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Need help with an umbilical question

post #1 of 20
5/7/09 at 6:07pm
Thread Starter 
Newest question at the bottom
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post #2 of 20
5/7/09 at 6:25pm
You plan to spend $350 on power connectors and $5 on an IEC? Am I missing something?
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post #3 of 20
5/7/09 at 9:28pm
I'm sort with FA, I'd find a cheaper way to do the umbilical. Have a look at the "ecomate" series by Amphenol. On the other hand a $5 IEC seems fine to me.
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post #4 of 20
5/7/09 at 10:06pm
Thread Starter 
Okay I'm gonna go back in my hole and make a new and complete list which I'd love for you guys to scrutinize and analize for me before I actually order them ...

but for the wire itself.. realizing now that 12awg is too thick, would 18awg, 4 connector speaker wire be good to use or not? And if not, what kind of wire, specifically, should I be looking for the purposes of providing power to the B22?
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post #5 of 20
5/8/09 at 1:59am
I'm prepping for my B22 as well. I got the amphenol connectors n_maher suggested and they're quite nice.

C016 20G003 100 12

C016 20H003 110 12

I'm trying to figure out the cable part myself. I'm not a huge believer in fancy wire so I just sacrificed a standard cable that used to plug into an old laptop brick. The wire is about 12 gauge I think... maybe 18. That might be too ghetto even for me so I'd be interested in what others have to say on the matter. For the time being, free is good so the value equation works out. Plus, I can always rewire the connectors with an upgrade later on since the connectors have easy to use screw connectors.
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post #6 of 20
5/8/09 at 2:21am
I use 18 AWG stranded copper hookup wires, wrapped in heatshrink and braided sleeving for protection.
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post #7 of 20
5/8/09 at 9:43am
Thread Starter 
Thanks amb. A follow up q if I may, do you use the 18AWG for your internal wiring too or do you go for 22-24gauge there?
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post #8 of 20
5/8/09 at 10:03am
Quote:
Originally Posted by Bojamijams View Post
Thanks amb. A follow up q if I may, do you use the 18AWG for your internal wiring too or do you go for 22-24gauge there?
I'm not amb but I use the same 18ga wire size that he does for umbilical cables and use 18ga to get to the power pads on the pcb. Be warned though, it is a very tight fit in the pcb and some 18ga stranded stuff that I have used in the past doesn't fit at all. For all of the audio connections I use 24ga.
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post #9 of 20
5/8/09 at 11:10am
I went with 14ga Amphenol configuration. Photos here:

http://www.head-fi.org/forums/f6/diy.../index278.html
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post #10 of 20
5/8/09 at 4:17pm
What n_maher said.
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post #11 of 20
5/8/09 at 7:50pm
I used the same Amphenol ecomate connectors but instead went with the 6+PE(7 pins) and used 6 pins for V+/ground/V- running individual 20ga. wire for each board, leaving the center pin for SE headphone ground return to the a22 power supplies. I used a Shurter DD12.9111.111 power entry module(data sheet) with filter and built in fuse drawer(sold seperately) so that I could use the built in power switch until I finished the a24/e24 to power a SSR.
The http://www.head-fi.org/forums/f6/let...beta22-343869/ thread and the http://www.head-fi.org/forums/f113/h...-tales-330775/ threads provide mucho examples and give/gave inspiration.

Wire for the IC's from this guy on ebay. (plain hook up wire, nothing special, seller has different colors and gauges)
American Wire Gauge table and AWG Electrical Current Load Limits
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post #12 of 20
5/11/09 at 3:23pm
Thread Starter 
Thanks for that digger

I now have another two questions please if anyone will indulge me

1) Is there any sonic benefit from running individual wires to each board (9 total) in a 3channel B22 or will it just the same as running 3 wires for all 3 boards?

2) Should I be looking into an IEC module with a filter or not? Price goes up quite a bit and I'm not quire sure if the filter will do anything for me due to the design of the S22 itself?
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post #13 of 20
5/11/09 at 3:42pm
for the wire I went with the same wire im making for my IEC power cord the belden 83803. Its RF shielded so the 4th terminal of the amphenol ecomate grounds the shielding to the S22's chassis ground isolating the B22. It was a tough fit in the amphenols though (12 AWG wire).
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post #14 of 20
5/11/09 at 4:21pm
Thread Starter 
Eek 12AWG is too thick for an umbilical. I'd like something a bit more flexible

Not to mention, if its a good idea to use a 9 wire umbilical (related to my post before yours aloksatoor) then there's no way I can use 12AWG
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post #15 of 20
5/11/09 at 4:39pm
You'll find many who do not use a filtered IEC, and if you don't end up going that route and find that maybe you want to add one there are filters that could be added to the inside of the case between your existing IEC and the transformers. Some filtered ones can be expensive yes, the one I linked to was one of the cheapest I could find between Mouser and Digikey.
As for the number of wires from the PS to the amp boards, if your using just one sigma22 PS then 3 wires should be fine as all V+/GND/V- connections at the sigma are connected to one trace, respectively. Of course I have no technical data to back up what I say so that makes it just my own personal opinion. The reason I use more wire and dual supplies in my own balanced setup is more for personal satisfaction than anything else.
It looks perty.
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