hello Thimios... Please check post #2581

Regards

Thanks!

 

[andrewlebon]

H900

H900 in commercial amplifier whose pcbs burnt beyond repairs😉

 

[apexaudio]

H900 in commercial amplifier whose pcbs burnt beyond repairs😉

Nice

 

[andrewlebon]

Hello apexaudio
greetings can H900 be upgraded 7 pairs in out put section MV 70DC +/-
HV 140DC it would be nice a sucessor to h900
warm regards
Andrew

 

[LIEM POO]

Good Luck For You...........

Thank you very much for your suggestion Audiobrad...

Best Regards

Hello Thimios... Please check post #2581

Regards

 

[audiobrad]

Good Luck For You...........

His Liem Poo.
What is the highest voltages you used on the H900tef from Dan C.

Sent from my E2105 using Tapatalk

 

[audiobrad]

Good day Mr. Andrewlebon.

What is the highest voltages that i can use on the h900tef from Dan C ? 160,80,0,-80,160 vdc ? Or is it standard 120,60,0,-60,-120 vdc?

 

[pallab]

Increase rail voltage to 120v-60v-0-60v-120v, and you have 650w at 8 ohms, but 4 ohms will be minimum speaker impedance. With 110v-55v-0-55v-110v rail voltage you can run 3x8ohms (2,7ohms) speakers in parallel per channel.
Regards

sir,
I have 2 Identical transformer rated 40 0 40 1000va .How can manage psu for apex h900 by using this 2 transformer..??

 

[apexaudio]

sir,
I have 2 Identical transformer rated 40 0 40 1000va .How can manage psu for apex h900 by using this 2 transformer..??

Yes you can,
Regards

 

[AndrewT]

when connected in series you will end up with 80 40 0 40 80Vac
Does the PSU for the h900 use a centre tapped supply or does it need separated secondaries?

 

[Phong93]

The diyaudio Offers You
I need a full diagram of the Apex H900Fet I like and want to assemble it you can share this circuit helps me not to thank

 

[audiobrad]

Good evening.

I would like to wish all the members of diyaudio a blessed CHRISTMAS and a happy new year. I hope too hear from everyone in the new year! And THANK YOU to all the contributes which makes site super great! I can't wait to learn more.

 

[sownel]

Greetings mr.apex sir
Pls share Hx900 or ax500
Thank you sir.

 

[stewin]

Corrected from post 246. Anyone doing class H should be able to figure it out, but...

Hi all
I introduce you another version of a switching Rail H class from 900W H class amplifier.................I found this diagram on a Russian forum, VEGALAB , I hope you enjoy !
This schematic does not use expensive , obsolete or rare components, and will not pose problems when designing PCB

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

A 2-step class-H produces 30% less heat than same rating class-ab and a 3-step class-H produces 45% less heat.🙂

It also helps in handling reactive loading of output stage, since the VCE across transistor reduces very much in Class-H, Hence less heat and much safer operation.

hi mr Apex please advice i wanted to make class h 3steps because of the above reasons wanted to use es1d , lm 311, irfz44 , (4pairs) c3856 , a1492 , mur860 , voltage to be used dc +135 , +90 , +45 0 -45 , -90 , -135 dc

please advice . i am even willing to use complimentary step up fets eg p channel irf5210 and n channel irf 3710 . like the below pictures

i hope to achieve to drive low impedance like 2ohms less heat and to use widely available parts like es1d , lm311 irfz44 /irf1010 , c3856 , a1492 , mur860


thanking you all in advance steve

 

[sandeep kayarkar]

Hello sir mile.
Is this heatsink suitable for 2 H900 in bridge mode
Waight is about 1.3kg 12"x5.5"
And I'm using wire wound .33r is it okay or need to change?

 

[AndrewT]

How much heat will you be putting into the heatsink?
What is the Rth s-a of the heatsink?
What is the orientation of the heatsink?
Now use that information to find out the temperature of the heatsink and from there the De-rating Factor to apply to your output devices.