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Old 27th June 2003, 03:30 PM   #11
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which wires should i twist?

a. +v and ground
b. -v and ground
c. +v and -v
d. signal and ground
e. output and ground
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Old 27th June 2003, 04:00 PM   #12
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Quote:
Originally posted by Matttcattt
which wires should i twist?

a. +v and ground
b. -v and ground
c. +v and -v
d. signal and ground
e. output and ground



Matttcattt,

1. Twist the 3 psu wires.
2. Twist signal and ground.
3. Twist output and ground.

Clear?
Let's all Twist together!
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Old 27th June 2003, 04:33 PM   #13
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Lightbulb How about Shielded Coax?

Something I read in Kevin O'Connor's book "The Ultimate Tone" might be applicable here...

In his discussion of the wires supplying heater filaments for tubes, he suggests twisting the wires together very tightly to reduce stray 60Hz hum from getting into signal wires, but he then suggests an even better solution would be to use shielded coaxial cable for power runs. You would connect the shield to chassis ground, connecting the twisted pair as you would normally do.
Belden makes a several different twisted pair coax cables with a seperate shield/ground that would fill the bill nicely. It might be overkill, but I've always believed that overengineered projects are better than underengineered ones. As Peter Daniel has said, it's all in the listening, though. So, I may be wrong.

Cheers.
-Erik.
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Old 27th June 2003, 04:40 PM   #14
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Talking talking about overkill...

Supra LoRad.
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Old 28th June 2003, 12:40 PM   #15
Jennice is offline Jennice  Denmark
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Nuuk,

You're welcome to use my description ;-)


MatttCattt:
I surely hope your signal wires are the "normal" coaxial (shielded) signal cables.
In that case there's no twisting to so there. (signal cable as in signal from input terminal to PCB).

In your PSU, twist the wires from the transformer to each rectifier bridge, and the wires from the bridge to the capacitors.

The wires from the capacitors to your PCB / output stage can be twisted (together with the ground conductor which would most likely be going to your bridge rectifiers as well). This length would then include 3 wires twisting along (V+, V- and GND).

Some of the PSU wires can be done in the "stiff" conductor used in fixed household installations. They're flexible enough to twist, but stiff enough to remain together and make a nice routing inside your amp.

No, they're not Oxygen Free Copper, No they don't have a fancy name on them,
No, they are never mentioned in any High end reviews,
But they make the world turn, and should be fine for the PSU purpose.

Happy twisting
Jens
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Old 28th June 2003, 04:25 PM   #16
Nuuk is offline Nuuk  United Kingdom
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Quote:
You're welcome to use my description ;-)
Thanks Jens. I'll try and collect enough similar topics together. Perhaps one day, we will have a difinitive collection of DIY hi-fi topics in one place! A sort of online bible.
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Old 29th June 2003, 05:17 AM   #17
Jennice is offline Jennice  Denmark
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Hi Nuuk,

I dropped by dB dungeon, and it looks interesting.

I've thought about setting up something similar, but never found the time and suitable online space for it.

I also have my own oppinions about cable quality - whether or not there's more to it than L, C and R (which I claim there is not; not to a level of relevance that is).
However, I'd be stoned to death by most of the people in the debate thread about this subject...

Feel free to email me at

jens@sylvestREMOVE_THIS.net

to discuss articles for your site.


Regards,
Jens
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Old 29th June 2003, 08:19 AM   #18
Nuuk is offline Nuuk  United Kingdom
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Quote:
Feel free to email me at
Hi Jens, I just tried to email you but that address was rejected by the server for some reason.
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Old 29th June 2003, 03:25 PM   #19
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thanks for the explination.
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Old 29th June 2003, 04:00 PM   #20
Jennice is offline Jennice  Denmark
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Nuuk,

If I've done it right, you should now be able to email me via the diyaudio email link.

Did you remember NOT to type the "REMOVE_THIS" part of the address?

I received the notification about the new post by email as usual, so something's odd here.

Jens
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