900W H-class PA Amp with Limiter

[ChingTan]

Hi apex sir,
pls can u check this power supply pcb board is correct for h900. i draw from the scematic.
because of the capacitor size, i bought capacitors and not fit to Ur psu baord, so thats why i design this pcb.there are series in caps. 2 into 10000 in series reduced to 5000uf or can u explain.

obviously correct

 

[wattaniya]

obviously correct

thanks for reply mrching.
but 2 10000uf caps in series reduced to 5000uf, is it correct?

 

[apexaudio]

thanks for reply mrching.
but 2 10000uf caps in series reduced to 5000uf, is it correct?

Yes, but maximum voltage increas to 126V

 

[wattaniya]

Yes, but maximum voltage increas to 126V

thanks for reply sir.
so in this situation is this power supply enough to run two channels of h900.?

 

[pawan borkute]

dearsir
i want step draver pcb layout this amp

 

[mkubawat]

Do you have two channels (boards)? Post better pictures and some measurements.

Dear Apex, thanks for reply
yes i have two channels but i test one by one with one 750va transformer , voltage at DC side 110-56-0-56-110 , clipping found when voltage try to step to high rail(voltage measure at both fuses +/- 58v to 65 when clipping)
I use uf4007 instead of BAV21 & MUR1560 in circuit.
sorry for poor english

 

[wattaniya]

hi apex sir,
is it possible to get 1400w into 2ohm in h900, any changes in h900 pcb?

 

[apexaudio]

Dear Apex, thanks for reply
yes i have two channels but i test one by one with one 750va transformer , voltage at DC side 110-56-0-56-110 , clipping found when voltage try to step to high rail(voltage measure at both fuses +/- 58v to 65 when clipping)
I use uf4007 instead of BAV21 & MUR1560 in circuit.
sorry for poor english

Test second channel, and compare if there is differences...

 

[apexaudio]

hi apex sir,
is it possible to get 1400w into 2ohm in h900, any changes in h900 pcb?

I can't suggest to use H900 with 2R load, but many brand class H amps with 4 pairs of outputs suggest 2R load (crown, QSC...).
I suggest H900 with 7 pairs of outputs for 2R load.

 

[wattaniya]

ok i edit the h900 v2 for 7pair.

 

[khalsa]

sir apex and sir nazirdigi have tried it already good result

 

[wattaniya]

HI APEX SIR,
i edited with 7 pair. only right side finished.
pls check for errors.
i put two 4.7k/5w resistors in parralel to reduce the heat.

is it ok to drive 7 pairs with this drivers.

there is error transistor place c5200 instead a1943.

 

[apexaudio]

HI APEX SIR,
i edited with 7 pair. only right side finished.
pls check for errors.
i put two 4.7k/5w resistors in parralel to reduce the heat.

is it ok to drive 7 pairs with this drivers.

there is error transistor place c5200 instead a1943.

For 7 pairs of outputs you must use predrivers in triple emiter folover topology.

 

[mkubawat]

Test second channel, and compare if there is differences...

same problem in both channel

 

[wattaniya]

hi apx sir,
pls can u check this tef is correct on this image.

 

[wattaniya]

HI APEX SIR,
pls check 1755 post.

 

[apexaudio]

hi apx sir,
pls can u check this tef is correct on this image.

It's correct.

 

[wattaniya]

It's correct.

thanks sir,
so now i can add another three pair of ouput for triple darlington.

 

[wattaniya]

hi apex sir,
one of my customer asked for 300w and 500w into 4ohm load amp,so if i reduced the power voltages. i think its ok. so for 300 and 500w what is the dc voltage to provide for this h900?

 

[TonyTecson]

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