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Class D Switching Power Amplifiers and Power D/A conversion

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Old 28th January 2005, 09:55 PM   #1
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Default Sounds good, i like it, you may appreciate too.

I bougth this Phillips, MCM590, some International Model, the one you may find everywhere...constructed in Holland, and imported in parts to be assembled in the destination country.

It is producing 15 volts of audio over 4 ohms, distortion may be something alike 0.5 percent when reach -20 dB above maximum, of course.... reaching -10dB, it may distort around 1 percent, and will remain the same till the top maximum volume.

Consumption, marked behind the set is 125 Watts, but it have some lamps, the old ones, filament lamps, not LEDs, and those have enormous consumption.

It is too much heavy to use some switching supply, i think a big transformer is inside, as the Central control weigth is around 5 Kg...maybe 10 pounds, not sure.

Headphone output have one relay switching when you plug the headphone...it is a 6W, 10 percent maximum distortion, 22 ohms traditional chip audio amplifier.

The line in, or auxiliary inputs are awfull...sounds not good.... remember some tape deck sound.

I am happy with it, i cannot call it Hi fidelity, as have not a flat response to make blind comparison...always some effect is on, so, impossible to compare in a fair way....but sounds good, i can call Hi Efficiency....Hi technologie.... Hi everything you want...but i cannot say hi fidelity, as i could not compare, as equalization on is creating some problem.

Output amplifier have a low noise fan, small heatsinks, and the board seems small....could no open 18 monthes guaranteed, covering everything, except Nuclear War!

I will put some text and 2 images.

I am waiting some discrete design to assemble Class D at home, sun or latter it will appear to us...something without chips....old good way, using soldering iron...and big parts..hehe

I am Brazilian, so, English not good...sorry guys!

regards,

Carlos
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Old 28th January 2005, 09:56 PM   #2
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Default This text is interesting, a friend sent me, do not know if i have

Started in this forum (the text)....maybe, but as i did not read entire class D forum yet, i cannot guaranteed not already published.

regards,

Carlos
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Brazilian Airways Christmas Message to all of you!
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Old 28th January 2005, 09:57 PM   #3
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Default Last image, the real amplifier, mine unit.

Here is some close up....medium close.

regards,

Carlos
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Old 28th January 2005, 10:53 PM   #4
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Hi Carlos,

So that thing uses UCD does it? I wouldnt' judge the technology based solely on how they've implemented in there, for obvious reasons.

Do you plan on attempting to modify it at all?

There are already some very interesting class d projects you could try that involve soldering iron and no chips/modules, including UCD.

Regards,
Chris
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Old 28th January 2005, 11:03 PM   #5
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Default ClassD4sure, no, i do not want to modify

I am very satisfied with that equipment.

But i want, also, to try something discrete too.

I cannot say it sounds perfect, as speaker always disturbing as week part in the hi fidelity chain...but i think, research will develop more and more.

It can be, if not already are, the sound of our future.

I have to read all entire forum...i did not done it yet, only Solid State, this one i read it 4 times... all threads...Ufah!

regards,

Carlos
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Old 29th January 2005, 12:06 AM   #6
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Boy, am I disappointed that you would buy a piece of **** like that.
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Old 29th January 2005, 12:31 AM   #7
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I may have jumped the gun here due to a misunderstanding on my part.

I doubt this uses a UCD modulator. It's probably some IC based circuit right?

Anyway Carlos, if you start reading this forum you're going to see alot about UCD, well worth paying close attention to.

I would expect it to be ... a little better.... than what you got there

3000W PMPO...... heh, will they ever stop this stupidity??

Regards,
Chris
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Old 29th January 2005, 12:34 AM   #8
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Bill, do you get your jollies p!ssing in childrens' cereal at the local gradeschool?

If the man likes it, leave him alone!














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Old 29th January 2005, 12:39 AM   #9
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Quote:
Originally posted by Stocker
Bill, do you get your jollies p!ssing in childrens' cereal at the local gradeschool?
I did until I discovered that I was getting in your way.
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Old 29th January 2005, 12:54 AM   #10
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Default Yeah! bill, always flying in circles... waiting some nut!

But you are welcome in the places i am, as i like you very much....no!...it is not the same love i have to Grim...., he is squared!.... i really like you, you are funny, full of sense of humor, you know how to turn threads happier, to move us to have some fun, to broke all those snobish we have:

You always laugh when we say:

" I beg your pardon Mister"...ahahaha...i now what you mean.

This way, as you can understand second and third intentions....maybe fourth intentions "inserted" "under" the text, i am sending you again.... to make you happy.

A gift.

My Dear Fitz

regards, happy to see you here... there are more hot sausages man!

Carlos
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