900W H-class PA Amp with Limiter

[QQ12e5k1]

step driver

is this correct sir?

 

[irvynejay]

r17 r20,r18 r21 should be connected to hi rails

 

[QQ12e5k1]

Corrected

Like this????

Regards

 

[irvynejay]

yes

 

[mkubawat]

hi soerdjanto
please post layout of HX900 with protector
thanks

mkubawat@yahoo.com

 

[A square]

we need help...

Who has the waveform, I want to compare. YouTube - ‪Apex amplifier‬‏

hello diyers can any one hep us....???

thank u very much......

 

[eesbiboi]

try the correct schematic on post 1346

hi,

did you manage to make the transistorized step driver work???...

regards,
ees

 

[saw audio]

Very Good project

 

[mkubawat]

anyone have layout of HX900 with protector

 

[abypaulose]

Circuit Diagram of NAD3155

Hai,
I am trying to fix an NAD 3155 stereo amplifier. I would greatly appreciate if someone can send me schematic of this amplifier.

Regards,
Aby

 

[mkubawat]

hi
here is NAD 3155 schematic

 

[Gitsa]

Dear Apex Audio, how do I fix this problem?
YouTube - ‪Apex amplifier‬‏

 

[princenk007]

Hello mile,

Sir, I want to know if your amp(900w) will be any good match to drive the PA horn driver units. I will be driving at least 10-12 of these horns@ 70% volume. Below are the details:
Ahuja Sound Solutions
I will not be using any loudspeakers in the same amp output.
Thank you...

 

[sopin]

Please give me pcb layout for apex step driver.. thanks before..

 

[andrewlebon]

chinese amp stepdrive

hi
greetings most chinese amps have this stepdrive
1 2 or 3 pairs 2sc5200 2sa 1943
2 pair of MUR3060
3 pair of mje340 350
4 2sc5198 2sa1941
step drive trrigered from speaker output
thanking you
andrew lebon

 

[romulo_rosil]

Hi! andrewlebon,

Do we have a schematic of your chinese amp step driver and can you post?

Thank you, amigo.

 

[andrewlebon]

hi
greetings there is no schematic as i directly copied it from the Chinese amp PCB as shown..... step works well will post schematic as i am tracing the circuit now....

thanking you
Andrew Lebon

 

[ravpreet420]

Andrewlebon sir
pls send pcb layout and componant value

 

[romulo_rosil]

Hello! andrewlebon,

Thanks, my be i will try to use for H900. IR2117 it's so hard to find.
My H900 was already done, but class AB for the moment.
I don't know who was successful for TL072 step driver and i used my TL071, but din't work.

amigo
romulo

 

[irvynejay]

H900 With Apex Sub Using Active Xover

Fourth channel H900 Superb Bass Thanx Mile's