MayDus, PCM2706/CS4398 USB DAC w Transformer output. - diyAudio
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Old 15th April 2012, 10:25 PM   #1
Mayday is offline Mayday  Sweden
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Default MayDus, PCM2706/CS4398 USB DAC w Transformer output.

I've ordered a pcm2706/cs4398 based usb dac pcb.
I went with a tube output on the MayDac(TDA1541A), and with this one I'll use edcor transformers between cs4398 and RCA-out.
I would like to use Jensen or Lundahl, but I can't afford them.
Thanks Dave, for pointing me to the edcor transformers.

I was planning on using 600:600 XSM, but was steared towards 10K:10K by some friends on another forum. Any thoughts?
Do I need the XSM 10K:10K or will a WSM 10K:10k do?
Any difference in SQ between the two?

Edcor XSM 10K:10K
Edcor WSM 10K:10K

DAC
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I'm choosing between this box for it(plastic)
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or one similar to my B1 preamp-build, but smaller.
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The metallbox will be more expensive, plus the plastic one is on it's way.
But will a plastic box do the trick, thinking about grounding etc?
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Old 16th April 2012, 11:23 AM   #2
Mayday is offline Mayday  Sweden
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Has anyone here done a transformer output for CS4398?
Any advice is appreciated
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Old 16th April 2012, 05:57 PM   #3
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I'll order the Edcor XSM 10K/10K and upgrade to a Lundahl LL1540 later if I really like how it sounds.
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Old 18th April 2012, 10:13 AM   #4
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Got the plastic box today, here it is in comparison to my iphone4(in need of cleaning).

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Old 19th April 2012, 10:13 AM   #5
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Two Edcor XSM 10K/10K ordered
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Old 19th April 2012, 12:24 PM   #6
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I've used the XSM 10K/10K as isolation transformers in a soundcard based audio test system and was quite happy with them.

You need to try to keep your load impedance near 10K and they should work well. The 600/600 would not work well in this application as the impedance is too low for the DAC output to drive if the transformer were properly loaded.
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Old 19th April 2012, 12:38 PM   #7
Mayday is offline Mayday  Sweden
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Quote:
Originally Posted by TheGimp View Post
I've used the XSM 10K/10K as isolation transformers in a soundcard based audio test system and was quite happy with them.

You need to try to keep your load impedance near 10K and they should work well. The 600/600 would not work well in this application as the impedance is too low for the DAC output to drive if the transformer were properly loaded.
Thanks
Hope I'll be happy with them as well.
They'll drive a Lehmann BCL clone headphone amplifier. Not really sure what input impedance it has though.
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Old 19th April 2012, 03:21 PM   #8
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Anyone who has a rough estimate about edcor's delivery times to europe?
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Old 19th April 2012, 04:31 PM   #9
Mayday is offline Mayday  Sweden
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I was told about 14 days by another Swede, not too long
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Old 20th April 2012, 09:22 PM   #10
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Just checked edcors site, my xsm's are shipped
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