My 1024W RMS CLASS A+ amplifier.

[Hartono]

how about the power transformer ? must be 15 Kg ++ ???

[GK]

Originally posted by Hartono
how about the power transformer ? must be 15 Kg ++ ???

All up it will be a lot more than that. I've ordered four 200VA EI (split bobbin - better primary-secondary isolation than a toroid) transformers to provide the floating supplies for the class-A stages. These weigh 2.8kg each.

A pair of 2kV toroidal transformers supply the class B stages. I don’t know what these will weigh.
There are also various little transformers for ancillary stuff.
Incidentally, whilst finalising the transformer order and looking into available electrolytic capacitors, I have revised the amplifiers rated power/load impedance again

The amplifier is now going to be built to deliver 1000W rms per channel (continuous sinewave) into 2 ohms, not 4 ohms. This is much more sensible, as a pair of 4 ohms speakers (or even a quad of 8 ohm speakers) can be paralleled to make a 2 ohm load. Ever seen a 4 ohm 1kW speaker in a HiFi shop ) ??

The 2 ohm rating also means that the class-B supply voltages can be kept well below +/-100V (1kW rms into 2ohms = 63.2V peak). Electrolytic filter capacitors for supply voltages below 100V are much cheaper and easier to obtain.

Phew. I’ll get back to the (final? ) version schematics and PCB layouts now.

Cheers,
Glen

[Hartono]

If you build it, probably you will be on world's class A hall of fame. 1000 watt class A

[GK]

Originally posted by Hartono
If you build it, probably you will be on world's class A hall of fame. 1000 watt class A

If????

Dude, I'm not going to make a BBQ out of those ridicuously expensive heatsinks! . The transormers are on the way, I've already got the one hundered 10,000uF 16V ELNA electrolytics for the filtering of the floating class-A power supplies..........

Stay tuned to this thread.......

Cheers,
Glen

[myhrrhleine]

2000Watts?
What kind of speakers are you melting?

[JRKO]

What will this thing be pulling out of the wall?

Your carbon footprint will be soooooo big and deep kids will be able to use it as a skatepark

[Craig405]

Wow, what an undertaking!
will be very impressive when finished, a feat of engineering and DIY!

Might look more like an old 70's super computer in the corner of the room instead of an amp though, except probably much hotter!

Hope you saved up some reserve cash to pay your power bills though, maybe you could use it for a kind of co-generation system during winter months .


Regards
Craig

[myhrrhleine]

Originally posted by JRKO
What will this thing be pulling out of the wall?

Might want to consider mains circuit breaker derating too.
20A@120V should (barely) power 2 channels.

If it were me, I'd run a new 240V circuit, with a minimum 10ga. wires.
Such an amp deserves a good power supply.

[Juergen Knoop]

it deserves 3-phase current!

[myhrrhleine]

Personally, I wouldn't want 3 phase as it would increase the hum frequency and make it more noticable.