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Old 24th March 2005, 02:53 PM   #11
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show them pics and they laugh
Well Yves, what kind of pictures do you show them?

Rather bring the product, that should make them cry!
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Old 24th March 2005, 04:36 PM   #12
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Originally posted by Yves Smolders
You should put him in his place!

This is the mentality I'm meeting at my local hifi stores as well... show them pics and they laugh, no way, no way...

Some people are rusted(sp?) in principles

That's the reaction I'd expect from them exactly. Just think, if they actually did understand it, when done laughing, they'd go to the backroom and cry.

"What does it do, how good does it do it, how much $?? Sniff..... excuse me."

They're more interested in selling LEDs, boxes with big goofy LCD displays for an arm and a leg, and something with somebody's signiature stamped on it. Quality audio entirely optional, and not very likely.

Nope, they're not happy to see you walk in there with that kind of thing.

You have to know their principles differ widely from your own.

Anyway, ten years from now they'll know enough about them to be able to say "yeah, ok, but those are just for subwoofers".

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Old 24th March 2005, 09:31 PM   #13
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Originally posted by km

>I printed the manual of the Zappulse cause it's has more information about Class D amp (hopefully Hypex can produce a manual that contains much information like the one for Zappulse) just to show him that an amplifier that small can produce that much power.>


did you test it?

best rgds - karsten madsen -
prove what? test what? the Zappulse manual?

and regarding the UcD400 amp, it's not yet finished

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Old 24th March 2005, 09:52 PM   #14
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my manager is a very nice guy, he teaches me a lot and I know he have a lot of experience with regards to engineering and electronics circuits

although class-d amp is not a new technology, the application of it is not as common as class a/ab amplifiers, hopefully once i finished the amp and proved to him that it can produce atleast 300+ Watts RMS he'll consider reviewing the development of class-d amplifiers

the power supply that i'm building will use 800VA w/ 40V dual sec. transformer and 8 x 6800uF United Chemi-Con SMH series caps

mosfet on the UcD400 is Fairchild Semi FDP42AN15A0

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Old 25th March 2005, 06:02 AM   #15
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These MOSFETs can handle 150V, 35A... So there you have it.

I was also wondering about that. The Mosfets look so tiny compated to the beasts you find in class AB amps. Usually there are four, sometimes eight devices used for stereo operation.

Here it's coming from 2 little mosfets. It's truly amazing what these small boards do.

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