Sowter transformer 8347 I/V stage fot TDA1543 - diyAudio
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Old 27th February 2007, 09:16 AM   #1
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Default Sowter transformer 8347 I/V stage fot TDA1543

Hello all.

I've built a DAC based on a CS8412 and a tower of TDA1545 (8).

I was planning to put a transformer I/V stage with a Sowter 8347.

All is working when I put just one transformer on one of the TDA1545 output but no sound when I put the two transformer on the two channels !

Is somebody have tried this before ?

I think that Audionote have made the same thing.

Kind regards
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Old 28th February 2007, 05:20 PM   #2
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May I ask what caused you to go for this kind of design ??

-Andy-
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Old 28th February 2007, 08:34 PM   #3
Cobra2 is offline Cobra2  Norway
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Did you mean to say: "Since AN did not manage to get good sound this way, why do you want to do the same mistake?"


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Old 1st March 2007, 10:05 PM   #4
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Change R7 and R8 to 2k2.
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Old 2nd March 2007, 06:38 AM   #5
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Thorsten Loesch used Audionote's idea here:
http://www.fortunecity.com/rivendell...io/Adagio.html
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Old 6th March 2007, 11:18 AM   #6
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Thank you for your replies all.

The thing I do not understand is that when I just connect one channel output of the TDA1543, all is working. Tight bass, clear high, really sound great ! But, with the two channels output connected (so the two transformer connected at tht two TDA output) no sound at all ! Just noise ...
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Old 6th March 2007, 11:38 AM   #7
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The Sowter site says you should use a 25Ohm I/V resistor. Mu metal trafos are very sensitive to DC, which should explain the noise. But it doesn't explain why it works when only one channel is connected.
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Old 6th March 2007, 11:48 AM   #8
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hi,

let me share a little bit opinin. My new full balance dac will use.

1.transformers IV.
2.Op-amp>>>>> transformers output.
3. OP-amp>>> 5687 cathode follower>>> caps OUTPUT.
4. Op-amp>>>>5687 cathode follower>>> transformers output.

this is the first op-amp link with transformer output.
pls see the photo show with the connection method between OP & transformer.

Transformers that I use was 1+1:1+1 10ma Max

thx

thomas

Click the image to open in full size.
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Old 6th March 2007, 04:58 PM   #9
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That's true PHN. This doesn't explain at all why this really good work with just one channel.

I have seen too at th Sowter website that I could use a 25 ohm resistor, but what about TDA1543 ?

I have seen too at Sowter that this transformer has been designed for output with a DC component (current or voltage), so I am correct by connecting these transformers without a DC blocking cap ?

I have tried with one and all is working ! All two channels but there is a terrible lack of bass !...

Is Sowter making bad transformers that doesn't support DC offset ?
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Old 6th March 2007, 05:07 PM   #10
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hi elec-tron2,

sorry to distrub U,



Quote:
That's true PHN. This doesn't explain at all why this really good work with just one channel.

I have seen too at th Sowter website that I could use a 25 ohm resistor, but what about TDA1543 ?

I have seen too at Sowter that this transformer has been designed for output with a DC component (current or voltage), so I am correct by connecting these transformers without a DC blocking cap ?

I have tried with one and all is working ! All two channels but there is a terrible lack of bass !...

Is Sowter making bad transformers that doesn't support DC offset ?

U said lack of bass was talk sowter or my connect?

pls make sure sowter can run dc. Otherwise the core will saturate. I also test 8347f, if pass current looks not good. In my design & est. although I use 1+1:1+1, but this is not a Push Pull ytans. It is a SE trans, can pass Dc. so change Resistors on the pri & sec can adj te sound.


thx

thomas
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