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RJM Audio Emerald Phono Stage Help Desk
RJM Audio Emerald Phono Stage Help Desk
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Old 3rd May 2019, 09:02 PM   #11
cal16v is offline cal16v  Australia
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Reading on with interest as I wait for my boards to arrive...
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Old 7th May 2019, 11:39 PM   #12
cal16v is offline cal16v  Australia
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My Emerald boards have arrived and I'm very impressed. Overall my kit has all the required documentation, quality parts and fantastic looking pcb boards. Can't wait to get started now.
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Old 8th May 2019, 12:11 AM   #13
WntrMute2 is offline WntrMute2  United States
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Quote:
Originally Posted by cal16v View Post
My Emerald boards have arrived and I'm very impressed. Overall my kit has all the required documentation, quality parts and fantastic looking pcb boards. Can't wait to get started now.
Following with interest!
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Old 15th May 2019, 04:06 AM   #14
DRONE7 is offline DRONE7  New Zealand
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I have a few transformers in the spares box... conventional single-wound output, 24v centre tapped.(12v/side)

Presumably these will suffice using a single bridge. ?

Or is the double winding and twin bridges shown on the build page needed for some reason ? and if so why so ?
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Old 15th May 2019, 04:50 AM   #15
rjm is offline rjm  Japan
Richard Murdey
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RJM Audio Emerald Phono Stage Help Desk
You can use a 24vct if you want. You'd use one bridge rectifier, in the conventional way, to get the positive and negative rails. The center tap connects to COM.
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Old 15th May 2019, 05:40 AM   #16
DRONE7 is offline DRONE7  New Zealand
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Thanks for the prompt reply !
What's the advantage of using twin outputs and bridges ?

Getting organised here in anticipation of a build....(boards ordered...Bob)
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Old 15th May 2019, 05:47 AM   #17
rjm is offline rjm  Japan
Richard Murdey
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RJM Audio Emerald Phono Stage Help Desk
If you have dual secondaries, then using two bridges makes the connection more foolproof since the phase of the output winding isn't a concern.
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Old 15th May 2019, 05:52 AM   #18
DRONE7 is offline DRONE7  New Zealand
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Great thanks !
makes life easier... working through the BOM to see what I have on hand...and what I have to order....

Looking forward to this project...
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Old 15th May 2019, 11:27 AM   #19
cal16v is offline cal16v  Australia
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I have made a start assembling the boards. Still some parts left to solder...
I'm happy with the layout of the boards inside the aluminium case as well.

A question...
I am housing the transformer in a separate aluminium case connected by an umbilical. It was suggested in the VSPS thread to twist the power wires, so is this only for the mains wiring to transformer or does it also apply to the wiring from the plug shown to the phono boards?

Thanks
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Old 16th May 2019, 12:00 PM   #20
rjm is offline rjm  Japan
Richard Murdey
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RJM Audio Emerald Phono Stage Help Desk
Both, or rather everything. I usually braid the power (V++,V--,COM) together, and twist the signal wiring (IN+,IN-) and (OUT+/OUT-) pairs. AC wiring (live, neutral) are twisted together, earth is separate. Individual secondary outputs twisted together.

See this post for examples. Comment about case size applies here too, but yours is just that little bit larger and more accessible, so you should be ok I think.
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Last edited by rjm; 16th May 2019 at 12:04 PM.
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