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Old 17th October 2006, 12:16 PM   #4081
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by philpoole

I think I'd err to shielded cat 5, as its half the price, and you can get solid core, but this stuff is far prettier.
Worth having I think.

Will you use it for anything else? Or just the power supply?
I want the strandedness of it, for easy soldering and not snapping. Just digital power supplies. When that's all done it's analogue power supplies...
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Old 17th October 2006, 12:26 PM   #4082
awpagan is offline awpagan  Australia
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simon

cat5e run in 4 by twisted pair.

one power, one grd, pre-twisted.
good for noise.
good quality stranded cable.

6mm outside dia. (shief)


separate power supply

watch out for ground loops.

allan
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Old 17th October 2006, 12:26 PM   #4083
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I'm building a dedicated PSU for my TDA1541 DAC (I took a different path when my CD63 died). It will be an onboard PSU, so toroids are quite handy. However, even in an external PSU, I think toroids are better. They have lower reluctance and are more efficient IMO. They also vibrate less, so are quieter.
Its very low current really (unless I do something silly).

I like toroids. Maybe I'm biased, I don't know. I have also used EI transformers with great success too (i.e I had a non KI CD63 and that seemed okay). And it looks like you'll have yours completely shielded, so stray EMI shouldn't be an issue.

Stranded cable does have its benefits. I tend to use solid core internally. Thinking about it, I use stranded for external connections as well. Maybe I'm not awake? It is likely.

Cheers,
Phil
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Old 17th October 2006, 12:49 PM   #4084
SimontY is offline SimontY  United Kingdom
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Allan,

I know that CAT5 is good and useful to have those grounds. I'm opting for something different so I can cram more psu rail feeds into an 8-pin DIN. Also I don't like working with solid core (even though I know it's better).

Groundloops, yep, I'll be listening for the hummm. If it's a problem I'll connect earth to utility only at cdp end. Earth at psu end will be for safety/chassis only.

Phil,

I've sometimes read toroids are bad for digital as they allow HF noise through, whereas old-style ones remove it, which is a bonus. It's also often said toroids are not the best for sound. It's probably good in the KI because a) it's a nice one, b) it's got headroom and many separate windings and c) it's close to sensitive parts. I'll be happy with my 2 transformer from Ebay, and it may join a toroid or two yet, I've been collecting them!!

You seem awake

Simon
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Old 17th October 2006, 01:02 PM   #4085
awpagan is offline awpagan  Australia
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Quote:
Originally posted by SimontY
Allan,

I know that CAT5 is good and useful to have those grounds. I'm opting for something different so I can cram more psu rail feeds into an 8-pin DIN. Also I don't like working with solid core (even though I know it's better).

Groundloops, yep, I'll be listening for the hummm. If it's a problem I'll connect earth to utility only at cdp end. Earth at psu end will be for safety/chassis only.

Phil,

I've sometimes read toroids are bad for digital as they allow HF noise through, whereas old-style ones remove it, which is a bonus. It's also often said toroids are not the best for sound. It's probably good in the KI because a) it's a nice one, b) it's got headroom and many separate windings and c) it's close to sensitive parts. I'll be happy with my 2 transformer from Ebay, and it may join a toroid or two yet, I've been collecting them!!

You seem awake

Simon

my cat5e is not solid core, in fact most cat5e is stranded.

earth
still need a star grd, similar to Brent's
this is where the main earth is connected

will also need psu cabinet and cdp metal at same potiental,
run an earth earth trsp between the two cases.

allan
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Old 17th October 2006, 01:05 PM   #4086
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by awpagan
my cat5e is not solid core, in fact most cat5e is stranded.

earth
still need a star grd, similar to Brent's
this is where the main earth is connected

will also need psu cabinet and cdp metal at same potiental,
run an earth earth trsp between the two cases.

allan
Interestingly, I've only ever seen solid core CAT5. Farnell, for example, have all sorts available though.

My CDP has a star ground. I'll be using it for these.
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Old 17th October 2006, 01:14 PM   #4087
awpagan is offline awpagan  Australia
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Quote:
Originally posted by SimontY


Interestingly, I've only ever seen solid core CAT5. Farnell, for example, have all sorts available though.

My CDP has a star ground. I'll be using it for these.

stranded
simple cat5e "patch" cable.

allan
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Old 17th October 2006, 01:24 PM   #4088
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Quote:
Phil,

I've sometimes read toroids are bad for digital as they allow HF noise through, whereas old-style ones remove it, which is a bonus. It's also often said toroids are not the best for sound. It's probably good in the KI because a) it's a nice one, b) it's got headroom and many separate windings and c) it's close to sensitive parts. I'll be happy with my 2 transformer from Ebay, and it may join a toroid or two yet, I've been collecting them!!

You seem awake

Simon
No wonder you're happy with 2 transformers of Ebay!
Most toroids are nice aren't they?
I'm sure, for these scenarios, as long as they're specified correctly, most reasonably well built transformer will do.
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Old 17th October 2006, 02:12 PM   #4089
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by SimontY
I'm currently searching for a good 8-pin DIN plug and socket combination to use with my external psu. There are some lovely screw-down ones made by Lumberg on Farnell (codes 808271 and 1193062)
...
Only accepts up to 6mm cable though, so getting the wire right will be tricky. The pins only take up to 0.34mm2, again, a bit tight.

Why is nobody else doing external psus? Now I see why....!

Simon
Hi Simon,

Have you though about using XLR's? They can fit bigger cable AFAIK and are a bit more chunky compared to the DIN connectors. OTOH you don't need much current, so the cross-section of CAT-5 will probably be ok.

Ray.
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Old 17th October 2006, 02:20 PM   #4090
6h5c is offline 6h5c  Netherlands
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Default Interesting AD news

Just saw this on the AD website, a new dual opamp: the AD8599. Not available yet, but could be an interesting candidate.

Ray
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