Simple ACTIVE I/V for TDA1543 - Page 6 - diyAudio
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Old 4th July 2003, 07:01 PM   #51
dddac is offline dddac  Germany
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Thanks for getting me off moderation.

4 times I posted the pictures. I could see them in the off-line mode, but when my post appeared they were magically gone

Try again:
fft1
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Old 4th July 2003, 07:02 PM   #52
dddac is offline dddac  Germany
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YES IT WORKS !!!


PIC2

FFT2
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Old 4th July 2003, 07:48 PM   #53
Pedja is offline Pedja  Serbia
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Thanks Doede. Really instructive! To be honest, I did not believe that such figure (fft1) can be achieved with 2k or similar I/V resistors.

(I forgot to mention, in the measurement I posted Rref was 1k.)

Pedja
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Old 5th July 2003, 01:51 AM   #54
fedde is offline fedde  Netherlands
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Thanks Peter. Now I can use my crystal ball for more useful purposes!

I don't know if all TDA1543's can be used with high I/V resistors. I've heard that some will clip then...

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Old 5th July 2003, 09:43 AM   #55
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Lightbulb Sziklai input CB-CB connected (folded)

Hi Rudolf,
Here is my attempt. The setting of the pot is a bit tricky as Q5 is a current source in itself drawing also current from Q4.
I hope this works. I have not built or simulated this.
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Old 5th July 2003, 12:58 PM   #56
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Default I/V stage

Hallo!
The schematic below derives directly from the Passlabs D1
I build it balanced and implemented successfully into a sony CD player . In that case the Dacs were looking for a virtual ground.

Now , I'm waiting for parts (TDA 1543, receiver etc) and I have not try it or simulate it .
I wonder if it will work with TDA 1543.

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Old 5th July 2003, 01:00 PM   #57
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Default SCHEMATIC

.
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Old 10th July 2003, 07:52 AM   #58
rbroer is offline rbroer  Netherlands
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Stefanobilliani,

Sure it can work, just change the resistors so, that the gate voltage on Q1 is 2~3V higher compared to the one with virtual ground. This will lift-up the source voltage on Q1, hence the DAC output voltage.
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Old 10th July 2003, 12:51 PM   #59
miguel2 is offline miguel2  Portugal
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Hi,

Would the circuit on page 1 work well with a 4x oversampled signal? My CDM12.1 transport oversamples the signal and I dont want to mess with it.

And what are the circles with arrows inside? It is just to show the current or they are current sources?

Miguel
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Old 10th July 2003, 03:04 PM   #60
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Quote:
Originally posted by rbroer
Stefanobilliani,

Sure it can work, just change the resistors so, that the gate voltage on Q1 is 2~3V higher compared to the one with virtual ground. This will lift-up the source voltage on Q1, hence the DAC output voltage.

Thanks for the reply rbroer,

what about a constant current source (better PSRR), and at what current? After searchin' around in the thread and projects seems that the preferred current for the TDA1543 is around 7-8 mA for I/V ; can anyone confirm this?
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _


Already build 3 massive power supplies , the input receiver...
The TDA still not arrived

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I take the occasion for a question that is pretty interesting for the thread:
the absolute output phase:
I noticed in different projects around the internet that just one case does an exception regarding the pins in the differential input receiver from the SPDIF. The pins are 9 and 10 of the CS8412.
Almost all projects sets the pin 10 (after the cap) at ground , and the pin 9 (after the cap) at the signal.
The TNT-audio CONVERTUS does the opposite: pin 9 at ground and pin 10 at signal.
Does this help to restore the absolute phase at the output of the DAC, since I read at the NONOZ2 DAC page that the TDA1543 inverts the phase?

Thanks
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