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In Reply to: Re: What? Your attack is way out of line! posted by Dawnrazor on July 21, 2006 at 14:30:06:
I built a very long length 3.5mm stereo mini-plug to stereo rca plugs "Y cable" interconnect cable to serve my bedroom's Tivoli Audio Model One table radio's stereo audio output jacks (it features both line-level and headphone-level output jacks). The cable seems to be similar to what P.Hanley is interested in making? If so, maybe my particular project is lower budget than his wants/needs, though (better cable and connectors to be had).I opted to use an inexpensive 35 foot run of Mogami siamese (dual channel cable intended for S-Video) 75 Ohm coaxial cable (with good capacitance specs for such a long run's needs) terminated at the source end with a Canare 3.5mm stereo mini-plug (it features a rather large barrel and very roomy solder platforms that can easily fit two audio cables within it) and a stereo pair of rca connectors (good quality but nothing special) at the load end.
The stereo "Y cable" connects the radio's stereo (yes, the Tivoli table radio's audio output jack's signal is actually true stereo!) headphone-level output jack to my bedroom system's preamplifier across the room (the very small OD cable is very low-profile when run along the wall's baseboard) which allows arm's length control of it's power-on/off, station selection, volume level, and sounds pretty decent for such a cheap DIY cable project ;-) Maybe someday I'll spring for better cable and better rca's (the Canare 3.5mm stereo mini-plug is a keeper, though).
Follow Ups:
You got it. I think my inquiry came across far more complex than it is. Anyway, I am using canare F10 RCAs and a Neutrik 3.5mm, so it's nothing fancy. THe cable is Belden 89182. However, I am considering simple twisted pair CAT V or a variant, but because of the length of the run (15-16ft) I'm afraid capacitance will catch up with me. Conversely, I am also concerned that the 89182 is a 150ohm cable and may cause other issues. Grr....I know where I'm headed at this point though, so we'll see. Thanks everyone.
Paul
and part it at the RCA end. You'll have to graft a piece of extra shield material to the single of the twisted pair that doesn't get the shiled after you part them.,The shield serves as a common ground - there is only one ground on the 3.5mm anyway.
Belden 89182 is a shielded twisted pair cable so you would need to use two runs of it (stereo pair) for your needs. The connectors you have should be fine depending on the two runs of Belden 89182's combined OD as-terminated to a single Neutrik 3.5mm mini-plug (smaller barrel than the Canare I mentioned), while I agree that I would not feel comfortable using a 150 Ohm cable for line-level audio interconnects. The very inexpensive 75 Ohm Mogami cable I mentioned has a very small OD and should fit easily into the Neutrik 3.5mm mini-plug, and also won't have notable capacitance nor crosstalk issues as mentioned per Cat5...see link:
Actually, I was using the two conductors for the right and left signals, and the drain wire for ground. However, I hadn't thought about the Canare F12 connector. I just cancelled my order for the Neutriks and got a few F12s, thanks!
With that design the left and right channel's signal wires would be twisted together and a major crosstalk issue will be a result (the soundstage will collapse, big time), and the cable when wired that way would not involve a noise cancellation geometry. The drain wire you intend to use as a common return runs parallel to the twisted signal wires and the twisted signal wires would not provide noise cancellation as a twist is designed to do. A single channel's signal and return wires need to be twisted together in order to provide noise cancellation. You would be much better off using a proper stereo pair of cables joined at the 3.5mm stereo mini-plug.
I also have some West Penn 25815 to use if the grounds must remain separate all the way back to the 3.5mm. I just couldn't understand why that would be necessary.
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