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Old 20th May 2009, 03:13 PM   #511
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Legarem

for power the dac which of the following trafos you will recommend and why

1) http://www.reichelt.de/?;ACTION=3;LA...741e6b516d47ed

2) http://www.reichelt.de/?;ACTION=3;LA...741e6b516d47ed

3) http://www.reichelt.de/?;ACTION=3;LA...741e6b516d47ed
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Old 20th May 2009, 04:41 PM   #512
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Samoloko

I am not Legarem, but I can answer your question: they are all to small.

Use as minimum an 24VA, better a 30VA or bigger version.

While I am not an engineer and I have very big ears (they seem to physically grow while aging, but the roll off is at 13kHz today), I just attached an EI tranny to the DAC and I also have the impression of softer sound.

Franz
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Old 20th May 2009, 04:56 PM   #513
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BTW:

Because of all this tests and comparisons on my side, I got aware, that I have not enough bass in my nearfield setup (Fostex FE83E in the recommended enclosure).

Actually I plan to build an active crossover and refurbish a bridged LM3886 amp, to drive a subwoofer speaker.

And I will convert my desk to a big open baffle:

Just attach a big panel on the backside of the desk, between the legs. And another two panels sidewards of the desk.

In the backwall I will install a nice 10" driver. And move the desk a little bit away from the wall.

Next four days: holidays

Franz
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Old 20th May 2009, 06:00 PM   #514
johnm is offline johnm  United Kingdom
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Quote:
Originally posted by Franz Gysi
Yes, John, 10R resistors.

But why don't you try yourself different values?

Franz

Hi Franz.

I would but for two reasons:

1) I don't have (well not yet...) the appropriate test gear to see if a change I am making to the sound is actually a GOOD change, or just one that initially sounds good, but is in fact resulting in the DAC/tranny not working as well as it should - hope that makes sense.

2) I am suffering from an illness which means I do not get as much time to experiement as I'd wish. I just want to build something that I know works well and spend more time listening to the music, at least until I am on the road to recovery

I am going to try the 10R resistors this weekend however, and will report back.

- John
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Old 20th May 2009, 08:33 PM   #515
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Quote:
Originally posted by legarem
Try a EI standard transformer (big 9 volts 2A) to replace the toroidal and give me some news. You'll be surprized by the results.

Quote:
Originally posted by Franz Gysi
I just attached an EI tranny to the DAC and I also have the impression of softer sound.

Based on that, how could I resist. I just ordered one. I hope 50VA is enough.

Will the 6V-8V input of the DAC be happy with 9V, or do I need a resistor?
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Old 20th May 2009, 11:48 PM   #516
legarem is offline legarem  Canada
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Quote:
Originally posted by hoverdonkey


Will the 6V-8V input of the DAC be happy with 9V, or do I need a resistor?

It should be a great transformer

No resistor needed
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Old 20th May 2009, 11:54 PM   #517
legarem is offline legarem  Canada
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Quote:
Originally posted by Franz Gysi
I just attached an EI tranny to the DAC and I also have the impression of softer sound.

Franz [/B]

Franz

Is it broken in ?
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Old 21st May 2009, 06:46 AM   #518
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Marc

Yes, it is burned in

Why I believe in burning in audio trannies?

Because the magnetic parts have some hysteresis.

This means, the actual state is depending from a predecessing status.

We could it also describe as following: the history of the magnetic state does influence the actual state.

Thats why I can accept, audio transformers are depending on the magnetic history and this can influence the actual performance.

For MUSIC! Fast bursts, a wild mix of waves of different frequencies.

But for mains transformers, situated in front of regulators and driving mostly digital equipment?

How would you explain to me the influence of the burning in process for a 50Hz sine?

Kind regards
Franz
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Old 21st May 2009, 06:51 AM   #519
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Quote:
1) I don't have (well not yet...) the appropriate test gear to see if a change I am making to the sound is actually a GOOD change, or just one that initially sounds good, but is in fact resulting in the DAC/tranny not working as well as it should - hope that makes sense.

2) I am suffering from an illness which means I do not get as much time to experiement as I'd wish. I just want to build something that I know works well and spend more time listening to the music, at least until I am on the road to recovery

I am going to try the 10R resistors this weekend however, and will report back.
John

1) You do have the test equipment: your ears! Everything between zero Ohms and 50 Ohms (in conjunction with the Digitec's) is working well. The difference is depending on your taste and your reproduction chain.

2) I wish you fast recovery!

Franz
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Old 21st May 2009, 11:35 AM   #520
legarem is offline legarem  Canada
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Quote:
Originally posted by Franz Gysi
Marc

Yes, it is burned in

How would you explain to me the influence of the burning in process for a 50Hz sine?

Kind regards
Franz
I was joking with my statement.

I don't think that power transformers needs to be broken in.
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