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73.19.55.31
In Reply to: RE: Dielectric constant for a DC cable posted by 13th Duke of Wymbourne on February 25, 2020 at 23:41:21
What I meant by just passing signal is that program material is successfully transmitted from source to load, regardless of sound quality. A 69 cent stereo patch cable will pass signal, but even you will agree that a more competent cable of your choice, perhaps a pro audio product will provide a better sounding portrayal of music vs. that of a poor performer.
The price of VH Audio's V-Quad Cu21 is $26.99 per foot. I only require 2 feet for most DIY DC umbilical builds. The price of an Oyaide DC-2.1G DC plug is $20. I tend to only require one DC plug placed at the load end.
$26.99 X 2 = $53.98 + $20 = $73.98 plus some more coin for 2 feet of Techflex Clean Cut sleeving. That cost-level is much less than a pair of high-performance audiophile interconnects, a high-performance audiophile AC power cord, and many high-end capacitors for that matter. If that figure seems like too much to spend, nobody is twisting folks arms to pull the trigger on parts to build a state of the art audiophile DC umbilical.
Follow Ups:
I am in the process of building a 10 conductor DC power supply cable. The connector is dictated by the manufacturer and the only choice is silver or gold plated pins.
I am inclined to stay with silver as the device has the silver pin sockets.
The wire is where I am stuck. The pins are limited to 18AWG. I wanted to go with a PTFE pure copper wire. I was then going to attempt some kind of crazy 10 wire braid or twist and put in a.....well no idea. I can't seem to find a real high quality 10 conductor wire.
My current pick is the 19AWG Kimber TCSS wire.
https://www.thecableco.com/diy-cables-and-connectors/tcss-bulk-single-conductor-bulk-hook-up-wire.html
What length DC umbilical are you going to build, and what is your target budget-level?
It is only going to be 18" or so. There is no budget. I am willing to spend what i need to, its going on an expensive piece of gear.
VH Audio 21 AWG UniCrystal OCC Copper Hookup Wire with AirLok Insulation is excellent for use as a low to medium current DIY DC umbilical build. Label each conductor at both ends, solder the wires to the corresponding terminals, then gently twist the conductors just enough to accomplish a lazy twist so the wiring can have a usable bend radius, which might require a bit longer length than only 18 inches for the solid core wires. However, the cellular/foamed FEP Teflon insulation makes the solid core wire easier to bend than a solid insulation. Use thin heat shrink to hold the wires together, then cover with Techflex braided sleeving for protection.
See link:
Thanks. I will check that out. any reason to choose the 21 AWG over the 18 AWG?
21 AWG solid core wire is much more manageable for a 10-conductor cable assembly than 18 AWG solid core wire with twice the cross section. The key issue to consider is potential voltage drop due to gauge and length, of which 21 AWG when 3 feet long or less will be the most advisable 1.5 percent or less voltage drop for a low-current 5V DC umbilical application, for example. Do you know the rated voltage and current draw involved with all 10 conductors?
This is what I got back from the Manufacturer:
Pin 1, 3, 7 are +12V.
Pin 5, 9 are -12V.
The rest are GND.
Pin 1, 2 are rated for 1.5A
The 21 AWG AirLok hookup wire would be perfect for that application. Can you upload a photo or indicate the make/model of the DC connector? Is it the same type of connector at both ends?
I suggest building the DC umbilical with 2 foot wires, which will shorten a bit after they are gently twisted together with a lazy twist rate to form a bundle with a usable bend radius.
It's a hirose rm-w.
https://www.hirose.com/product/download/?distributor=mouser&type=catalogue&lang=en&num=RM15WTPZ-10P(71)
Make sure to add more heat shrink for strain relief where the wiring is secured to the connector.
Just ordered the wire. I will wait to it comes to order the connectors as I am not sure what size cable clamp to buy. I need to see what the diameter of the 10 wires and some shrink tubing come out to.
I appreciate all the advise.
Ask myself or Chris of VH Audio for any further advice. Maybe Chris can estimate the diameter of the 10-conductor bundle, and a particular size/type of heat shrink to choose. I recommend the Techflex Clean Cut braided sleeving he carries, since it is easy to work with, and provides excellent protection for the purpose.
Ok. Chatted back and forth with Chris a little and ordered everything up. I will report back when it showed up. Mouser is not always the quickest getting to me.
I'll keep an eye out for the report.
Cheers, Duster
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