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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
A story of mysterious interaction between a diy tda1543 dac setup and the human body.
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Old 16th April 2018, 07:56 AM   #61
abraxalito is offline abraxalito  United Kingdom
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The output compliance range of the 1387 is a little bit different (1.5V down from the pos supply vs 1.2V down) and its max supply is only 6V. But otherwise you can interchange them from the point of view of the PNP I/V stage.

The difference in sound is rather like what @xx3stksm says in another DAC thread about the difference between an LT and a BB DAC chip. TDA1387 is clearer, more like hires video and TDA1543 is more soft like a photographic film.
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Old 16th April 2018, 08:11 AM   #62
Bartb is offline Bartb  Slovenia
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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
Quote:
Originally Posted by abraxalito View Post
The output compliance range of the 1387 is a little bit different (1.5V down from the pos supply vs 1.2V down) and its max supply is only 6V. But otherwise you can interchange them from the point of view of the PNP I/V stage.

The difference in sound is rather like what @xx3stksm says in another DAC thread about the difference between an LT and a BB DAC chip. TDA1387 is clearer, more like hires video and TDA1543 is more soft like a photographic film.
Great! will place an order for TDA1387 today. Thanks
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Old 16th April 2018, 08:21 AM   #63
abraxalito is offline abraxalito  United Kingdom
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They're super-cheap on Aliexpress nowadays. Last time I checked I couldn't believe how cheap, including free shipping.

One big advantage of 1387 is its low power, so its well suited to portable DAC-AMPs such as the one I'm building now. I just have to figure out how to squeeze it into its case now....
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Old 16th April 2018, 10:10 AM   #64
Bartb is offline Bartb  Slovenia
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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
Quote:
Originally Posted by abraxalito View Post
They're super-cheap on Aliexpress nowadays. Last time I checked I couldn't believe how cheap, including free shipping.

One big advantage of 1387 is its low power, so its well suited to portable DAC-AMPs such as the one I'm building now. I just have to figure out how to squeeze it into its case now....
Ha ha nice there's some streamlining to do there I guess
Talking about squeezing... here's your circuit on a 26x64mm veroboard..
( still need to add all four transistors; added some caps on power supply )

Will check Aliexpress thanks
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Old 16th April 2018, 07:00 PM   #65
Bartb is offline Bartb  Slovenia
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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
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Originally Posted by abraxalito View Post
I was thinking 4 initially. The aim of the experiment would be to see if the bass improves still further. If the bass is limited by low frequency noise then paralleling should give a reduction in noise. The result of listening to 4 paralleled modules then would give an indication whether its worth trying more...

Already with my lingDAC the bass to my ears sounds better than any other DAC I've heard, but only with a specially low impedance, low noise supply (well under 1ohm Zout).
P.S.
This (crazy) idea came to me that you could maybe try when you complete your 4x parallel project. Have you ever tried mixing the two (compatible) chips? Wonder what it would sound like using 2xTDA1543 and 2xTDA138 together...
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Old 17th April 2018, 03:23 AM   #66
abraxalito is offline abraxalito  United Kingdom
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Nope, the idea had never entered my mind prior to your mention of it. Might be worth a try sometime, so many ideas and so little time...
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Old 18th April 2018, 02:59 PM   #67
Bartb is offline Bartb  Slovenia
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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
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Originally Posted by abraxalito View Post
Nope, the idea had never entered my mind prior to your mention of it. Might be worth a try sometime, so many ideas and so little time...
With reference to you project of paralleling TDA1387s, this might save you some time ? :
"HIFI 8 parallel TDA1387 direct substitution TDA1541",
ebay object #132130954983
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Old 18th April 2018, 03:35 PM   #68
abraxalito is offline abraxalito  United Kingdom
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That board would have paralleled power pins, something I wish to avoid in my experiment.
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Old 22nd April 2018, 08:59 PM   #69
Bartb is offline Bartb  Slovenia
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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
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Originally Posted by abraxalito View Post
You're using the single transistor I/V on TDA1543? In which case yes you need some bias (by a R on pin7) just as before. But you can get better sound by using your own supplied current source rather than using the one internal to the 1543.
Hello !
One side of my previous circuit was popping all the time so I just decided to start again from scratch with fresh components...
Now it's neater
If you have a minute or two...could you kindly show me what you meant by "using your own supplied current source" ?
Thanks
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Old 22nd April 2018, 11:52 PM   #70
percival007 is offline percival007  England
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Originally Posted by Bartb View Post
Ps here's the player if you want a closer look.
Sorry to hijack this thread but I bought one of these from AliExpress. Can't seem to get it to work. What sort of i2S does it O/P? Left Justified? Right Justified?
No Intructions supplied and no Remote like in the picture here. Ah well, it was pretty cheap !!

P.
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