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Old 2nd May 2002, 09:10 AM   #1
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Question TDA1543 anyone tried this?

Hi,

Has any body used this DAC solo, ie only one chip instead of the four Kusunoki used? I've tried it with CS8412 Zero OS with a resistor doing the honours I/V wise performance so far is, well, not good! I'm trying different values of R for I/V any experiences out there?

Mozfet
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Old 2nd May 2002, 11:41 AM   #2
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hmmm, not yet.
Got a few in my drawer.

You got to use the TDA1307 to convert it to bit stream !

I once heard from an audiophile that he used the bitstream converter with an 7th order filter as DAC.


grtz

Simon
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Old 2nd May 2002, 10:23 PM   #3
guido is offline guido  Netherlands
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Mozfet,

Tried with one, the objective was to get some sound out of it, not to make the best dac possible.

So i built in into an old philips CD player, hooked it up to the 7210 decoder. Powersupply from the CD player, multipot resistors for i/v conversion (only one chip, 1/4 of the current, resistor needs to be 4 times the value used in the schematics with 4 1543's).

Well it works, but when we tried it at friends installation, we heard some distortion. Could be that his installation does not like the high frequencies. I have to listen more to it to get a better picture (compare it to my marantz '63 1-bit).

What i did learn was that it is interesting enough to proceed with some 1541 S1's i have waiting.

Happy tweaking,

Guido
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Old 2nd May 2002, 10:27 PM   #4
guido is offline guido  Netherlands
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Simon,

I don't get your post at all ?? A 1543 is the dac and you only need one.. Use an old cd player to get the I2S signals or a crystal receiver. That's it.

Guido
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Old 2nd May 2002, 10:48 PM   #5
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Think that Simon's got the 1547 mixed up with the 1543. The '47 is a BitStream dac and the '43 is a good 'ol cheap 16 bit 8 pin dac. For us in the states Magnavox had a model 462 which was a decoder to dac upsample-filterless player and that was in 1986? It might be fun to poot around on.
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Old 3rd May 2002, 12:44 AM   #6
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Pooting is all they are good for.

Jocko
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Old 3rd May 2002, 02:41 PM   #7
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Unhappy agreed!

Well I gotta agree with Jocko Homo on this, it does sound pretty bad, I still like the TDA1541A S1 though! I will try 4 in parallel later.

Mozfet
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Old 28th May 2002, 01:55 AM   #8
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Original I ever see 680 Ohms for pin 6 and 8 and pin7 connect by R 330 Ohms .but my friends think the sound is bad he tune R pin 6 and 8 = 512 Ohms and Pin 7 =462 . I think u to try is values.

I ask continous . What voltage to use about TDA1543 I read on TNT he use 8.8 Volt . it max for it and he talk the sound is best.
Who use this value .
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Old 28th May 2002, 08:53 AM   #9
rbroer is offline rbroer  Netherlands
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I've used 3 parallel TDA1543's with passive I/V and it sounds very sweet, "open", but thin.

Another experiment with just a singe TDA1543 running at 5V, no bias current (resistor) and this active I/V stage sounds like the passive I/V one, but with more detail and bass, slam and control.

Remember with passive I/V, you give up DAC output voltage compliance bigtime.

Regards, Rudolf.
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Old 28th May 2002, 09:07 AM   #10
rbroer is offline rbroer  Netherlands
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I forgot:
You need to insert resistor (1k or so) from each dac output to ground to get it working and bias the fet as well. No constant current source needed here, the feedback loop keeps dac outputs at voltage compliance.
Opamp type still shines through, I like LM6172 here much more than OPA2604, OPA2134, AD826.
One can also make the opamp a DC servo, I would use CCS then in stead of resistors to draw some bias current.
Use coupling cap for outputs.

Rudolf.
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