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Old 20th October 2012, 07:41 AM   #18601
UV101 is offline UV101  England
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Yep, I tend to twist or braid. I've also run low voltage ac across the front previously without issue
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Old 20th October 2012, 07:52 AM   #18602
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Cool, thanks guys. I'll run twisted 9v pairs along the front then. Anyone have any opinion on whether 3.5va winding is enough for the DAC digital supply?

I finally got a tiny 3.2va toroid in for the display last weekend, allowing me to remove the KI transformer. It doesn't half run hot though!
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Old 20th October 2012, 08:14 AM   #18603
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Originally Posted by badrisuper View Post
Problem fixed. Thanks UV101. Given picture helped me. Very audible difference I am hearing after removing these components.

Thanks
Badri
This method of direct coupling the output works here because there is 0v DC offset after the 2nd Opamp stage.

You should always check with a meter set to the mV range before you direct couple. DC into your amp could damage the amp and speakers!!!
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Old 20th October 2012, 02:10 PM   #18604
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This morning I managed to fit the four transformers at the rear side of the CD63. See the attached photo. I will connect the wires to the PCB when I have the time. The square encapsulated Tx in blue is for the low jitter clock.

I placed the three toroidal Tx on top of an universal PCB which I hope will make my soldering much more easy when connections are made.
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Old 20th October 2012, 02:16 PM   #18605
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Originally Posted by Ben Hanke View Post
Cool, thanks guys. I'll run twisted 9v pairs along the front then. Anyone have any opinion on whether 3.5va winding is enough for the DAC digital supply?

I finally got a tiny 3.2va toroid in for the display last weekend, allowing me to remove the KI transformer. It doesn't half run hot though!
I think it should be sufficient as the power drawn by the DAC would not be too much. You should have about 400-500mA supply of current having taking into account of the Tx efficiency.
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Old 20th October 2012, 02:29 PM   #18606
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Obviously it will work but I think Brent used 7.5va 9v for digital and and the same for analogue. We already know that within reason, bigger transformers bring sonic benefits.

Given the almost identical cost of the TX, I know what I'd be doing!!!!
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Old 20th October 2012, 02:50 PM   #18607
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Originally Posted by UV101 View Post
Obviously it will work but I think Brent used 7.5va 9v for digital and and the same for analogue. We already know that within reason, bigger transformers bring sonic benefits.

Given the almost identical cost of the TX, I know what I'd be doing!!!!
Agreed, the bigger the Tx the more stable the voltage and thus better. I think Ben has space constraints so he tries to use a smaller Tx
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Old 20th October 2012, 02:56 PM   #18608
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Thanks higlander. Separate chip supplies were a big win for me, as was separate transformers for output, servo/5v and display, but I picked up a very low level 60Hz hum at some point that I can't seem to track down. It's not audible at listening levels - only in stop mode with amp volume past 12 o'clock (speaker blowing time) - but I'm concerned that I might make it worse.
Re. the humming issue. Did you connect the CD63 to the main's earth. When I connect the CDP to the mains earth I also got small humming noise but when I disconnect it the noise has gone. The CD63 was designed without the need for any earthing to the mains. Earthing the CDP will create earth loop
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Old 20th October 2012, 03:15 PM   #18609
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@higlander - No, I didn't connect the earth. I can hear the transformer(s) when I put my ear to the case as well. It's not really a big problem - it just bugs me that I know it's there. If I still had muting transistors I wouldn't even know about it.

@Ian - thanks, maybe I'll devote a whole one of these 7VA toroids to the DAC digital then. I bought 5 total. I can probably find a way to squeeze more in.
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Old 20th October 2012, 03:36 PM   #18610
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I can hear the transformer(s) when I put my ear to the case as well. It's not really a big problem - it just bugs me that I know it's there. If I still had muting transistors I wouldn't even know about it.
If the humming is from the Tx itself it means that the Tx is loosely fitted. Try clamping it tight by bolts to the case.
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