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Old 19th October 2012, 08:58 AM   #3481
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Quote:
Originally Posted by Esperado View Post
Did-you forget the inertia of the cone ?
And remember, if you send a high level 22µs pulse in-it, you will get awfull cone fractioning effects (distortion, etc...).
More than that, if you change the emitting surface at each level step, you will change the dynamic response curve a very strange way.
What about a plasma speaker, there is no inertia and and no frequency limit.

Sorry we are getting off topic.
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Old 19th October 2012, 10:08 AM   #3482
shaan is offline shaan  India
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Will the plasma speaker not produce the jaggies even more profoundly? I mean, plasma or whatever, the transducer has to move from zero to say 10 in a microsecond, then go back to zero again and then the cycle repeats.

My question is how, if possible, will the transducer interpolate the steps? Will the speaker throw a 44.1KHz square to us, with the sine hidden in it?

I have no knowledge of class-d, but these things just came to mind.

Anyways, I'm now in my friend's house arranging for a musical evening and will visit my village tomorrow!

How's cambe's and abetir's SSA going?
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Old 19th October 2012, 10:30 AM   #3483
MiiB is offline MiiB  Denmark
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the speaker will for sure be a lowpass filter.... no speaker can make a square.
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Old 19th October 2012, 12:18 PM   #3484
Salas is offline Salas  Greece
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Quote:
Originally Posted by Esperado View Post
I had suggested that some time ago. And said that Class D, T etc. is the future.
Because it is near the digital domain, and, we can love-it or no, but digital will take all the audio market. We can imagine a direct oversampling/undersampling power converter, driving directly loudspeaker.
Because is is less Dependant on the qualities of the parts, so more industrial. So less expensive. and depend mainly on the design's intelligence and care.
Because active devices goes more and more fast; so it will be more and more accurate and easy to filtrate the switching frequency.
Because we are too many on this planet, and energy will become a big problem.

I have an idea, paralleling class D devices, with clock delays (oversampling) , on how to overpass the switching frequency limitation witch is the major problem of class D amps for the moment.
Have you listened to this French design? Talks some analogue steering of the class D. Devialet D-Premier, High End Audio Performances - DEVIALET
It was in the local audio show last week. 12K Euro I think.
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Old 19th October 2012, 01:10 PM   #3485
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Quote:
Originally Posted by Nico Ras View Post
What about a plasma speaker, there is no inertia
There is inertia, the one of the ionized air to be moved. I had evaluated a "Ionovac" tweeter. It was very bad: modulation of a noise by a signal.
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Old 19th October 2012, 01:31 PM   #3486
Salas is offline Salas  Greece
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Quote:
Originally Posted by shaan View Post

SSA going?
My friend's point to point one is going well he tells me. After he bypassed the 2X1N4148 analogous IR LED with Black Gate capacitors he had kept from older days, the sound opened up. He also had to drop the current in the BD transistors because they opened at about 25mA getting hot. He put 270 Ohm instead of 220 Ohm from base to rail and the spare 220 Ohm he put in series with the 1K2 current feed resistors. Now he got ~10mA on the drivers and they cooled down enough. He never gets more than 30mV offset after it had played for long or stayed on overnight. I hope I will visit him in next week to listen and to show you photos even. Have happy holiday!
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Old 19th October 2012, 01:36 PM   #3487
masood is offline masood  India
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dear shan,
I have etched this pee cee pee .but it is hard to me make holes .I tried to make holes but it is not finished .thanks for giving pee cee bee image(COPPER TRACK) thanking you yours ever masood
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Old 19th October 2012, 02:24 PM   #3488
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To reduce( out of topic here) comments about class D amps, and continue to share ideas and exchanges about this interesting subject, i have opened a new thread:
Exploring class D improvements ideas.
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Old 19th October 2012, 02:28 PM   #3489
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Hi everyone,
the lateral I've order arrived today...
Sorry for repeating this question
which one should I make?
I'm thinking Nico's SSA & Shaan's SSA
what is the big difference of it?

Shaan maybe I will combine your SSA with Nico's one, please give your permission..?
Click the image to open in full size.

If it is success, it can be used for two or more schematic in single board...
I need some input please
I will make my own board, I will try as symmetric as I can do.

Regards
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Last edited by JOHN BALI; 19th October 2012 at 02:31 PM.
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Old 19th October 2012, 08:14 PM   #3490
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The Laterals shown in the picture is a bit suspect. They could be fake or at best Chinese; the latter cannot handle the same current or dissipation as the Hitachi originals.
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