TAS5706 simple full digital stereo amplifier

[KOON3876]

Current source you can see at my site.
TAS5706 only see written value, don't care where it comes from.
(volume or IR remote or encoder)

• Delay100TCYx(5);
  OpenADC( 0b10100111,0b00000001,0b01111110 );
  Delay100TCYx(5);
  //Read Volume
  ConvertADC();
  while( BusyADC() );
  ADresult = ReadADC();
  CloseADC();
  
  CurrentVol = 0xFF - (ADresult>>2);
  
  if ((PrevVol < (CurrentVol - 0x03)) || (CurrentVol + 0x03 < PrevVol) )
  {
  WriteData = CurrentVol; //set master volume adequate
  I2CWrite(TAS5076_ADDRESS, 0x07, WriteData);
  PrevVol = CurrentVol; //record volume
  }

[KOON3876]

Panel arrived, now she lives in nice house
This enclosure is only a little bit larger than CD.
Hi res photos were posted to my web.

I forgot to order RCA terminal

[KOON3876]

Listening with Ni-CD battery. (7.2x2=14.4V)
Very nice
More detailed and little bit powerful.

I recommend RC Ni-CD or Ni-MH ex, (http://www.radioshack.com/product/in...ductId=2147160) for any Audio battery, by their low internal resistance, and high output current.

This small system(Pana CD, TAS5706, QUAD L-ite) sounds {maybe} better than (Pioneer Elite Univ-TacT S2150-QUAD 22L) I had before. I can dive into notation one by one so analytical, base beats my stomach.

[jkeny]

I knew you'd like battery power even on an amp with reasonably good PSRR - more dynamic and quieter - I found the same on the Panasonic SA-XR57 with TAS5076 & TAS5182 which is non-feedback & zero PSRR!

The great thing about these amps is their efficiency & the ability to use batteries - I have a 12V SLA 7aH battery permananently on, powering the output stage (7 * 100W) for 48 hours & no drop in battery output voltage

[soundcheck]

Koon.

Are you using the EVM controller board (MC57xx) and the TI control software to control setup and registers of the 5706?

BTW regaring battery discussions: I am running my Tripath 2020 currently with a Northstar NSB90 battery. It comes with 2mR resistance and it is very fast compared to other batteries.
Any smaller size car batteries ( >25mR) gave worse results.

Cheers

[luka]

Hi

How much was that battery, coz here are pretty damn expensive, few 100€, but for that you get battery that can give high current few 100A without much drop of voltage

[soundcheck]

Yep. They are expensive. I paid 180€ a piece 2 years back.
I got two of them: One for my DAC and one for my Amp.

1. I don't want to start reloading batteries everytime I heat up
my rig. The voltage stays rocksolid while playing.
2. Reload cycles degrade ( battery gets higher resistance) your battery over time, which means that small batteries will degrade much faster.
3. Absolute NoNo for low quality batteries or old/used batteries.

Have a look a the car audio scene. Perhaps you find similar less expensive types of batteries nowadays.

Cheers

[jkeny]

By Paralleling a low impedance capacitor to a battery do we not achieve a low impedance load anyway? So is there a need for such a low impedance battery?

[KOON3876]

Originally posted by soundcheck

Are you using the EVM controller board (MC57xx) and the TI control software to control setup and registers of the 5706?

how did you thought EVM board around amp?
I wrote PIC18F source code by myself.
http://koonlab.com/TAS5706/Main_01.c.txt

NSB90 looks great. huge battery has lower resistance(paralleled internally/chemically).
Maybe some difference between Pb based battery and Ni based battery by chemical reaction speed and energy. Now I can recommend Ni-MH (For Radio Control Toys) by it's peak power.

[soundcheck]

Originally posted by KOON3876


how did you thought EVM board around amp?
I wrote PIC18F source code by myself.

Koon.

I was just wondering how to get a connection to the chip to set the registers?

My understanding was , to compile your source code on the PC.
Running the programme on the PC would set the registers via -- whatever Interface!?. How does the PC connects to the board?

You need to understand that - I havn't done hardware programming until know.


Cheers