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Old 23rd March 2008, 04:27 AM   #1
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Default TAS5706 simple full digital stereo amplifier

Now TAS5706 amplifier is playing great music from small board

I think TAS5706 can be final solution for Stereo Full digital Amplifier for DIY.

please see my website for detail, and hi res photos.

If anyone want to be group by manager, I can provide ExpressPCB CAD data. ( I don't want to be.. )
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Old 23rd March 2008, 06:17 AM   #2
TheMG is offline TheMG  Canada
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I'm impressed by the fact you managed to etch your own PCB with enough precision for that IC!

What method did you use? I've been using the transparency/light method and it isn't accurate worth a darn.
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Old 23rd March 2008, 07:11 AM   #3
luka is offline luka  Slovenia
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Hi

It can be done, here are 0.5mm with 0.5mm of space and 0.25mm with 0.25mm space

Click the image to open in full size.
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Old 23rd March 2008, 11:28 AM   #4
Pano is offline Pano  United States
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Nice work!

Are you using the on chip volume control? Is that working for you?
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Old 23rd March 2008, 01:35 PM   #5
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Wow you're working hard on this! Impressive!

A question; does using SMD components provide advantages concerning RF? I'd assume that with a low density PCB like this it would have been possible to make use of larger sized resistors, which would make it a bit more accessible for DIY'ers?

Wouldn't it make sense to add more ground plane areas on the top side of the PCB, in addition to the bottom?

Also, what kind of power supply would you recommend? A 12v STEPS setup? What's the maximum current draw?
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Old 23rd March 2008, 02:38 PM   #6
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Quote:
Originally posted by TheMG
I'm impressed by the fact you managed to etch your own PCB with enough precision for that IC!
This is made by ExpressPCB, I'm not etching for these years. (messy chemical, drilling...)

Quote:
Originally posted by panomaniac
Are you using the on chip volume control? Is that working for you?
Yes on chip digital volume control works fine, than Apogee DDXi.

Quote:
Originally posted by iampivot
does using SMD components provide advantages?
more ground plane areas on the top side of the PCB?
Also, what kind of power supply would you recommend?
What's the maximum current draw?
Soldering 0805 is not difficult, and it can provide small footprint / without hall, wireing freedom / cheaper / small storage in my desk.
ground plane on the top works nice at 4 layer board, but small meaning for 2 layer.
Power supply can be 12V, from generic wall adapter to Lab DC power, maximum about 2A. Or you can use Battery, Or if you need more power, you can supply up to 24V.

I'm using small DC Lab power supply, spec 18V/3A. for desktop usage, TAS5706 uses 11V / 100mA.
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Old 23rd March 2008, 06:04 PM   #7
TheMG is offline TheMG  Canada
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Ah, I thought PCBExpress was the software you used. That's what I get for not looking things up.
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Old 24th March 2008, 12:08 AM   #8
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Found the specs for the TAS5706 here; http://focus.ti.com/docs/prod/folder...t/tas5706.html

Datasheet; http://datasheet.digchip.com/477/477-48390-TAS5706.pdf

And a cheesy little video: http://www.revver.com/video/705245/h...ifier-from-ti/ (apparently it's "optimized for hdtvs and media docking stations".)

Can your design take 18v regulated in order to deliver the maximum 20w output?
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Old 24th March 2008, 12:57 AM   #9
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Have you tried using an FM radio anywhere near it?
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Old 24th March 2008, 03:42 AM   #10
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Quote:
Originally posted by iampivot
Can your design take 18v regulated in order to deliver the maximum 20w output?
Yes that's why 5V regulator is switching. no overheating by high supply voltage. you need heat sink for high power.

Quote:
Originally posted by speakerguy79
Have you tried using an FM radio anywhere near it?
no noise. but I didn't try AM radio, see datasheet, there are AM interference related register setting.
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