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Old 10th October 2002, 04:20 PM   #1
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Default Tda1545 Tda1543 Tda1541

Hello,

I have a marantz CD4000 and i want to replace my Tda1545 could i do that with a Tda1543 of Tda1541 and what sound better.

Thanks Greetz Maartie

Maartie@freeler.nl
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Old 10th October 2002, 08:09 PM   #2
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No.
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Old 10th October 2002, 09:50 PM   #3
Pedja is offline Pedja  Serbia
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Yes and No.

TDA1545 and TDA1543 are pin compatible, but not replacable. You should change/remove the caps and/or resistors on the Vref pin (7). But this would probably be the waste of time.

Generaly speaking, you could swap it also with TDA1541, but that demands more work. You’ll need new pcb and new supply for DAC, and also new analog stage.

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Old 16th February 2014, 01:54 PM   #4
Eldam is offline Eldam  France
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TDA 1545 is an excelent dac chip with a special good sound in highs...

IMHO, you will have better result to try a light tweaking like a good Panasonic os con sepc or Nichicon FP for the 5V and the ref pin (need a very stable feeding). Some thread in DIYAUDIO talk about that.

Swapping with a TDA 1543 or 1541 is a lake of time because you need to change to much things, and of course work on the buffer stage after the TDA1545.

Just my two cents of course (I tweak manyTDA1543 an 45 CD players)

Last edited by Eldam; 16th February 2014 at 01:59 PM.
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Old 17th February 2014, 01:47 AM   #5
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In my experience, TDA1545 has been trickier to get right than TDA1543, but well worth the extra effort as it sounds more transparent when the implementation is fully optimized. The main reason TDA1543 tends to be preferred amongst DIYers I think is because its more benign in terms of glitching, being a bipolar technology device. A top-notch TDA1545 output stage can't use a bog-standard opamp for I/V because of their dislike of RF. Passive has worked best for me.

I agree Eldam its worth paying attention to the pin7 drive as noise or ripple on this pin isn't strongly rejected - the basic PSRR of the TDA1545 is rather sucky (30dB from memory).
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Old 17th February 2014, 04:36 AM   #6
ishiru is offline ishiru  Indonesia
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TDA1543 use I2S as input while TDA1545 uses EIAJ.there's TDA1543A which use EIAJ but hard to find.

i used 3*TDA1545 and they sounds pretty good combined w/ 12AX7 output.

you might want to tweak the supply such as changing the caps w/ the better one, adds bypass caps, or even change the regulator to something like LT1083 if the original one was 7805. (1083 was variable output.you'd better set the voltage at something like 3V before connecting it to the DAC then adjust to 5V after connected to DAC)
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Old 17th February 2014, 05:04 AM   #7
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LT1083 7.5A regulator are a bit overkill, maybe 1086 more realistic. But i prefer 723 with PNP BJT over 78xx or even 317
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Old 17th February 2014, 05:07 AM   #8
ishiru is offline ishiru  Indonesia
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Quote:
Originally Posted by didiet78 View Post
LT1083 7.5A regulator are a bit overkill, maybe 1086 more realistic. But i prefer 723 with PNP BJT over 78xx or even 317
yes..way too overkill

just an example from me (i got 1083 pretty cheap )

what's the point using BJT on a regulator?..can it helps lowering the ripple?
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Old 17th February 2014, 05:42 AM   #9
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As power supplies for TDA1545A, I've tried a few. TL431 shunt, BJT-assisted TL431 (lower Z-out) and TL431 as Vref feeding an EF. I prefer this last one (the shunts improved a lot with lots of electrolytics on them) but I'm not yet done with PSUs.... A normal 3pin reg feeding a single TDA1545 is going to have highish Zout due to the very low current demand (3mA or so).

+1 for the question about the PNP on the 723. This chip is very low noise, lower than 317 as far as I recall.
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Old 17th February 2014, 05:46 AM   #10
ishiru is offline ishiru  Indonesia
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Quote:
Originally Posted by abraxalito View Post
As power supplies for TDA1545A, I've tried a few. TL431 shunt, BJT-assisted TL431 (lower Z-out) and TL431 as Vref feeding an EF. I prefer this last one (the shunts improved a lot with lots of electrolytics on them) but I'm not yet done with PSUs.... A normal 3pin reg feeding a single TDA1545 is going to have highish Zout due to the very low current demand (3mA or so).
so..the vref and Vdd was separated?..it might be a good idea!.Vref might absorb ripples from the main supply and separating the Vref supply could help!
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