TAS5706 simple full digital stereo amplifier

[KOON3876]

Originally posted by iampivot

Just an optical rotary switch,

... I'm not so interested in?
Current code (only A/D volume voltage, write to register) works enough. and it will not improve sound quality, just a gimmick.

The only problem using carbon cheap volume is, people has "fantasy" that carbon pot volume control spoils signal quality.
Of course TASxxxx is not effected by volume controler. no signal pass through pot. TacT's volume control is marketing issue.

anyway PIC18F1320 has enough available pins, cheap, simple and C programmable. So if you refer my design, you can add Optical rotary volume control.

[KOON3876]

Front / Rear panel was ordered. estimated arrival = Apr 14.
I'm using http://www.frontpanelexpress.com/

Enclosure is Hammond 1455Q1601, for 120mm / 160mm sized board. I like this kind of enclosure.

[iampivot]

Originally posted by KOON3876
Enclosure is Hammond 1455Q1601, for 120mm / 160mm sized board. I like this kind of enclosure.

You're still using a lab PSU? What about a a case which can house a PSU as well?

[KOON3876]

Originally posted by iampivot
What about a a case which can house a PSU as well?

oh, you mean large 19 inch chassi with AC inlet?
I don't feel all DIY amplifier should have huge trans, capacitor inside, especially current class-D. (of course also I was making kind of huge chassi amp several years ago...)

by separating PSU and amplifier,
(a) Like expensive DAC or preamp, power supply noise separation
(b) free selection, from AC adapter, Lab DC, battery, eco solar power, hand cranking generator.
(c) compact and cheap.
(d) easy to build enclosure.
there are many pros.

and for Lab DC supply, they are safe, low-noise, reliable, accurate. I love them, more than my handmade.

[langtuhanoi]

Full digital amplifier with digital input such as I2S or SPDIF is excellent choice for natural sound because it bypass DAC, Preamp and Power Amp
But the power of this chip TI is very low: 20W
Which are others solutions for full digital amplifier???

[iampivot]

Originally posted by langtuhanoi
But the power of this chip TI is very low: 20W
Which are others solutions for full digital amplifier???

There's another digital amplifier project described here; Anyone interested in a digital amplifier project?

This one also uses TI chips, but different ones where you can use different amplifier modules.

Koon3876 also has another digital amplifier project called tas-4i. Just check his homepage, http://koonlab.com.

[langtuhanoi]

I think one other solution:
We can use this chip for Preamp full digital what accept I2S or SPDIF input of CD transport. This Preamp digital have analog ouput (RCA) or analog ouput balanced (XLR) and we can use Power amp class D or anything for one big system
Is it OK?

[iampivot]

Originally posted by langtuhanoi
We can use this chip for Preamp full digital what accept I2S or SPDIF input of CD transport. This Preamp digital have analog ouput (RCA) or analog ouput balanced (XLR) and we can use Power amp class D or anything for one big system

The main idea of this amplifier is that it does D to A conversion directly into a high-power analogue signal that can drive the speakers directly. If you want to extract a low power signal to further amplify in a class D stage or any other amplifier stage which takes an analogue signal, then there are other options that might work just as well.

[KOON3876]

20W is enough power to make your neighbor MAD.

you can search TAS5261, for high power.

[iampivot]

Originally posted by KOON3876
Current code (only A/D volume voltage, write to register) works enough. and it will not improve sound quality, just a gimmick.

How does the current volume control work? Does it sample the position / voltage across the analogue potmeter?