Pushing the limits of TDA1543 NOS DAC

[Destroyer OS.]

Call me a putz... I want a USB PCB board that I can solder parts onto.

[Peter Daniel]

Originally Posted by marcus1

Thanks Peter - just to clarify; do you mean that VD+, VA+ and M1 on the CS8412 chip can be fed by a single AN8005 regulator rather than two?

Those two AN8005 are bare minimum, I was rather talking about replacing them with discreet regulators, which is not always needed.

[Ivo-Cici]

Hi
It’s possible to replace a CS8412 chip with CS8420 chips ???
I can't find more CS8412/14 chip.
Thanks
Ivo-Cici

[SomekPoland]

No, you can't. CS8420 is sample rate converter, not a S/PDIF reciever, like CS8412/14.

[uncle_leon]

CS8412 is plentifully available on ebay. Look for the CS8412CP if you are after the DIP version.
Ebay search for CS8412.

[Ivo-Cici]

Thanks Guys

[uncle_leon]

Originally Posted by northernsky

Thank you! Now I know how to spend Christmas holidays... at least studying the diagrams. I'll try.

Renato

One more thing has just occurred to me, that I forgot to mention, regarding the simplified schematic above. It will be obvious to most, but I will say it, just in case - the output capacitors (C13 and C14) need to be non-polarised, so either film caps or non-polar/bi-polar electrolytics. The value is not very critical - you could use 10x bigger or smaller without running into any serious trouble.

[Hierfi]

A point of clarification that seems likely to have already been addressed. I have one of those passive output NOS 4x1543 DAC's. As the TDA1543 literature calls for an inverting opamp connected to the output is it reasonable to conclude that these passive output DAC's require an inverter on the data line to produce the correct phase?

[BachAudioDK]

I think you are correct on the assumption that the phase is reversed when using passive I/V conversion. But does it matters to you ? You could try to phase reverse your speakers and listen if there is any difference on the same music track.

Cheers
Flemming

[uncle_leon]

Originally Posted by Hierfi

A point of clarification that seems likely to have already been addressed. I have one of those passive output NOS 4x1543 DAC's. As the TDA1543 literature calls for an inverting opamp connected to the output is it reasonable to conclude that these passive output DAC's require an inverter on the data line to produce the correct phase?

TDA1543 does reverse the absolute phase. Some people can hear the difference, but most do not. If you really want your DAC to produce the correct phase, you can either add an inverting opamp at the output, or use something like SN75179 to invert the digital input - but honestly, reversing speakers cables is much more sonically transparent...