900W H-class PA Amp with Limiter

[apexaudio]

Originally Posted by electra_ina

Thanks alot Apex...Yes I undestood..If each trafo 10 Ampere, what 2 trafo will be 20 Ampere or 84vac x 20 A = 1680 watt??
Pozdrav..

No 2 trafo will be 10A, but 168vac and you have 1680watt.

[electra_ina]

Originally Posted by apexaudio

No 2 trafo will be 10A, but 168vac and you have 1680watt.

Hvala unapred...
One againt..thanks so much...I understood...
Next..I will try B500 plus step up driver TL072 to H900...
I'm sorry.. too much "stupit" questions...

Regards..

[apexaudio]

Originally Posted by electra_ina

Hvala unapred...
One againt..thanks so much...I understood...
Next..I will try B500 plus step up driver TL072 to H900...
I'm sorry.. too much "stupit" questions...

Regards..

Nema problema,
There is no stupit question

[andrewlebon]

hi apexaudio
greetings is it worthwile to put 4 more pairs will power increase
in 4 ohms for 1200 watt in 4 ohms what do we do
thanking you
andrew lebon

[apexaudio]

Originally Posted by andrewlebon

hi apexaudio
greetings is it worthwile to put 4 more pairs will power increase
in 4 ohms for 1200 watt in 4 ohms what do we do
thanking you
andrew lebon

I suggest to build complete amplifier, and use for a time. Adding 4 pairs will increase safty.

[khalsa]

Hi apex.
H900 watt project is very good. It really works very well and as well as output is very Punchy and clear.
I am confused in one thing, may be this is a problem that u might know.
I need the step driver test up procedure.

when we turn the amp on then the voltages on fuses are 55 +ve and -ve.
When we increase the volume voltage quickly goes upto 110 +ve and -ve on the fuses.
When we descrease the volume the voltage aren't goes down it remains the same on high voltages as 110 +ve and -ve on both sides. when we switch it off and turn it on again then voltages remain stable such as 55 +ve and -ve. but i think that the voltages should be vary with the volume controll. Plz help me.
I look forward to see ur reply

Thanks

Khalsa

[apexaudio]

Originally Posted by khalsa

Hi apex.
H900 watt project is very good. It really works very well and as well as output is very Punchy and clear.
I am confused in one thing, may be this is a problem that u might know.
I need the step driver test up procedure.

when we turn the amp on then the voltages on fuses are 55 +ve and -ve.
When we increase the volume voltage quickly goes upto 110 +ve and -ve on the fuses.
When we descrease the volume the voltage aren't goes down it remains the same on high voltages as 110 +ve and -ve on both sides. when we switch it off and turn it on again then voltages remain stable such as 55 +ve and -ve. but i think that the voltages should be vary with the volume controll. Plz help me.
I look forward to see ur reply

Thanks

Khalsa

Voltage on the fuses is 55V, and if you measure with DMM, voltage in DC range can't be over 70V with high volume level, becouse step on 110V is fast and short, and you never can measure 110V on fuse. Something is wrong on your amp, can you post some pictures, maybe I can see mistake.
Regards

[khalsa]

Hi apex I attach the photos
plz have a look.

[apexaudio]

Originally Posted by khalsa

Hi apex I attach the photos
plz have a look.

Component layout is ok, what is the fet useing in step driver? Try IRFZ44 for test. Where you connect input gnd from psu? Is output signal clear, without HF oscilation?
Regards

[khalsa]

Hi apex i am using ssh70n10a mosfet it contans 70 ampere 100volt.

Blue wire in input ground. i connect direct to the PCB.
Output is clear no problem.
plz chk this out.
Regards
Khalsa