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Old 27th May 2009, 07:26 PM   #591
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Many thanks guys.

I will give the tranny another audition at the weekend (I am away from my DAC for two days !)
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Old 27th May 2009, 09:33 PM   #592
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Jean-Charles, It' a little off topic but how are you getting along with the Buffalo? I was considering it til I saw the price, kinda steep for a DIY project.

Best, Bill
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Old 28th May 2009, 02:48 AM   #593
legarem is offline legarem  Canada
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Quote:
Originally posted by McGyver



Yes!

You're right. Sorry, I wrote that before taking coffee in this rainy morning.

The transformer I use has 10.5 vac and I never had any problems. The heatsink regulatore doesn't get too hot.
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Old 28th May 2009, 06:30 AM   #594
adamus is offline adamus  United Kingdom
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my sowters arrived....

reading through the thread there is much debate over resistor and cap values for the filter.

Where would be a good place to start?
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Old 28th May 2009, 09:56 AM   #595
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The Jensen values are a good place to start, post #349. A scope would let you see what's going on but it's not a necessity.
Two 250 ohm Rs and .002 cap on primary, 1K with .001 cap on secondary. Anything close will give you a good starting point.

Best, Bill
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Old 28th May 2009, 10:37 AM   #596
McGyver is offline McGyver  Poland
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Quote:
Originally posted by legarem



You're right. Sorry, I wrote that before taking coffee in this rainy morning.

The transformer I use has 10.5 vac and I never had any problems. The heatsink regulatore doesn't get too hot.

Rainy or sunny, whatever, I don't function properly before taking morning coffee

I ordered some 600/600 transformers with center taps for further experiments. I'm going to try to attach it to TDA1547 DAC to provide I/V conversion and desimetrization.
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Old 28th May 2009, 01:31 PM   #597
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Quote:
Originally posted by hoverdonkey
From your reactions, I guess that 10.6V is too much.

Is it a bad transformer, or does it just need more load (maybe resistor in series)? Its specification allows 8% tolerance, but 10.6V is +18%.

Thanks
I have looked at the photos of the DAC. It is fully regulated.
I would not touch anything since the regulators will take care of the extra voltage.
I am not worried about the additionnal dissipation either because it has been reported here that heat is not excessive.
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Old 28th May 2009, 01:52 PM   #598
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Quote:
Originally posted by Bill Fuss
Jean-Charles, It' a little off topic but how are you getting along with the Buffalo? I was considering it til I saw the price, kinda steep for a DIY project.

Best, Bill

Hi Bill,
I will be happy to report to you here or privately.
It is now all assembled and tested, but I did not listen to it yet.
I wanted a case for it and add a few upgrades before I start compairing with my present set up.
The price is up a little because they have introduced a new chip.
My Buffalo is based on the ESS9008, but now, they are the first to use the ESS9018. This is a 32 bit baby.
Also the IVY is built in on the DAC board. I have a separate IVY board with my older version. This could be an advantage since I can test any other output set up with the Buffalo, including transformers.
Russ White is presentely designing a new tweaker's board containing only the DAC, where the IVY will be excluded.
This leaves us the freedom to add an external IVY, or a Conterpoint, transformers or anything we can dream of.
I will come back to you soon.
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Old 29th May 2009, 12:18 AM   #599
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[QUOTE]Originall posted by Mcgyver:
According to my observations if the solid state amp has low input impedance, the sound of our DAC with trafos alone sometimes becomes "dead". So I'm soldering Version with cathode followers after trafos. There is a picture of my test setup built into CD player. There is mini SMD version of our DAC:M[QUOTE]

Mcgyver in the end how did your test's go with Solid state amp, did you find the sound better with Transformer, or tube or even opamp.
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Old 29th May 2009, 12:28 AM   #600
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Default Re: work in progress

Quote:
Originally posted by McGyver


According to my observations if the solid state amp has low input impedance, the sound of our DAC with trafos alone sometimes becomes "dead". So I'm soldering Version with cathode followers after trafos. There is a picture of my test setup built into CD player. There is mini SMD version of our DAC:

Mcgyver in the end how did your test's go with Solid state amp, did you find the sound better with Transformer, or tube or even opamp.
I'm still deciding if this is the fix for me.:confused
I apologize for the same 2 reply's but I'm having problems with the quote options
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