High-End Regulated Buffered Inverted GC

[tbla]

the latter must be a useless sack of excrement.

[t.]

Originally posted by carlosfm


My diy (NOS , I2S direct connection) TDA1541A dac, with treble roll-off compensation, sounds very good, dynamic, deltailed, airy, neutral.
Oh, I also have a TDA1543 dac with OPA627+BUF634 output stage.
As I can compare these with almost anything you guys can think of, I know what I'm talking about.
If Peter is talking about his "Ultimate" dac, it's all said, don't need to say more.

Which one of your dacs do you like best?

[Nuuk]

Welcome to an insult-free post

Progress report.

I have replaced the 'new' buffers with the ones from my existing non-regulated IGC and have continued to burn in the new amp.

The bass does go much deeper than with the un-regulated supply and I would say that the top end is slightly brighter too. If anything the mid band is recessed a bit more (or that may be just due to the extremes being more pronounced).

I am currently using 100 uF on the pins of the 3875 so will swap these for something smaller.

I think that a regulated supply may well involve 'tuning' the circuit to give the best performance in a given system. To his credit, Carlos has told us that and it seems to be the case. No 'one size fits all' here.

Carlos, I have a bog-standard 1543 DacKit (Scott Nixon kit) which I would like to put an output stage on soon. Is there anywhere that you have a circuit diagram for yours?

[t.]

Excellent Nick, glad you got the amp sorted
I agree regarding the cap on the LM3875, it alters the sound a lot.

Adding a better output stage on my TDA1543 would be certainly worth trying too


Regards

Leon

[pinkmouse]

To me, this comes down to taste. I know for a fact that Peter is wrong, cos the OPA549 sounds much better than the LM3875, and I know that Carlos is wrong, cos his casework is worse than mine...


al/currently building a (possibly regulated) twin LM3886 for an active Sub...

[pinkmouse]

Oh guys, can we calm down a little please...

[t.]

Originally posted by pinkmouse
To me, this comes down to taste. I know for a fact that Peter is wrong, cos the OPA549 sounds much better than the LM3875, and I know that Carlos is wrong, cos his casework is worse than mine...


al/currently building a (possibly regulated) twin LM3886 for an active Sub...

I have a couple of OPA649's, to be honest I have not tried these yet, does this mean I have another amp to try

[Nuuk]

To me, this comes down to taste. I know for a fact that Peter is wrong, cos the OPA549 sounds much better than the LM3875, and I know that Carlos is wrong, cos his casework is worse than mine...

Hey Al! The moderators are supposed to moderate not stir up even more argument!

But you could have a point - they are both wrong and we are all wasting our time reading this thread!

Is the OPA549 really better than the LM3875?

Have we ever seen Carlos's case work?

Leon - let's have an argument thread over output buffers for the 1543.

[tbla]

I think that a regulated supply may well involve 'tuning' the circuit to give the best performance in a given system.

it's alot about tuning - but please remember that for now you are only referring to the lm338 regulator - if you go for the lt1083 matters are different (or lt1084 peterD).

perhaps this thred needs a bit of regulation too....

[t.]

Originally posted by Nuuk


Hey Al! The moderators are supposed to moderate not stir up even more argument!

But you could have a point - they are both wrong and we are all wasting our time reading this thread!

Is the OPA549 really better than the LM3875?

Have we ever seen Carlos's case work?

Leon - let's have an argument thread over output buffers for the 1543.

I find this good fun, It gives me plenty of projects to try and keep me amused

I am interested in improving my TDA1543, my modded Arcam kills it at the minute