1000W Simple PA Amplifier

[wiljj78]

Wow.. very expensive MJL****

I Just imagine how the output stage layout of this monster amp will looks like.....if using MJL that's quite heavy....

 

[apexaudio]

I Just imagine how the output stage layout of this monster amp will looks like.....if using MJL that's quite heavy....

This amp use 3U case with two 120x120mm fans in parallel position, PCB is much larger than this

 

[apexaudio]

Simple display circuit was add.

 

[apexaudio]

BA1200

Litle upgrade

 

[apexaudio]

BA100

Low power version for fun.

 

[sajti]

I think, that MJL21193/94 is suitable too. Or even the lower priced NJW21193/94, with powerful cooling.

Sajti

 

[tiefbassuebertr]

This Amplifier is simple class AB design for PA

The driver stage Q9+10 from the darlington power follower consist of the same type of power BjT's than the output stage. Crest Audio uses also this solution for insuring enough current for the output stage in parallel mode.
For me is the question, whether the predriver stage (VAS-Stage) is able to provide enough current to feed Q9+10, and whether the value of 47R for R15 is the ideal choice.

 

[apexaudio]

I think, that MJL21193/94 is suitable too. Or even the lower priced NJW21193/94, with powerful cooling.

Sajti

Also TO3 transistors like MJ15024/25... can be use.

 

[apexaudio]

The driver stage Q9+10 from the darlington power follower consist of the same type of power BjT's than the output stage. Crest Audio uses also this solution for insuring enough current for the output stage in parallel mode.
For me is the question, whether the predriver stage (VAS-Stage) is able to provide enough current to feed Q9+10, and whether the value of 47R for R15 is the ideal choice.

VAS work with 25mA, I want simple circuit without predrivers (TEF).

 

[sajti]

Also TO3 transistors like MJ15024/25... can be use.

Of course, but they are large, and the mounting is complicated, unfortunately.

Sajti

 

[apexaudio]

Of course, but they are large, and the mounting is complicated, unfortunately.

Sajti

I want large amplifier, It can be small if work in class D
Regards

 

[sajti]

I want large amplifier, It can be small if work in class D
Regards

That's OK. Only the mechanical work is complicated, and the TO3 parts cost double than the TO3P devices.
I think, that is possible to build this amp in 2U box


Sajti

 

[apexaudio]

That's OK. Only the mechanical work is complicated, and the TO3 parts cost double than the TO3P devices.
I think, that is possible to build this amp in 2U box


Sajti

It's possible to build this amp in 2U box, but I want to build it in 4U box

 

[sajti]

It's possible to build this amp in 2U box, but I want to build it in 4U box

Maybe I will try a 2U version...

Sajti

 

[apexaudio]

Maybe I will try a 2U version...

Sajti

You can't find fans strong enough for cooling in 2U, only you can use large fan in horisontal position like in CROWN Macrotech amplifiers.

 

[joker26]

i hope you share layout pcb this amp, i`am very very hope can try it

 

[sajti]

You can't find fans strong enough for cooling in 2U, only you can use large fan in horisontal position like in CROWN Macrotech amplifiers.

2fans/side can be enough. Well perforated front, and back panel for the box helps too.

Sajti

 

[apexaudio]

2fans/side can be enough. Well perforated front, and back panel for the box helps too.

Sajti

That's ok but you need lot of space for large PSU, 2kW for stereo is minimum.

 

[apexaudio]

+/-18V from +/-110V

 

[mbah dukun]

wowwwwww