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Old 5th November 2007, 12:29 AM   #21
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Hey any positive reaction?
like "Yes go for break it! I want to look you screwed up!"

I have no interest about practical or not. Just want to DIY something freak

Now finished schematic, attached is BOM. Not so expensive than I thought.
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File Type: pdf digital speaker bom.pdf (4.7 KB, 122 views)
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Old 5th November 2007, 08:14 AM   #22
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I have attached a picture of an early prototype...
They are still working on it, of course, but its sound is pretty decent. Promising work.

Koon, go for it mate! It certainly is an interesting project.
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Old 5th November 2007, 03:35 PM   #23
lne937s is offline lne937s  United States
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I would love to see this work.

Maybe using something like this for drivers....

http://www.getmad.com/mad_a8.html
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Old 5th November 2007, 05:41 PM   #24
Pano is offline Pano  United States
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By all means go for it!

We are just trying to tell you it's a lot harder than you think. If it weren't, these things would be all over the place.

But do build one, it's such a cool idea. I tried and failed, but that doesn't mean that you will.
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Old 9th November 2007, 03:10 AM   #25
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Thank you!
If it's easy, no value to DIY.
60 drivers arrived. OMG...
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Old 9th November 2007, 03:12 AM   #26
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One block (2 bit in and out) of board. 2x1.4 inch.
I have to copy this 26 times.

From left,
Analog switch and LPF R&C
Differencial Amplifier Rs
OpAmps, Top Differencial Amp & driver, for 1bit, mid 2 LPF, Bottom other bit.
Power Capacitors,
TR and bias Diodes, Rs.
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Old 9th November 2007, 10:44 AM   #27
luka is offline luka  Slovenia
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Hi

Only 26 tmes ?
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Old 27th November 2007, 06:14 AM   #28
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Finished board layout.
too huge..
http://koonlab.com/DigiSP.html
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Old 29th November 2007, 05:40 AM   #29
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I wrote board but too complicated, too large. It should be more simple.

Let's make 5V single supply circuit.
amplifier section will use TPA311, TI's small amplifier.

I need voltage reference, and positive/negative side driving voltage.
Attached circuit can make 1/2Vdd adjusted positive/negative driving signal. (one switch will supply driving signal to each bit section).

Then each bit section can be driven single 5V power supply.
(switch selects between 1/2Vdd and driving signal)
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File Type: png 5v_drive.png (52.1 KB, 544 views)
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Old 5th December 2007, 05:07 AM   #30
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Here is ver.02 schematic.

http://koonlab.com/DigiSP/DSP_SCH02.pdf

Now all circuits work on 5V single supply, amplifier section was changed to TPA2005, TI's small Class D amplifier.
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