CA9 Schematic needed

[andrewlebon]

Hello
greetings can anyone help me with CA9 SCHEMATIC chinese amp AB CLASS
warm regards
andrew lebon

 

[angeltech]

Sir:

http://www.crestaudio.com/media/schematics/ca_schematic_set1.pdf

please check hope this help.

Regards,

Angeltech

 

[andrewlebon]

Hi Angeltech
greetings the CA9 schematic i am looking for is the chinese version of crest audio not orignal CREST AMP its ab class 1200 watt in 2 ohms thanks for your kind help
warm regards
andrew lebon

 

[andrewlebon]

some pics of CA9

SUPPLY IS 120 VOLTS DC+/-

 

[angeltech]

Is this the Circuit of CA9 china? looks it is single sided board and can be cloned easily hehehe

Regards

 

[Walkalone]

1200W class AB @2 Ohms in with the rail is +/-120V?
It's impossible with 2SC5200/2SA1943. They have Vce is only 230V, and very small SOA.

 

[andrewlebon]

CA9

TRYING to clone it will use MJL4281 and its complement
warm regards
andrew lebon

 

[ravpreet420]

nice work.....

 

[Walkalone]

I think can get lower the rail and use MJL21193/MJL21194 to larger SOA, safety if you run they at 2R load.
ON Semi MJL21193/MJL21194 have 1.8A@100V@1sec.
100VDC can get 500W per 8 Ohms load (about 63VAC @ 8R, 8A => need 5 pairs to load 8 R and double to 4R.)

 

[angeltech]

Great you need not schematic I think, you already made it into reality nice job...

keep us updated...
regards,

Angeltech

 

[angeltech]

Hello andrewlebon,

What's your opinion, comparing it to Vertex, seems you have made it too, the previous years.

Regards,

Angeltech

 

[Walkalone]

I think their schematics like Crest CA9, 12, 18 but cut off class G cascode stage.
Fully complementary input, darlington Vas and triple EF3 output.
Some pro-amp in my country like this, they used +/-95VDC rail. But output devices are 2SC5200/2SA1943 (ON semi devices not sell in my country, if you want use it, shipping from Digikey or Mouser, and prices are expensive.)

 

[angeltech]

Hello Walkalone,

Do you have schematics of this amps? the original Crest is quiet complicated. to much for DIY....

Regards,

Angeltech

 

[Walkalone]

Hello Walkalone,

Do you have schematics of this amps? the original Crest is quiet complicated. to much for DIY....

Regards,

Angeltech

I don't have detail schematic of Crest CA class AB. But like i said, they're simply original Crest class G and cut off cascode stage in output stage.
Crest CA9, CA12, CA18... all they're class G.
We know, class G is a cascode stage, upper in class B output stage.

 

[angeltech]

Hello andrewlebon,

You can trace the original board for a schematics, anyway hows the opeartion of it?

Regards,

Angeltech

 

[Jonsen]

ca 9

TRYING to clone it will use MJL4281 and its complement
warm regards
andrew lebon

plz can u give the diagram of ca 9 china amp.

 

[black]

nyce work

 

[andrewlebon]

You can trace the original board for a schematics, anyway hows the opeartion of it?
Hello Angeltech
greetings yes traced orignal boards sound is very clear and powerful
has vi limiter and all protections once amp is working new compact pcb will be designed
stay tuned little busy with some amps
warm regards
andrew lebon

 

[angeltech]

Sounds interesting....

Regards,

Angeltech

 

[andrewlebon]

Hi Sameerx1
greetings need you to design pcb for led display clip temp signal CLONED pcb
is workng GR--- if time permits we could do a full test on sunday
warm regards
andrew lebon