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Old 27th January 2005, 02:29 PM   #1
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Default 1600watt!!! power amp


hi guys,

its been long but this time i'm here again with this.
I mean with this circuit i found from Matsoft free schemes
I wonder if this thing works, and if so
what might be its recommended components, becuase I think
its supply rails are just very high for the diff amps.


regards,

hienrich

(thanks to DX, AKSA, and every one who helped me with my last thread,
People, you helped me and every one in the thread a lot. )
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Old 27th January 2005, 02:51 PM   #2
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I think this member can help you about this schematic !
http://www.diyaudio.com/forums/membe...o&userid=33092
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Old 27th January 2005, 03:42 PM   #3
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It takes an 160 volt peak to deliver 1600 watts into 8.
I don't see that off a circuit with 75 volt rails. Is there
something else going on?
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Old 27th January 2005, 04:50 PM   #4
MikeB is offline MikeB  Germany
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Hi !

I am sorry to say this... This circuit is "horrible"...
A symetrical diffamp without any RE's at this supplylevel
is deadly thermal unstable. Also the vas is missing ANY RE.
It's very likely that this does not really work.
Also it has only 300watts into 8ohm. When connected to 8ohms
it's likely to blow. At 4ohms it will blow. You need at least 3 or 4
times the outputdevices on a BIG heatsink.
The diffampbjts with to92 will already be above 40°, the bias in
vas is only defined by temperature of devices.

If this is your first amp to build, try something smaller, like +/- 24v,
just for learning...

Mike
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Old 27th January 2005, 06:31 PM   #5
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I think this thread is about the same amp design.

Has any one built this 1KW amp?

He states that more output devices need to be added...

I take it the concensus here is that it is still not a good design?

Bean
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Old 27th January 2005, 08:21 PM   #6
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Default a bomb scheme....

maybe this is just a formula for a little bomb. So much is

lacking.


That's why I'm also in doubt if this really works.
Or may be there is a typographical error on the supply rails.

I'll try to read the other thread.



regards,

hienrich
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Old 28th January 2005, 09:49 AM   #7
djk is offline djk
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You want something that works?

Got a TIFF viewer? Go to:

http://patft.uspto.gov/netacgi/nph-P...S=PN/5,387,876

and click on 'images'.

That output stage with ±95V will drive 1KW into 2R, two bridged on ±80V or so will drive 1600W into 4R.

Use the Leach front end.

Outputs = MJ21193/94

Drivers = MJL1302/3281

Use two 30-0-30 1KVA (or bigger) in series to get the correct voltages.
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Old 28th January 2005, 10:12 AM   #8
MikeB is offline MikeB  Germany
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Quote:
Originally posted by BeanAnimal
I think this thread is about the same amp design.

Has any one built this 1KW amp?

He states that more output devices need to be added...

I take it the concensus here is that it is still not a good design?

Bean
This is not a bad design, but at supplylevels of +/-95volts i would
recommend something more reliable.
The design posted there is very sensitive to supplyfluctuations,
a few volts more can heat it up, and few volts less result into ClassB.
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Old 28th January 2005, 11:09 AM   #9
uli is offline uli  Austria
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Quote:
Originally posted by Nelson Pass
It takes an 160 volt peak to deliver 1600 watts into 8.
I don't see that off a circuit with 75 volt rails. Is there
something else going on?
Guess, its into 2 Ohms.

But that wont work either

Uli

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Old 28th January 2005, 11:25 AM   #10
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hmmmmmm........

Yah,


I think the Leach in the DIFF and the VAS. I guess this is appropriate, but with out the protection circuits.

I'll try to work on this

actually becuase I've got numbers of MJL21194's.
the amp interests me alot....

hienrich
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