Today's Message Index:
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1. 07:36 AM - Tiny solder tab (Stuart Hutchison)
2. 08:10 AM - Re: Tiny solder tab (Robert L. Nuckolls, III)
3. 08:46 AM - Re: Tiny solder tab (Christopher SeeStone)
Message 1
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G'day Bob,
I have a tiny soldering job to do because the return wire shown in the photo
has separated from the LED solder tab. The LED OEM (Luminus) data sheet
says that the used and spare cathode (just visible at the top of the LED
base) are interconnected, but there would be more strain on the main wire to
reach the spare solder tab. Perhaps a small jumper between the first and
second cathode (and same for the anodes) would be smart too, but I need to
re-attach the wire without damaging the LED. I have some ideas about how to
provide strain relief and protection for the wires Bob, but what do you
think is the best way to prepare and re-solder to this tiny solder tab,
which is only about 1/16 x 1/8" in size? For reference, the screws are M3.
Cheers, Stu
Message 2
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| Subject: | Re: Tiny solder tab |
At 09:32 AM 6/28/2011, you wrote:
>G'day Bob,
>
>I have a tiny soldering job to do because the return wire shown in
>the photo has separated from the LED solder tab. The LED OEM
>(Luminus) data sheet says that the used and spare cathode (just
>visible at the top of the LED base) are interconnected, but there
>would be more strain on the main wire to reach the spare solder
>tab. Perhaps a small jumper between the first and second cathode
>(and same for the anodes) would be smart too, but I need to
>re-attach the wire without damaging the LED. I have some ideas
>about how to provide strain relief and protection for the wires Bob,
>but what do you think is the best way to prepare and re-solder to
>this tiny solder tab, which is only about 1/16 x 1/8" in size? For
>reference, the screws are M3.
What AWG are these wires? How much current does
the LED draw?
The first idea that comes to mind is replacing the
wires with smaller gage still sufficient to the
current. I'd bet you can go down to 24 or perhaps
26AWG. Remove all the existing 'fat' wires and
bring smaller leads to the outside of the enclosure.
Use some form of adhesive/sealant to secure the wires
as they pass through the housing.
Once in the more robust, outside world, figure out
some form of connector . . . or perhaps splice to
more robust leads and secure the joint mechanically
under a band-clamp.
You need a soldering iron with a small tip and some
63/37 solder. I'd clean off the pads with a piece
of solder-wick, re-tin the pads with small dots of
solder. Tin the ends of wires to be attached. Then
'tack' the wires onto the pads.
Bob . . .
Message 3
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| Subject: | Re: Tiny solder tab |
Stu,
If that's a MCPCB (metal core printed circuit bard, typically aluminum) you
will need to preheat the board (and LED) on a hot plate to properly solder
to the pad. Without heating the board you will never get the solder to flo
w
on the pad. At work we build hundreds of these type of LED assemblies. We
set our hotplate to 150=B0 C and use 63/37 Pb/Sn solder. Place the MCPCB o
n
the hotplate. Place a small piece of solder on the pad. Bring the tinned
wire and soldering iron tip in contact with the pad. The solder should flo
w
freely. Remove the solder iron and the solder should re-solidify on the pa
d
with the wire embedded. Remove the assembly from the hotplate.
Chris Stone
RV-8
OR
On Tue, Jun 28, 2011 at 7:32 AM, Stuart Hutchison <
stuart@stuarthutchison.com.au> wrote:
> **
> G'day Bob,
>
> I have a tiny soldering job to do because the return wire shown in the
> photo has separated from the LED solder tab. The LED OEM (Luminus) data
> sheet says that the used and spare cathode (just visible at the top of th
e
> LED base) are interconnected, but there would be more strain on the
> main wire to reach the spare solder tab. Perhaps a small jumper between
the
> first and second cathode (and same for the anodes) would be smart too, bu
t I
> need to re-attach the wire without damaging the LED. I have some ideas
> about how to provide strain relief and protection for the wires Bob, but
> what do you think is the best way to prepare and re-solder to this tiny
> solder tab, which is only about 1/16 x 1/8" in size? For reference, the
> screws are M3.
>
> Cheers, Stu
>
>
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