Any good TDA1541A DAC kit? - Page 48 - diyAudio
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Old 8th January 2013, 05:22 PM   #471
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Quote:
Originally Posted by qusp View Post
I must admit to still being a bit confused as to why the pinheader is after the ufls, why not before and have the u.fl facing the other direction? particularly if anyone ever populates both, having a big-*** pinheader directly in the way of what is supposed to be at least somewhat impedance controlled signal when it should he easy for that to not be the case, seems odd to me. I presume you have a reasoning for it though?
Yeah, I'm not sure how I'd be able to route better with them facing the other way. If its ok to route under the ufl on the top layer, why turn it around. But I might not be picturing what you have in mind. Can you sketch it out? Truth is they were just there to be there and I was going to use the ufls. Bear in mind there are restrict areas beneath the connectors. I'm certainly open to better ideas, just having trouble picturing it.
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Old 8th January 2013, 06:21 PM   #472
qusp is offline qusp  Australia
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yeah I know the restrict is there, I recommended it to you =)

at the moment the pinheader is dominating performance, if the u.fl is what you will use, you are at the moment lowering its performance by the way its sitting in order to have the pin-header.

just roughed this for description, resistor network was just to have something to connect to. rough as guts but you get the idea

as shown the through-holes are still 2.54 pitch, out of the way and works well I think. didnt check it against your layout both sides, can you make this work?
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File Type: jpg uflandPTHsch.jpg (31.3 KB, 273 views)
File Type: jpg uflandPTH_fill.jpg (41.8 KB, 272 views)
File Type: jpg uflandPTH.jpg (64.7 KB, 272 views)

Last edited by qusp; 8th January 2013 at 06:41 PM.
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Old 8th January 2013, 06:38 PM   #473
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Yes I see now, makes sense. Should be no problem implementing that.

Thanks,
Chris
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Old 8th January 2013, 06:43 PM   #474
qusp is offline qusp  Australia
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noticed I had silly spokes on the ground pads, edited and updated, couldnt have that, even on a rough lol

yeah I couldnt see why not either. no dramas.

you could move the row down closer to the u.fl slightly too, but would probably be a pita to solder the header and if the header is secondary, better like this.

Last edited by qusp; 8th January 2013 at 06:45 PM.
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Old 8th January 2013, 10:18 PM   #475
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Originally Posted by vanofmonks View Post
orse. Not sure why the trace thickness need increasing. They are significantly larger than the signal requires.
From my own experience, the sound from the TDA1541 will be better if you use thicker traces from the output pins. Dont belive me.. do two boards, one with thin and one with thick traces. Tell me which sounds better...
But anyway its your board, do as you wish. I thought you were asking for suggestions.
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Old 9th January 2013, 12:23 AM   #476
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Default Latest

Here is the latest. It was a bit more involved than I thought, but I think it is better now. I increased audio out trace width. It's now as big as practical I think, and my only point was that electrically, the trace was thick, but could be thicker. Here we go.
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Old 9th January 2013, 01:08 AM   #477
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Looking good , hopefully Thorsten can leave some informative tid bits if he has not yet already started his own TDA1541A DIY project as he mentioned a while back in this thread

It would be nice to see a 6DJ8/ECC88/6N23P/6N1P output board as an option to this also
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Old 9th January 2013, 01:12 AM   #478
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Originally Posted by vanofmonks View Post
I increased audio out trace width.
looks good.
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Old 9th January 2013, 01:56 AM   #479
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Default output board

Here is one based on Thorsten's 2005 schematic. The inductors are panasonic with mu metal shields. To save board space, output capacitors are external of the board.
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Old 9th January 2013, 02:26 AM   #480
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have you got a quote for the boards yet?
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