SheldonD said:
But then even Carlos admits that the amp does not sound the best. I tried it and I know too.
In case of hard to drive speakers, I will agree that regulation might provide solution, but I also claim that in case of more suitable environment (efficient speakers), non regulated supply may actually sound better.
Much of the bandwith in this thread was wasted because Carlos argues with me that his LM338 regulated amp should sound better than the battery powered amp. It's his thread, so he can do what he wants, I guess.
carlosfm said:
Actually I am very appreciative that you opened the thread because I very much want to implement your design or something similar. I have no doubt that it will sound very very good if I am able to construct it well enough.
Regulating makes a great deal of sense to get around the cap size problem.
I have been doing things more on the SS side of things but am at present implementing one of BrianGT's kits with my son. It is a very good starting point for him. We are leaving room in the case for regulation. The initial use though will be to drive Fostex FE167E/FT17 that are crossed over 24dB active to stereo subs at 90Hz. Not a lot of power needed by the Fostex that the gainclone needs to deliver at the low end. So I am expecting that the gainclone "classic" will perform enjoyably since it is in it's "comfort zone". So this one may always stay “minimal”.
But then we will turn our attention to building a regulated gainclone, along the lines discussed in this thread. It will be targeted at driving more difficult loads and I expect it to shine admirably.
I think this regulated approach is very appealing and a very useful step forward. Thanks again for your continued contributions.
This perspective is not in conflict with my previously posted thoughts.
I also think that if regulation works as it is claimed so far (of course not form me), it may be very appealing with parallel LM4780 chip, as this chip is mainly directed at higher power (and more dificult loads) applications. I already mentioned to Brian to make additional pads for smaller main filter caps on board (closer to the IC), in case someone wants to use regulation with those chips.
For driving subwoofers, this may be actually the best solution. So Carlos, we all really appreaciate your input, (and hard pioneering work).
For driving subwoofers, this may be actually the best solution. So Carlos, we all really appreaciate your input, (and hard pioneering work).
Peter Daniel said:
Peter, on a private mail to Leon (t.) I advised him how to use the OPA627.
I repeat: I always have excellent results with it.
This is something I won't do for you, I don't care if you don't get a good sound with it, I don't care what you say about the amp.
Have a nice weekend.
Peter Daniel said:
Do you have taken any measures to compensate for the treble roll-off of the NOS dac?
If you like it that way, it's because your amp is too bright.
I'm talking serious.
If you don't have a neutral source you can trust, you better quit this business.
Peter Daniel said:
You are sou stupid that you KNOW that I use the LM3886 and didn't try it.
I passed the LM3875 looooong ago.
I have an amp with LM4780.
You're still in the beginning of all this, follow on...
carlosfm said:
I also built the TDA1543 NOS dac and noticed the treble roll off, its not a bad sounding dac and is cheap and easy to build but I feel my modified Arcam Alpha5+ (NOS,TDA1541S2 ,ALW super regs,Pedja's output stage etc) easily beats it
t. said:
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.
Strawberry jam is so vastly superior to raspberry jam that anyone preferring the latter must be a useless sack of excrement.
carlosfm said:
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?
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? 😉
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? 😉
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
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
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...
al/currently building a (possibly regulated) twin LM3886 for an active Sub...
pinkmouse said:
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
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.
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....😉
Nuuk said:
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
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