900W H-class PA Amp with Limiter

[wattaniya]

^just ask your costumer to stick to 8 ohm speakers.....

hi tony,
the customer have 150w speaker/8ohm, so he need, to put two speakers per one side and a tweeter.

 

[TonyTecson]

depends on how loud he plays his music, the situation is not that dim, only that the amp may never clip before the mechanical limits of the speakers are exceeded....

lowering the rails by 40% halves the power, a rough guide if you want a lower rating for the amps....

 

[clovi_kate]

hi guys..

i'm planning to build an h900 base on apex. but the only thing is my transformer reaches +-75v and +-150v. i'm using toroidal transformer and since it is permanently made, i don't have a chance to reduce my rails. Is there any revision on vas and biasing on h900?..
happy holiday everyone!!!

 

[opor]

Hi Apex,
For step driver by TL072 , is it possible for power rail 85-55-0-55-85 VDC?. Do I have to change the parts?

 

[apexaudio]

hi guys..

i'm planning to build an h900 base on apex. but the only thing is my transformer reaches +-75v and +-150v. i'm using toroidal transformer and since it is permanently made, i don't have a chance to reduce my rails. Is there any revision on vas and biasing on h900?..
happy holiday everyone!!!

+/-75V and +/-150V is to high for H900 go to vertex.
Regards

 

[apexaudio]

Hi Apex,
For step driver by TL072 , is it possible for power rail 85-55-0-55-85 VDC?. Do I have to change the parts?

Yes, and no need to change any parts.

 

[electra_ina]

+/-75V and +/-150V is to high for H900 go to vertex.
Regards

Mr. Mile...with +/-77vdc and +/-154vdc..can be use on H900 modified triple emitter follower (TEF) with 10 TR final?? I used IRF2807 instead Irf540.
Regards
Electra_ina

 

[apexaudio]

Mr. Mile...with +/-77vdc and +/-154vdc..can be use on H900 modified triple emitter follower (TEF) with 10 TR final?? I used IRF2807 instead Irf540.
Regards
Electra_ina

IRF2807 is 70V, you must find some 100V fet like IRF540 but with higer current.
Regards

 

[ravpreet420]

hello mr.mile
can i used IRF3710 instead Irf540 and +/-77 and +/-154 .....can be use on H900 modified with triple emitter follower (TEF) with 10 TR final?
is it possible ? if possible what is wattage of h900 at 4 ohm?

 

[mkubawat]

Hi Apex
can i use UF4007 instead of BAV21 & what is proper transformer rating(VA) for two board of H900

 

[apexaudio]

hello mr.mile
can i used IRF3710 instead Irf540 and +/-77 and +/-154 .....can be use on H900 modified with triple emitter follower (TEF) with 10 TR final?
is it possible ? if possible what is wattage of h900 at 4 ohm?

IRF3710 will be OK, and you can get 1500W at 4 ohm.

 

[engel dela pena]

electra ina,
please share the lay out you use in your 10 pair tripple ef

 

[electra_ina]

@Mr. Mile..thanks a lot.

@ Hee..Engel...I just modified original H900 layout to H900TEF, no made new layout H900tef, I don't have skill to make layout H900tef. Only cut and jumper layout PCB H900...
Sorry, bad english
Regards

 

[engel dela pena]

ok
just share your work
before you etch a design there must be a pattern
just share it to every one

 

[agungcahyono]

Mile, Could I used IRF740 instead IRF540. thx B4

 

[electra_ina]

Hi..Engel..no..no...new pattern..H900tef used original layout H900. Like this:

 

[aman khalsa]

hmmm very good job sir.....what is the trfo rating...????

 

[electra_ina]

Thanks Aman...trafo 3kva CT 55-110vac, diameter 20cm, weight 15kg..

 

[engel dela pena]

can somebody share tripple ef lay out
hopefully 7 pairs or up
hopefully like SOERDJANTO pcb,''BUT FOR SHARE,NOT FOR SALE''
IRVYNJAY lay out of step can be use for lay out like soerdjanto and chestap style of output layout and also vertex lay out,i see this output lay out advantage of consuming space to prevent long heat sink,

 

[engel dela pena]

this one is a nice try,
from b500 3 ef
i just wonder ,shared incompletely,,,