first time builiding my own cables. - AVS Forum
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post #1 of 13 Old 06-17-2007, 07:48 PM - Thread Starter
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After many months of reading what other people have done here on AVS I am going to attempt making my own 3.5mm to rca patch cable. Can anyone give advice if they have tried this themselves? I have ordered up what I think I need from monoprice and partsexpress, anyone found a way to connect the single line for the 3.5mm jack to the double line of the rca stereo connects? Short of shrink tube, and a cable jacket I was not able to find much else to create a "clean" look. your input if any is appreciated.
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post #2 of 13 Old 06-18-2007, 12:00 PM
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Are you trying to build a stereo splitter (i.e. plug 1 end into a portable device and the 2 RCAs into your home stereo)? Will the 3.5mm plug accommodate 2 wires? If so, hook up one 2 conductor wire to left/gnd and another to right/gnd. Use heat shrink to seal everything up. Parts Express used to sell 'Y' pieces of heat shrink for these kinds of splits. If you need more help, please post exactly what parts you are trying to hook up (link to PE website listing would be fine).
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post #3 of 13 Old 06-18-2007, 01:25 PM
 
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Since the ground connection is common, you don't really need to carry it to both RCA connectors.
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post #4 of 13 Old 06-19-2007, 09:31 AM - Thread Starter
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Yes I am indeed trying to make a stereo splitter. I got my 3.5 mm jack (x2) and cable jackets to connect the single line from the 3.5 jack to the stereo rca inputs. I have bought two of everything that way when I mess up my first attempt I can try again. I was thinking of buying some of the wrap you cut with a hot knife. Does anyone have any experience with using this product, if so what should I know before ordering? Thanks.
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post #5 of 13 Old 06-19-2007, 10:34 AM
 
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Quote:


Yes I am indeed trying to make a stereo splitter.

But you're not splitting anything, you're connecting the left channel audio output to a left channel audio input, same for the right.
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post #6 of 13 Old 06-19-2007, 02:24 PM - Thread Starter
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I get what you are trying saying. Thank you. That makes exact sense.

what would be the ideal type of cable to mate between the individual left and right stereo lines and the 3.5mm head? What I was thinking of doing was cutting in half the rca stereo cable. I would then connect the 3.5 mm head to the cut end of the rca cable half. When I started to look at the 3.5 plug it became obvious that the shielded line of the rca cable will not fit the opening of the 3.5 plug. the conclusion is to use a single line into the 3.5 plug, but what type of cable? I was thinking of stripping back much of the rca line and simply using a a cable jacket run the bare wires into the cable jacket then into the 3.5mm jack. Would the loss of shielded line result in loss of sound quality? maybe none of this makes sense, Pictures would help but as I am at the office I am unable to load anything.

Thanks.
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post #7 of 13 Old 06-19-2007, 03:18 PM
 
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If you don't connect the sheild, you won't get any sound....is that what you're asking?
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post #8 of 13 Old 06-19-2007, 04:41 PM
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Typical coax will not fit in a mini connector. Again, please list the exact parts that you have purchased (actual links to the product description).

A typical 3.5mm TRS connector will accommodate a 4mm diameter cable. Using a 2 conductor mic cable of appropriate diameter, hook up each conductor to the signal and the shield to the ground (on the TRS side). You will split the cable maybe 2" or so from the end. 1 leg will get the signal, and the other leg will get the signal + ground shield. Attach an RCA to each end. Having 1 RCA without the ground is not an issue (ground is shared inside the attached unit). Techflex and heatshrink can make the final result look pretty. If you want one of those fancy directional cables, you can ignore the ground completely on the RCA side.
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post #9 of 13 Old 06-19-2007, 04:50 PM
 
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If you want one of those fancy directional cables, you can ignore the ground completely on the RCA side.

If you don't connect the ground, you won't get any signal.
This is an unbalanced circuit, ground/sheild is the return.
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post #10 of 13 Old 06-19-2007, 07:01 PM
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Depends on the cable you're using for your 'project'.

"I've found that when you want to know the truth about someone that someone is probably the last person you should ask." - Gregory House
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post #11 of 13 Old 07-14-2007, 05:20 PM
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Yes make sure that you connect the ground, if not you wont get a signal
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post #12 of 13 Old 08-04-2007, 09:03 PM - Thread Starter
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I very well may be stupid........ Is the ground/sheild soldered directly to the rca solder connection along with the signal channel onto the same "post"? I bought the dayton audio locking rca plugs they are sort of a knock off of the more expensive WBT locking rca connectors. I know that my lack of electrical wiring is causing my confusion but based on the 3.5 mini head jack I see a left, right, and ground "post" to solder my respective wires too. On the RCA side only a single "post" for the audio signal is available. I understand only one ground connection needs to be made on the rca side. Please help.
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post #13 of 13 Old 08-05-2007, 07:52 AM
 
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Quote:


Is the ground/sheild soldered directly to the rca solder connection along with the signal channel onto the same "post"?

No, that would be a dead short. No signal at all.
The center conductor, carrying the signal, connects to the center pin, the sheild (ground/return) connects to the sleeve.
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