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Old 1st August 2007, 04:54 AM   #1
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Default 2500 watt class AB

I presume that this circuit is actually working

contrary to Rod's design that its only simulated and not

actually put to life



I do not know if this circuit does suffer or does suffer

from instabilities which is very important, specially

with the specified power supply.

what are you views on this...

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Old 1st August 2007, 06:50 AM   #2
Nordic is offline Nordic  South Africa
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I think because of the lack of isolation transformers, this project falls in the category of stuff we are not allowed to discuss here...
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Old 1st August 2007, 06:56 AM   #3
jaycee is offline jaycee  United Kingdom
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I agree, it is *CRAZY* dangerous... i'm not even convinced it'd actually work.
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Old 1st August 2007, 07:04 AM   #4
AJT is offline AJT  Philippines
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not worth anybody's time....
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Old 1st August 2007, 07:09 AM   #5
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its power feels very convincing

but of course very dangerous

since there are no good isolation..........

ok here

let us assume that we have a good and perfect power

supply unit with robust amount of filtering ( caps ) and

and still with plus/minus 130V on its rails, will this thing

still works? or are we still facing instabilities,

since there are no lag compensation

capacitors
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Old 1st August 2007, 07:18 AM   #6
jaycee is offline jaycee  United Kingdom
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wouldnt the Vceo of the recommended outputs be exceeded? I certainly think the SOA would be...

not to mention, how the hell would you cool the output stage?

nope. no way is this going to work.. and for such output power you certainly wouldnt want Class AB anyway. Class D would make a hell of a lot more sense.

not to mention... if anyone touches speaker terminals while grounded - zap, dead!
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Old 1st August 2007, 07:25 AM   #7
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plus minus 130Vdc

so does this mean 2 to 3 tier class H in substitute....?

Class D?
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Old 1st August 2007, 08:04 AM   #8
quasi is offline quasi  Australia
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So is this a double insulated build or ....

Anyway, probably many questions to consider but here's just one;

1. What potential is the non-isolated ground at? and what would happen if chassis to chassis contact were made with something else? Then what would happen if one of the 30 amp fuses blew?

I that two questions?

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Old 1st August 2007, 11:46 PM   #9
dangus is offline dangus  Canada
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It's safer than that switching amp that a US electronics magazine published which ran directly off the line (no isolation transformers at all).

As for this amp... I don't see any feedback from the emitter resistors to provide current limiting or SOA protection. And there's no protection circuits to disconnect the speaker or crowbar the power supply in case of a DC fault. Any speaker that will handle 5000 watts is worth protecting, even if it's rented.

It doesn't make me regret buying a Yorkville Audiopro AP4040 which does 2400 watts RMS bridged into 8 ohms.
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Old 1st August 2007, 11:55 PM   #10
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Quote:
Originally posted by hienrich
its power feels very convincing

but of course very dangerous

since there are no good isolation..........

ok here

let us assume that we have a good and perfect power

supply unit with robust amount of filtering ( caps ) and

and still with plus/minus 130V on its rails, will this thing

still works? or are we still facing instabilities,

since there are no lag compensation

capacitors

It is irresponible to guess if the amp is going to be stable or not just from schematic, but feedback definitely is not very high, so maybe...
I'd leave it for other reasons above.
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