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TDA1541A non-o/s DAC PCB

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#201
Again on the output buffer

Pedja said:


Yes. It boils down to that the marked three pads should be electrically connected, i.e. upper left should be connected to one of two others.


An externally hosted image should be here but it was not working when we last tested it.


May be done that way, and also just moving C122/125 this way.

An externally hosted image should be here but it was not working when we last tested it.


Pedja
Click to expand...

Sorry, I still have some truoble with the output buffer connections.
If R105 is removed, what remains attached to AD844 pin 6?

Carlo
 
#202
Re: Again on the output buffer

cjunk said:


Sorry, I still have some truoble with the output buffer connections.
If R105 is removed, what remains attached to AD844 pin 6?

Carlo
Click to expand...

Pin6 is left disconnected which is the AD844 buffer out(chips internal buffer) , if you use the discrete buffer then its not needed🙂
 
#204
Re: Parts Selection WIKI

jonclancy said:
I have got a parts-selection WIKI up. I hope there will be some recommendations made on parts brands to help newbies like me.

I put it here: http://www.diyaudio.com/wiki/index.php?page=Parts+selction
Click to expand...

Hi Jon,
I added a few parts to the Wiki but it gets pretty tedious typing in all this stuff. I hope others will add to it as well.

By the way, for those following this thread, I changed out the TDA1541 I had been using for a selected TDA1541A and the sound got much, much better. Soundstage really opened up. Then today I shielded the TDA1541a and CS8414 chips with copper foils tape and the sound took another step forward. Its sounding really good.
Still haven't swapped out the IEC filter - that will have to wait until the weekend.

---Gary
 
#208
Time for a bump.

Gotten through about 60% of my build, still waiting on THLAudio parts (they appear to be either really slow or never got my e-mail -- anyone have experience with them?). Either way, the part that I have most complete is the output buffer, which I have basically black-gated out with a couple Caddocks for the 1.5kohm resistors just before.

So anyone have recommendations for the four output resistors in each channel? I tried Holcos but they were a bit wide for the purpose, and I'm thinking about getting something better. The 2SK170s are on their way, and then that part will be done.

Anyone try out the DAC using the I2S setup? This is what I exclusively plan on using this DAC for (with the CD-Pro2). Haven't figured out how to properly wire I2S anyways, but I'll figure it out (that or ask here). ^_^

edit: ah, wanted to add a shot of the output buffer...
 

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#214
Peter Daniel said:
I have a bunch of 2.2u/250 Wimas MKS, but they are pretty big: 1.2 x 0.65" footprint.
Click to expand...

Cheers Pete but yes, they are too big, I also have a couple of the 250v ones but not the lower voltage types.
I do have Evox SMR (PPS) which will fit but I'm not sure if this type of capacitor is suitable here
 
#216
Peter Daniel said:
Did you get already those NX BGs for bypasses?
Click to expand...

Not yet although I'll need to be quick won't I😉
I'm still not sure if I should go for 0.1uf or 0.47uf in Pedja's dac.
Pete, Did you say you used 4.7uf N types for the msbs pins in your parallel TDA1541 dac? I guess they could be better than the Wima's
 
#217
The reason I asked, is because I switched from 0.47 BG NX to ERO MKT ( 0.68u). After longer listening I think I prefer ERO. The BGs seemed to have nice midrange and all, but somehow lacked focus and made things a bit disorganized, if you know what I mean 😉

I'm still using 4.7u BG N in the other places.

Another thing with BG is that they won't disappear that quickly. Both Percy and Partsconnexion will keep 2 years supply in stock.
 
#218
Peter Daniel said:
The reason I asked, is because I switched from 0.47 BG NX to ERO MKS ( 0.68u). After longer listening I think I prefer ERO. The BGs seemed to have nice midrange and all, but somehow lacked focus and made things a bit disorganized, if you know what I mean 😉

I'm still using 4.7u BG N in the other places.

Another thing with BG is that they won't disappear that quickly. Both Percy and Partsconnexion will keep 2 years supply in stock.
Click to expand...

I know exactly what you mean and Thank you for sharing your findings pete🙂
When I built the parallel dac using 6c45pi tubes I first used some grey mks (R60 I think) 0.33uf for the 12 x lsb and 2x 0.68uf grey mks for the msbs (for each dac chip)
I then tried changing all 28 caps to some small 1uf 63v wima mks
ones, this also did not sound focused etc even after about a week of burn in, these caps seem to have a big influence on the sound, I don't know if its the values or the actual type of capacitor or maybe both 😕
This is the main reason I wanted to first go with the type and value same as what Pedja used to give me something to start with
 
#219
Strohmie said:
Either way, the part that I have most complete is the output buffer, which I have basically black-gated out with a couple Caddocks for the 1.5kohm resistors just before.
Click to expand...
I like the way those Caddocks look… if the board can resemble the town architecture, those can be the billboards.

While the thread is up… In a few days I’ll upload the info about the reclocker. I don’t have any doubts about its usefulness and I’d definitely recommend it highly with this DAC. It is a pity that Mr. Kwak lost his interest for this thing since his overtone clock was IMO the best source to drive flip-flops.

Pedja
 
#220
Pedja said:

I like the way those Caddocks look… if the board can resemble the town architecture, those can be the billboards.

While the thread is up… In a few days I’ll upload the info about the reclocker. I don’t have any doubts about its usefulness and I’d definitely recommend it highly with this DAC. It is a pity that Mr. Kwak lost his interest for this thing since his overtone clock was IMO the best source to drive flip-flops.

Pedja
Click to expand...

Great stuff Pedja, we'll look forward to the reclocker.
Should be interesting comparing the 1k5 Rikens against those billboards😉
Come on guys, this thread should be more active!
 
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