"Reference" TDA1541A DAC with I2S-BUS architecture

[dvb projekt]

Oliver,

Will my DC coupled B1 buffer powered by a Salas shunt reg work as an output stage? It is a unity gain, impedance correcting buffer based on 2SK170s. It would be positioned in the pre-amp, the next box down from the DAC in my system.

If so, what do I really need to build a DAC with USB and optical inputs?

1. A teralink converter,
2. A Power supply board,
3. Main Shunt reg board
4. DAC module board

Is that it, discounting box, components etc.?

Many thanks
Lucas

Hi Lucas,

i am building the DCB1 blue version at the moment

Additional you need an I/V output stage e.g. like my Tube-I-zator module or the new I/V stage from ecdesigns (see attached picture). The DCB1 comes after this stage.

So you need:

2x +/- Power Supply Modules (+5V, -5V, -15V)
1x TDA1541A shunt module
1x I/V output stage
1x Teralink X2 module (only USB input)
1x SPDIF to I2S module e.g. from Twisted Pear Audio with additional Toslink module


Best regards,
Oliver

 

[studiostevus]

Is it correct that ecdesign's output stage does not need any additional psu?

 

[dvb projekt]

Yes.

 

[LucasAdamson]

Hi Lucas,

i am building the DCB1 blue version at the moment

Additional you need an I/V output stage e.g. like my Tube-I-zator module or the new I/V stage from ecdesigns (see attached picture). The DCB1 comes after this stage.

So you need:

2x +/- Power Supply Modules (+5V, -5V, -15V)
1x TDA1541A shunt module
1x I/V output stage
1x Teralink X2 module (only USB input)
1x SPDIF to I2S module e.g. from Twisted Pear Audio with additional Toslink module


Best regards,
Oliver

Do you mean that I need 2 of your power supply boards, or does one board contain both?

 

[dvb projekt]

Do you mean that I need 2 of your power supply boards, or does one board contain both?

You need two board´s because you have minimum three voltages.
If you would like to add a 2nd +5V line for additional parts (USB to I2S ect.),
you could use the last line of the 2nd board.


Best regards,
Oliver

 

[morpheous]

Hi Oliver,


the transistor 2SK170BL matched ? In this case I don't need matched correct ?

Regards

Francesco.

 

[dvb projekt]

Hi Oliver,


the transistor 2SK170BL matched ? In this case I don't need matched correct ?

Regards

Francesco.

Hi Francesco,

yes correct.

 

[AlanElsdon]

Oliver,

All my boards (and the mundorfs) all arrived - thanks.

Alan

 

[ferynov]

Yes Oliver, I have MUR 1520 onhand , and waiting MUR860 on the way ... on MUR820 I must buy 5 and multiply ,10,15 ..etc in farnell . thanks.

 

[LucasAdamson]

Yes Oliver, I have MUR 1520 onhand , and waiting MUR860 on the way ... on MUR820 I must buy 5 and multiply ,10,15 ..etc in farnell . thanks.

For the regs, the MUR860 or 820 are much of a muchness. Nothing in it really.

 

[studiostevus]

Ian, is your offer still on for the hexfreds? I PM'ed you some weeks ago but no reply...
Thanks

 

[LucasAdamson]

For those who want to build this DAC and don´t have a TDA1541A DAC chip,

ebay seller cusackmusic sells new NOS ones

HERE
​

I've just bought the very last one he had listed! The listing said he had bought 450 of them, and that 433 were sold. The other 17, who knows....but the listing is over now.

 

[morpheous]

Hi Ian, I am also interested to know if you are still selling the Hexfreds set. Please let us know.
Best regards,


Francesco.

 

[Ryelands]

I'm assembling parts for this design pending arrival of the PCBs but can't readily source the Kiwame 220K, 5W resistors. I can get 200R and 240R. Would either be an acceptable substitute?

Neither can I find and 270uF 16VW Sanyo OsCon caps. Can anyone recommend a UK distributor without the usual min. order penalties?

Apologies for any trouble and thanks in advance . . .

 

[studiostevus]

I got the oscons on ebay from Hong Kong.
Seem ligit, low transport cost as well (2 USD or so)

On the other hand I am still lacking suitable diodes...... anyone?

 

[LucasAdamson]

Sanyo OsCon caps are low ESR, and can easily be substituted with the equally excellent Panasonic FM low ESR caps, available everywhere.

 

[Ryelands]

studiostevus and LucasAdamson:

Thanks for your comments. As it happens, I've already ordered Panasonic FMs but thanks for confirming my choice. (I even RTFM'd on shunt regulators over the weekend to sort out my other query.)

 

[dvb projekt]

I'm assembling parts for this design pending arrival of the PCBs but can't readily source the Kiwame 220K, 5W resistors. I can get 200R and 240R. Would either be an acceptable substitute?

You could use any 5W resistor with a value around 220K for the bleeder resistor.

If you use a smaller value, the caps discharge a bit quicker if you power off.

Hificollective have the 200K and 240K in stock.

Best,
Oliver

 

[LucasAdamson]

An excellent replacement for the SEPC, for anybody that can't source them. Farnell UK, but they are US stock, so best for people to buy direct from Farnell US really.

Bear in mind that they are only rated at 10v.

UNITED CHEMI-CON|APSA100ELL271MHB5S|CAPACITOR ALUM POLYMER 270UF, | Farnell United Kingdom

 

[gabanyayaya]

Oliver

Is it necessary to bypass each Hexfreds diode with 0.1uf? What if to use much lower values like 0.01uf or just leave it empty?

Have you done comparison with and without it? There's a debate on this section previously..