"Reference" TDA1541A DAC with I2S-BUS architecture

[studiostevus]

By the way, Oliver,

How is that EC-Designs output stage coming along? Have you built it already?

[dvb-projekt]

Yes. I will post a few pictures of it. It sound´s real good, but i am glad to change back to my Tube-I-zator.

It is the difference between good sounding and a live feeling and the latter is what i want

[gabanyayaya]

I finish testing my 3.3V regulator yesterday. Thanks to Oliver I manage to complete all this without any fuss. I get sharp 3.3V constant after the mod but there's some kinda a heat...luke warm heat after initial start (few minutes) at the heat sink and the current adj. resistor. Is this normal Oliver???? Heat sink size is around 600mmX400mmX150mm.

[dvb-projekt]

Originally Posted by gabanyayaya

I finish testing my 3.3V regulator yesterday. Thanks to Oliver I manage to complete all this without any fuss. I get sharp 3.3V constant after the mod but there's some kinda a heat...luke warm heat after initial start (few minutes) at the heat sink and the current adj. resistor. Is this normal Oliver???? Heat sink size is around 600mmX400mmX150mm.

Hi gabanyayaya,

perfect to hear that every works fine.
Just to verify, here again the recommended mod´s:



Please tell me the voltage over the 5W resistor and it´s value.

[LucasAdamson]

Hi Oliver,

I am looking to buy a transformer or two for my DAC, and a Hong Kong R-core supplier says he can make one with all of my requirements. He wants confirmation of the voltages and ampages I asked for. I thought I'd better check before confirming:

Hello,I can customize this kind transformer for you, according to your requirements,I think the parameters as following is ok:

Input voltage:AC 240V

Output voltage:
0-24V (2 lines 400ma) for -15v DAC
0-12V 0-12V 0-12V 0-12V (8 lines 400ma) for +5v -5v DAC, +5v Analogue, +5v Teralink X2
0-12V (2 lines 2A) for Tube-I-Zator heater
0-120V (2 lines 200ma) for Tube-I-Zator cathode

Output power:9.6W+4.8*4+24+24=76.8W

Does it ok?

regards

[dvb-projekt]

Originally Posted by studiostevus

By the way, Oliver,

How is that EC-Designs output stage coming along? Have you built it already?

The promised photos:

Here the layout overview with the quick made pcb





I had used some small smd resistors

[dvb-projekt]

Originally Posted by LucasAdamson

Hi Oliver,

I am looking to buy a transformer or two for my DAC, and a Hong Kong R-core supplier says he can make one with all of my requirements. He wants confirmation of the voltages and ampages I asked for. I thought I'd better check before confirming:

Hi Lucas,

i would recommend the following values:

1x 0-20V 1A for -15v DAC (20VA)
4x 0-12V 1A for +5v -5v DAC, +5v Analogue, +5v Teralink X2 (48VA)
1x 0-9V 2A for Tube-I-Zator heater (18VA)
1x 0-120V-150V 0,1A for Tube-I-Zator B+ (15VA)

Total: 101VA (W)

With this configuration you have reserves for the transformer.
Also the multiple voltages for the B+ are good, because i have an upgrade cooking, witch needs the 150V tap.

Don´t forget the values are AC and must multiplied with 1.4 to get the DC voltages minus the voltage drop from the rectifier diodes.

[LucasAdamson]

Originally Posted by dvb-projekt

Hi Lucas,

i would recommend the following values:

1x 0-120V-150V 0,1A for Tube-I-Zator B+ (15VA)

Also the multiple voltages for the B+ are good, because i have an upgrade cooking, witch needs the 150V tap.

Thanks Oliver, yes I certainly did forget the rectifiers. Doh!

Regarding the Tube-I-Zator B+, how can there be multiple voltages on a single pair of AC lines? Surely I must choose 120 or 150 vac, no? Also, does 100mA really leave enough surplus for the transformer AND your upgrade?

[dvb-projekt]

Originally Posted by LucasAdamson

Thanks Oliver, yes I certainly did forget the rectifiers. Doh!

Regarding the Tube-I-Zator B+, how can there be multiple voltages on a single pair of AC lines? Surely I must choose 120 or 150 vac, no? Also, does 100mA really leave enough surplus for the transformer AND your upgrade?

For the B+ you select only one tap, yes. The 100mA are absolute enough.
The 6N2P-EV has an anode current from 2.3mA±0.9mA for each triode, so we have four triodes with an absolute maximum of 12,8mA.

[LucasAdamson]

OK, so the 0-120-150 thing, to be clear:

Is that 4 lines like this: 0-120, 0-150 each at 100mA? This will allow 120v for the B+ and 150v free for whatever you have so intriguingly "cooking."

Sorry if I am being stupid. I just want to be clear before I order the thing.