Any good TDA1541A DAC kit? - Page 45 - diyAudio
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Old 29th December 2012, 12:40 PM   #441
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Yes... Seems so...

Btw following your threads on Nos Filters (which went in the direction of recording quality) and the tda1543 ozone over at WBF.

What is your take on tda1387? I actually believed thia may be the mysterious uda1305at used in the amr cd777. At least its multibit, compared to cc of the tda1305...
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Old 29th December 2012, 12:45 PM   #442
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I like the TDA1387 but it takes about double the power of the TDA1545A so I'll use this one when I need lowest power. I'm using TDA1387 on Ozone because power isn't an issue and its I2S just like TDA1543 so no mods are needed to the digital stuff. I rather suspect that the cd777 uses TDA1545A because its a bit more flexible in programming the bias current and I know Thorsten likes to run it a bit hotter than normal
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Old 29th December 2012, 02:18 PM   #443
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At least we both suspect uda1305 is a little trick (not referring to tda1305)... but rather referring to the "second grade" multibit dacs like 1387/1545/1543 (dont think it is 1543 though)
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Old 29th December 2012, 02:31 PM   #444
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No, its highly unlikely to be 1543, I seem to recall the measurements looked too good for that. Also when the output stage is valve, the designer can afford more glitches because a valve has better HF linearity, hence no major drawback to using CMOS over bipolar I'd have thought. So it would be an extremely odd choice if it were the 1543.
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Old 29th December 2012, 03:51 PM   #445
dacen is offline dacen  Norway
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For those of you that are into TDA1541. This unit Nakamichi DAC101 intended for car audio has an interesting dual TDA1541 S1 single crown in differential mode. They show up on Ebay from time to time. I bought one for $100,- and who knows what a little tweaking and modification can reveal.
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Old 29th December 2012, 04:12 PM   #446
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It could certainly use substantial modification - fancy blowing away a perfectly good DAC by using 5532 I/V
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Old 29th December 2012, 04:17 PM   #447
dacen is offline dacen  Norway
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That is exactly what I mean. Its a very good basis for modification. The first thing I have removed is the DC-DC converter (12v to +-15v)and substituted with a traditional power supply

Last edited by dacen; 29th December 2012 at 04:23 PM.
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Old 1st January 2013, 08:45 PM   #448
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Default My layout

Here is the layout I am working on. It is simpler than the full reclocker that has been suggested. I have a layout with the full reclocker, but am not really happy with it, also, with the reclocker circuits others are working on, I'm not sure it is necessary. Also, the source I would be using for the time being is usb using a 12mhz clock. So this is a simple one incorporating some of the recommendations from this thread. What do you guys think. Any changes that should be made, or is it worth a try.

Thanks
Chris
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Old 2nd January 2013, 06:54 PM   #449
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Default Latest

Latest version with some PS optimizations.
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Old 2nd January 2013, 07:59 PM   #450
qusp is offline qusp  Australia
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you need to modify your u.fl pattern to include a routing keepout area in the middle. also I wouldnt bother with the rear pad, its normally not used. I dont know enough about the TDA1541A to comment otherwise i'm afraid
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