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Old 8th March 2013, 04:16 PM   #1
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Default discrete output for single tda1543

hi i wanna make a simple output stage for a single 1543 using audiogd's opa earth discrete module. any suggestions? thx
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Old 10th March 2013, 06:41 AM   #2
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allow me to rephrase myself- is the 1543 datasheet output a sensible enough design to follow?
im wanting an all in one solution where i can have an active out that can double as a headphone amp in my bedroom
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Old 10th March 2013, 08:03 AM   #3
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You must have a current to voltage converter. Why don't you check the datasheet of the TDA1543 and choose a good opamp? The audiogd's opa earth would't be my first choice. I would choose a new ultra high performance opamp.
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Old 15th March 2013, 12:06 AM   #4
Eldam is offline Eldam  France
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Hi PreSapian,

Why not use the easy to do 1543's output design of John - ECdesigns -
Just few component (no dc coupling cap, no opa...) cheaper than benchmark many expensive opa, discretes and shunts to powersupply them. (keep them for an another project).
You have the opportunity with the 1543 to do without all these things if you want.
Search in his famous ultimate thread, there is a shematic.
cheers
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Old 8th May 2013, 05:25 PM   #5
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i'm having a bit of fun with 1543 iterations now a days.

i built an overkill version of cmoy with opa-earth for the buffer/headphone amp of my 1543 and though it does take away the nuisance, the dynamic does benefit a lot for the single chip board.

of which, i'm powering with a nicad battery. i also have a couple of 10 chip boards made- one is 317 regulated, the other teddyreg.
teddyreg does sound more refined but the bass is less.

i did also try john's passive output but scapped it after realizing it took away too much of finer detail- i guess less is more is especially applicable to tda1543 implementations.

i'm now itching to try differential output version and a shunt regulator.
am thinking of piecing together a zener regulator this week just to see if it will have any positive attributes.
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Old 8th May 2013, 06:47 PM   #6
Eldam is offline Eldam  France
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Hi presapian,

I had a good result with the TDA1543 with this :

tda1543 with just an OS-CON SP 220 uf (not 1uf in // with mkt, etc) for I/V,

then an old JRC OP that works well here: NJM 4580D(x), the caps are very important here : old nichicon Vx 100 uf that you find in old philips CD players, I don't know why better caps doesn't work better here,

then a passive low pass filter façon Marantz in their old players, then

then 2 OPA GD Sun with 2 Silmic 100 uf by OP for the two rails on it, you can use shunt here if you want,

then DC blockers, i use old nichicon bipolar muse that better than the newer::: the older of the 90s' are very better, you can use too 10 uf KP, PP, lundhal if you have it, but muses are enough with this low budget conf,

to me it dramaticaly sings if you respect the choosen caps... better than a Luxman 105 d with tubes I found in public garbadge 2 weeks ago...

I prefer most of the time a black Nichicon Z muse caps for power than silmic 2.

It's just the 50 cents classical humble empirical opinion of my hears,
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Old 8th May 2013, 09:18 PM   #7
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thanks Eldam, sounds like a worthy mod to try.

surprising that you liked os-con for decoupling- many have experienced (me including) that they sound harsh in analogue path. perhaps that's not an issue in this location.

have you ever tried mundorf mlytic for that location? 100uf bypassed with a russian pio 0.1uf gave me the most pleasant sound out of all the other config i tried- 220uf bg std, 100uf silmic1 (and 2)+ mundorf supreme 0.1uf, and even a jantzen crosscap 47uf. mlytic is also the biggest electrolytic cap i've seen. i could only acquire the raw version but plain is suppose to be even bigger and better performing.

ultimately i want to try a tube output but i want to fiddle with power supply some more to determine if 1543 can be made good enough. but i suppose a dc coupled 1543 with a minimal trace length to a tube pre serves the same goal.
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Old 9th May 2013, 09:54 AM   #8
Eldam is offline Eldam  France
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Hi Presapian,

In fact I just talk about OS Con for the local decoupling cap of the TDA1543.
The same for the others caps I talked about:local decoupling. I don't talk of the main powersupply of these stages which win (of course) to be separate.
Note that I talk about an empirical & particular configuration for the TDA 1543.
So the old blue VX nichicon caps serie for the I/V is just for the JRC NJM4580D(x) (which was used for head speakers...) and the Silmic 2 for the OPA GD Sun (which is ok at 12 V, Burson for example need 15 to 16 V for singing).

if I talk about "most of the time situation" : I'm agree with you for Silmic (1) which softness can save sometimes too. I heard that silmic was a special ask of Marantz to Elna for the bypassing of their CD players outputstages... Don t know if it's true or not.
I don't like ol black gates, even BG NX (in digital) that a experienced engineer like Jean-Paul (for example) likes (and I think he tried a lot because he gives a lot of time...to time for trying many confs). But agree with him when he prefers Nichicon Z muse to silmic 2...most of time.

I don't benchmark new OS-CON technologie with their famous old one (out of production) because both are hard to genuine source. I saw that Thorsten seems to use the old one in his last AMR Cd player (the velvet caps on the motherboard (not the blue ones easier to source...). But I will try the last Nichicon polymere caps whic have the lowest ESR for digital but I surmise that the ESR is not the single fact of the good result of os-con in digital stage (maybe snake oil?).

I will try M-lytic like you already wrote to me for power stages, they are easy to source cause made by our neighbours friends of Germany.

About tubes: I surmise that it's easier to have good result because their use is well known and documented but I think it's possible to live without them... I will be happy to change my mind if I am wrong here, no problem.

I want to play with analog Low pass filters, in fact I ask myself if it's the only way to seriously tune a digital stage to make it sings ????

Happy you give us your results and you play with this little TDA1543 chips.
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Old 11th May 2013, 11:27 AM   #9
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Click the image to open in full size.current state of things- single
battery 1543, jantzen crosscap 47uf decoupling, ohmite resistors and i2s from simple lm317 regulated waveio. yesterday i matched it with a b1 buffer
i put together overnight and the sound is sublime. with b1 the lost bass is back along with greater drive, clarity. i was looking into trying out 20x1543 but instead rather would go full battery power on b1. 1543 is fun but b1
is simply amazing!
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Old 11th May 2013, 06:30 PM   #10
Eldam is offline Eldam  France
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After the B1 you can maybe use the CEN or SEN... known to be good but I never heard it;

Before the B1 which cap did you use with the John's TDA1543 output stage ? Use here may be two smd 1uf Cornel Dublier used by John with the big 470 uf Silmic 2 for the lost details you talked about... tell me please. May be the layout ? I say 2x1uF because I read somewhere that the theory is 5 to 10% of the main value to avoid resonance...but I'm not a technician, check it before but you have to try. I use the empirical method!

I have sometimes this problem with Silmic2 : awsome bass but lack of details in relation to a nichicon Z muse cap!!!!! oups the M-lytic...I forget !

I see you are at the beginning of a great quest with the TDA1543: I don't know if you read that ( you can apply most of the advise of the TDA1541 to the 1543 ):
http://www.diyaudio.com/forums/digital-line-level/203511-any-good-tda1541a-dac-kit-4.html

Last edited by Eldam; 11th May 2013 at 06:33 PM.
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