A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 51 - diyAudio
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Old 7th August 2013, 07:16 PM   #501
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I have two transformers CMLI-15/15B2 (double shielded). I want them to join the DDDAC1794. I enclose a drawing chart. Is that okay? I do not need any capacitor at the output?
I have the 15/15b. Just soldered them in. Exactly as per your drawing. Except I only have one shield....I connected the black and white to common. You may add the gray to common as well. Or to the ground output...I really don't think it matters. Please anyone correct me if I'm wrong anyone...anyone? The grey wire should be connected to...anyone? Ferris? Anyone?.

Just letting my Cinemags burn in before I give them a serious listen.
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Old 8th August 2013, 09:38 AM   #502
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Originally Posted by Bas Horneman View Post
I have the 15/15b. Just soldered them in. Exactly as per your drawing. Except I only have one shield....I connected the black and white to common. You may add the gray to common as well. Or to the ground output...I really don't think it matters. Please anyone correct me if I'm wrong anyone...anyone? The grey wire should be connected to...anyone? Ferris? Anyone?.

Just letting my Cinemags burn in before I give them a serious listen.
Hi Bas,
Would you, or anybody else, think the quality or the kind of the 10Kresister on the secondary side of the transformer matters?
Like it does on the I/V of the DAC? (I wired here four handmade resistors like EC does in his 1541thread. Made a difference.)
I wonder...

Ed

Last edited by ed linssen; 8th August 2013 at 09:47 AM.
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Old 8th August 2013, 09:57 AM   #503
PET-240 is offline PET-240  Australia
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If you hear it and like it then it matters......I think it will no doubt flavour the output side of the transformer. I'm waiting and saving to get the dac and for Bas to let us know his findings on the Magnequests or the Cinemags.....
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Old 8th August 2013, 10:06 AM   #504
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Hi, Doede,

I'm wondering whether you've experienced much in the way of shortened PCM1794A chip lifespan? If so, it might be traceable to supplying them with an 8.0 volt Vcc. While the PCM1794A do function at that high a Vcc, I should think that such an continuous over voltage supply condition would accelerate the chip's breakdown mechanisms.
Hi Ken,

what makes you think a higher voltage would lower life span? It is only the analog section which runs at the higher voltage. On other Projects I have had very positive experience running Chips at higher voltage without any Problems. The proof will be in the eating though
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Old 8th August 2013, 10:09 AM   #505
PET-240 is offline PET-240  Australia
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mmmmmmm crunchy DAC chip. The 1543 runs no worries at Doede's voltages so I see no worries with the 1794. Mind I'm still saving for a set......
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Old 8th August 2013, 10:11 AM   #506
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Bas to let us know his findings on the Magnequests or the Cinemags.....
That puts a lot of pressure on me
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Old 8th August 2013, 10:12 AM   #507
PET-240 is offline PET-240  Australia
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Old 8th August 2013, 10:16 AM   #508
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Quote:
Hi Bas,
Would you, or anybody else, think the quality or the kind of the 10Kresister on the secondary side of the transformer matters?
I'm one who believes almost everything matters. But if something sounds as right as Doede's DAC I'm not too bothered about a single resistor here or there. I can't even be bothered about the resistors that come standard with the DAC. Even though there may be better ones. I will try the odd cap and/or transformer though

Last edited by Bas Horneman; 8th August 2013 at 10:19 AM.
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Old 8th August 2013, 10:21 AM   #509
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Thats how coal turns to DIAMONDS!
What if I'm already a diamond? I could crack!
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Old 8th August 2013, 10:26 AM   #510
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You would know if you were, if wouldn't come into it....
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