Wiring a Double-Female RJ12 RJ12
Telco Jack
Oops, this page doesn't have any of the photos in yet. As
soon as we've got them ready, we'll update this page.
Step 3 -
Preparing a Double-plug Female Throttle Jack
The steps for wiring a double-plug
female throttle jack are the same as for a single-plug jack - except that
there's some extra steps for wiring the second plug. Using a sharp
utility knife, carefully nick and strip about 8 inches of the outer plastic
casing from a length of RJ12 flat cable that is about 18" - 24" long.
It helps
if you purchase double-female throttle jacks that have a built-in strain
relief. If you have such a plug, slide the cable under the slot for
the strain relief.
Wiring
the First Plug
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Using a BBQ lighter, melt 1" of the
plastic coating off the white wire about 2" from the end. Refer to
the photo below. Don't melt too much of the plastic! It's best
to use a salami approach.
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You've now exposed some very fragile
wires. Carefully twist the exposed copper strands on the white wire
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Flux and tin the exposed wire so
that you have a thick strand.
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While the white wire is very fragile,
notice how melting the plastic, rather than using wire-strippers, has added
back some of the stability.
-
You've now converted some fragile
wires into a more stable wire - but it's still fragile!
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Twist the tinned white wire around
the screw lug on the jack, making sure the white wire is aligned with the
white spade terminal. There should be a little slot in the plastic
base where the white spade terminal slides under the screw. The white
wire slides into this same slot.
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Tighten down the screw, making sure
the white wire slides into the same slot as the white spade terminal.
If you don't keep the white wire aligned, you'll slice the wire in two
when you tighten the screw.
-
Repeat the above process for the
other 5 wires.
Here's some photos
of the above steps.
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Wire Threaded/Located
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Inserted in Strain Relief
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Melting the Plastic
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Wire Exposed
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Wire Tinned
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Wire Under Screw
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Wiring the Second
Plug
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Thread the white wire from the first
plug to the second plug. Always work the wire to the inside of the
plug and not to the outside.
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Determine how long the wire should
be stripped so it can be twisted around the screw for the white wire.
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Starting about 1" away from where
you want to expose the copper wires, melt 1" of the plastic coating off
the white wire. Refer to the photo below. Don't melt too much
of the plastic! It's best to use a salami approach - melt a little
bit at a time.
-
You've now exposed some very fragile
wires. Carefully twist the exposed copper strands on the white wire
-
Flux and tin the exposed wire so
that you have a thick silver strand.
-
While the white wire is very fragile,
notice how melting the plastic, rather than using wire-strippers, has added
back some of the stability.
-
You've now converted some fragile
wires into a more stable wire - but it's still fragile!
-
Twist the tinned white wire around
the screw lug on the jack, making sure the white wire is aligned with the
white spade terminal. There should be a little slot in the plastic
base where the white spade terminal slides under the screw. The white
wire slides into this same slot.
-
Tighten down the screw, making sure
the white wire slides into the same slot as the white spade terminal.
If you don't keep the white wire aligned, you'll slice the wire in two
when you tighten the screw.
-
You should have a short piece of
wire that is outside of the screw. Carefully trim this wire back
flush with the screw as shown in the photos below. Make sure you
don't nick the wrong wire!
-
Repeat the above process for the
other 5 wires.
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Cable Threaded
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Melting the Plastic
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Wire Exposed
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Wire Tinned
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Wire Under Screw
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Wire Trimmed
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Dab a bit of ACC under the slot for
the strain relief so that the cable becomes an integral part of the plug.
At this stage, we
should have a single-plug and/or a double-plug female throttle jack that
has about 12" - 18" of cable attached.
We now have to install
this assembly into the side of the module. |