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Old 4th August 2002, 05:09 AM   #1
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Default seperate chassis for power supply

i am thinking about building my first amp soon, i havent thought much about it yet though.

I want to make an intergrated amp, but with a seperate power supply and having each channel be its own mononblock. Sort of like the Mark Levinson No32 with the "dirty box" and "clean box" Would this have any siginifigant sonic advantages, I know the seperate chassis would add a lot to the costs of it, would that money be more wisely spent purchasing better parts?

Any designs out there to recommend? i am wanting around 200 watts class A. I was looking modifying the aleph 2's to increase there power output. How would i do this? high voltage? more transisters?

Also any help on control circuts would be greatly appreciated. I dont want a fancy display or anything, just basic input switching and volume control.

thanks alot,
ben
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Old 4th August 2002, 05:15 AM   #2
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So long as you put the power supply filter caps in each monoblock, it should be fine. I'm doing the same thing in my system. That is, 5 monoblock ESP 3A amps on a 2kW tranny. Although, now I'm looking at a switching design with HV outputs to directly drive ESLs.

Will
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Old 4th August 2002, 05:24 AM   #3
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thanks for the reply will,

Why do you say the filter caps have to be on the monoblock itself, have you learned this from experience?
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Old 4th August 2002, 05:59 AM   #4
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Default Series Inductor Power Feed

Nelson made a recent comment that caps should be in both the outboard psu and in the ampplifier enclosure, and large value series inductors between.

Regards, Eric.
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Old 4th August 2002, 06:07 AM   #5
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Woops, I forgot-- you'll also want separate bridge rectifiers for each monoblock, and because of that, you must have filter caps for each monoblock anyway. Not necessarily inside each monoblock, though.

Putting the filter caps as close to the audio circuit as possible (inside each monoblock) will filter out the noise the wire going to the power supply with gather. Any long wires in audio circuits will inevitably pick up your favorite classical radio station, not to mention long wires are the playground for runaway oscillations.

To tell you the truth, because I was told it is a good idea to put the filter caps as close as I can to each audio circuit, I have never observed the effect of doing otherwise. =)

Will
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Old 4th August 2002, 06:14 AM   #6
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Default Short Antenna Wires

Altaic, the RF pickup is a function of the length of the connecting wire and the impedence loading the wire.
The psu caps will function as a dead short to any signal induced into the wire, so for power supply feeds RF pickup will not present as a problem.
If the inductors suggested as above are included in the amplifier cabinets, then you should not ever have a problem.

Regards, Eric.
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Old 4th August 2002, 06:33 AM   #7
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so should i build the psu as in the design and just add more caps into the monoblock, or can i get away with less caps in the psu? How much will the capcitance or inductance of the wire affect the amp? Should i try to make the wires as short as possible, say 5 or 6 feet?

thanks,
ben
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Old 4th August 2002, 07:05 AM   #8
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I don't have direct experience with the following idea, and there may be a reason why it wouldn't be a good idea that hasn't occured to me, but here's my thought.

If the bridges were to be placed in the amplifier cabinets, the connection between the main PSU (now just the transformers and primary circuitry) will be the secondary AC. This can be cabled to each amp cabinet without a problem and rectified as soon as it enters the mono blocks. This would also isolate the transformers and their associated magnetic field issues from any DC lines. This being an integrated amp (kind of a contradiction in concept), the PSU cabinet would also house the pre-amp transformer and its secondary AC would be cabled to the pre-amp unit.

Maybe someone can shoot some holes in this idea. It's just a concept at this point. I don't know of it ever being done this way before.

Rodd Yamas***a
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Old 4th August 2002, 07:28 AM   #9
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My design goal is to keep the audio signals as pure as possible (i know its quite generic, but thats what i'm aiming to do)

my options were to make a pre amp/ possibly with an external power supply, and then seperate monoblocks, this would require 4 chassis to do, Also part of the signal would still be exposed to the transformers (in the monoblocks)

My reasoning is if i take an "integrated amp" and seperate the power supply and channels as much as possible, this will improve the quality greatly, this is just a complete guess for now, and i'm hoping to experiment with it.

Like i say my electonics experience is fairly limited so i am wanting to modify an existing design. Any ideas on were to start from would be much appreciated. My goal is to get 200 watts class A output.
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Old 4th August 2002, 07:34 AM   #10
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Rodd, you'd want to keep AC as far from inputs as possible, otherwise there will be lots of noise on the inputs. If you have the bridge rectifiers in each amp enclosure, you have to make sure all power wires are kept away from input wires. It's easier to put all of the bridge rectifiers in the psu enclosure and not have to worry about it.

Will
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