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[FAQ] How to make a Mini-RCA & Mini-Mini Interconnects for your amp

post #1 of 18
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As per the title, I'm going to explain how to make a mini jack to dual RCA interconnect that could be used to connect your PC soundcard to your headphone amp/DAC/speaker amp. However, I put together this cable BEFORE thinking of doing a FAQ, so I guess I'll try to explain myself as much as possible.

First things first....MATERIALS. You're free to buy anything you want, but I tend to be on the budget side, and still strive for quality. The simplest ICs are made with ready-made cables, like the following:

-Canare L-4E6S Star Quad Micophone Cable
-Mogami W2534 & W2893 Neglex Quad Mic Cable

Mic cables are easy to work with, as they already have 4 conductors, most likely the max. number you're going to use. Also, the aren't too think or thin, and fit into the jacks snugly. BTW, they're also CHEAP. There's also another option with using regular 21-24 AWG stranded wire and braiding them in a Litz configuration, but that's another FAQ.

Talking about jacks, there is a plethora of jacks available. A simple search reveals them all. However, as stated above, I like to be on the budget side, except I also care about quality. Now, you could get jacks that are worth a couple hundred dollars, but it's ultimately up to you. The jacks I frequent are Switchcrafts. They are made right here in Chicago, and are of very high quality. HOWEVER, most retail stores tend to sell them at very high prices, so I suggest going to these online/brick and mortar stores:

-Markertek ($100 min. order for International, BUT can be negotiated)
-Audiogear (they only ship to the US, good prices though)

Next up, TOOLS...You're going to need at least the following:

-Soldering Iron (a Pencil type iron with a pointed/chisel tip is ideal); Stray away from questionable brands, and stick with Hakko, Weller, and other well known brands. NO COLD HEAT IRONS, THEY DON'T WORK!!!!! ***An iron's wattage determines how hot it gets. An iron of 15W to 30W is plenty for fine electrical work like this***
-Solder (logical companion.....); At least 0.20-0.32 dia. 63% tin/37% lead is best (often called 'High Tech solder'). Brands: Kester, WBT, Cardas...
-Iron holder/cleaner; as simple as a curled piece of 8 AWG wire. A damp sponge or kitchen paper is preferable.
-Heatshrink; GET AN ASSORTMENT. There are many types of heatshrink out there, but 2:1 shrink is most common. A 2:1 shrink means that it'll shrink to 1/2 it's original size (3:1; 1/3 shrunk size). Be sure to use the correct size for the job (a piece of heatshrink that is slightly bigger than the material is ideal)
-Wire Strippers
-Side Cutters
-Pliers (to clamp the strain relief)
-Lighters (to shrink the heatshrink...you can also use a heat gun)



For more info, go here: Getting Started in Audio DIY

***IMPORTANT: WASH YOU HANDS AFTER YOU'VE WORKED WITH SOLDER, I AM NOT LIABLE FOR ANY LEAD POISONING***

Onto the ACTUAL steps...

1) Lay out the cable (I'm going to use Canare Star Quad) in front of you and cut to desired length.

2) Strip the rubber insulation and the metal braided shielding to get to the 4 21 AWG conductors. Neat thing about Star Quad is that the conductors tend to be in two colours only, so it makes life ALOT easier.



3) Unravel the twisted wires and designate roles to each of them. I usually use white as my grounds and twist the two wires together. The blues I then designate as left or right channel.

4) Strip all of your wires. You can tin the wires at this point, which makes it easier to work with, but is entirely up to you.

5) Open up your jacks. There should be 3 parts to it: a) A clear plastic tube, B) The metal/plastic shell which covers up the actual connector, and C) The connector itself.





Up first, the 3.5mm connector. It will have a rod in the middle, and flanges on either side. The biggest flange (with the cable clamp) is usually the ground, which is the part furthest away from the tip of the connector. This is where you solder the two white wires I mentioned earlier to. The rod is the left channel, which corresponds to the tip of the actual 3.5mm jack (ie, before the first black stripe). The other smaller flange is your right channel, which corresponds to the area in between the two black stripes.


Simply put, the flange with the hole is ALWAYS RIGHT, and the rod is ALWAYS LEFT

Next, the RCA jack. Since RCA are what we call phono/mono jacks, they only carry on channel of audio per jack. As a result, there is only a rod and a ground. Using the white wire again, it will connect to the flange, which is the ground, and corresponds to the sleeve that slides over a RCA plug. The rod is the left/right channel, and it corresponds to the rod of the RCA jack.



6) Construct your y-split. Pick a spot on the Star Quad and cut the insulation & shielding off. Unravel the four wire and retwist them into pairs. REMEMBER, ONE WHITE WIRE WITH ONE BLUE WIRE, NOT BLUE-BLUE AND WHITE-WHITE. Heatshrink the wires afterward.

7) Slide enough heatshrink onto the y-split until it doesn't move or dislodge itself. I also like to slide enough heatshrink onto the wires so that the diameter will be close to the opening of the metal sleeve of the RCA/3.5mm jacks.





8) Solder your wires to the appropriate parts. NOTE: you don't have to distinguish which blue wire is right/left channel, we'll do that later. REMEMBER TO SLIDE THE BARREL OF THE JACK AND ITS PLASTIC SLEEVE ONTO THE WIRE BEFORE SOLDERING!!!!! Clamp all of the wires onto the barrel with pliers.

I'm not going to teach anyone how to solder, but some hints:
-Heat the part up adjacent to the area you want the solder to be. It flows toward heat.
-Make sure the part is hot enough. If not, then you'll get a cold joint, a joint that is really crappy. A good one should be shiny, NOT dull.

More info + videos here: http://tangentsoft.net/elec/movies/

9) MAKE SURE THE DIFFERENT CHANNELS ARE NOT TOUCHING INSIDE THE CONNECTOR. Just to be sure, I cut a piece of heatshrink and physically blocked off the channels. Screw on the metal sleeve now.

10) To check the different channels, I just grab some alligator clips + wires along with a battery and lightbulb, and construct a simple circuit to see which RCA jack would corresponds to the channel. Then I would label which is which with a simple piece of heatshrink on the jack.

11) You're done! Connect to amp and have an eargasm.


GREAT SUCCESS!

Brendan
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post #2 of 18
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Comments? Things I need to improve?
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post #3 of 18
Very nice guide . I'll being doing dual 1/4 -> RCA myself when I have the time.

Solid attempt at pics of the inner-workings of the plugs - they're so damn small that it's a nightmare to take a good shot of them (for me anyway).

Rep +
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post #4 of 18
very nice , but u need a heat gun
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post #5 of 18
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Oh, and BTW, I found it very helpful to have one of the compress air dusters, as I can turn it upside down and immediately 'freeze' the heatshrink in any position I want. The liquid that comes out is pretty darn cold, as I've gotten burnt by it...

Brendan
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post #6 of 18
Quote:
Originally Posted by cyberspyder View Post
Oh, and BTW, I found it very helpful to have one of the compress air dusters, as I can turn it upside down and immediately 'freeze' the heatshrink in any position I want. The liquid that comes out is pretty darn cold, as I've gotten burnt by it...

Brendan
Just watch out breathing that stuff - just as it'll burn you it'll wreak havoc on your lungs. BTW - this thread is added to the "essential reading" directory.
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post #7 of 18
Thread Starter 
Quote:
Originally Posted by Chipp View Post
Just watch out breathing that stuff - just as it'll burn you it'll wreak havoc on your lungs. BTW - this thread is added to the "essential reading" directory.
True that...thanks for the warning.
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post #8 of 18
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Crap, double post.
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post #9 of 18
Thread Starter 
I am going to add on to this guide and post one on how to do a simple Mini-Mini Interconnect for your amp. NO pictures though, as I haven't made one--YET.

Everything is the same, but of course in your bill of materials, you would change your RCA jacks to a mini jack. Follow steps 1 thru 5, BUT here's where the similarities end.

6) After identifying the different channels, solder ONE BLUE wire/conductor to ONE of the signal channels (either the small flange OR the rod), and solder the OTHER BLUE wire to the OTHER signal channel. The two white wires goes to the GROUND (the large flange), and are automatically designated as ground. In case you forgot what signal channels are, there are pictures to help you with that:



Put all the necessary heatshrink on, and close her up, remembering to slide on the plastic insulator.

***REMEMBER, DO ONLY ONE OF THE TWO MINI 3.5MM JACKS RIGHT NOW, DO NOT SOLDER THE OTHER JACK ON YET!!!***

7) Bring out your trusty circuit/9V battery/multimeter, used previously in step 10 of the previous guide:

Quote:
10) To check the different channels, I just grab some alligator clips + wires along with a battery and lightbulb, and construct a simple circuit to see which RCA jack would corresponds to the channel. Then I would label which is which with a simple piece of heatshrink on the jack.
You do the same thing, except now you're checking for continuity between the one jack and the other and figuring out which blue wire corresponds to which channel. Label their specific channel with your desired form of label (I just use masking tape).

8) Solder your 2nd mini jack on now, taking care to include ALL of the necessary connector parts, like the metal barrel and the plastic insulating sleeve. Also, put your desired heatshrink on now.

9) Connect to amp for an absolute EARGASM.

GREAT SUCCESS!

Brendan
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post #10 of 18
you should be using blue for ground and white for signal.
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Overclock.net › Forums › Components › Sound Cards and Computer Audio › [FAQ] How to make a Mini-RCA & Mini-Mini Interconnects for your amp