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Old 12-03-2010, 02:00 AM
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Using a flux-core solder should be fine unless the LEDs are old and/or been improperly stored -in which case the copper pads may be oxidized.

Most soldering difficulties come from improper technique. It's important to remember that you are joining TWO metal surfaces with a 3rd metal (solder) and therefore BOTH surfaces must be hot enough to melt solder. A decent soldering iron is also good to have. A reasonable iron will cost a good $50 at Active. Good brands include Hakko and Weller.

-And try not to breathe the fumes from the solder; NOT good for you.
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