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SMD LEDs soldered to a tinned copper wire. The other connection is in series with a current limiting resistor. The resistors are arranged such that the lead of one connects to the next so all LEDs are in parallel. Each SMD LED draws 20mA.
Red = Port or Left. The resistors sit in a slot made with a soldering iron tip run around a cardboard curve. LEDs are CA'd onto foam and resistors and slot are covered/filled with white silicone rubber (after this photo).
Green = Starboard or Right.
Finished lighting. SMD LEDs on the wingtips. Two white LEDs shining forward through the nose cooling intakes. One blue LED embedded in the forward-root of the tail-fin and one blue LED facing rearward out of the fuselage rear (its shining onto the wall).
JST 4-pole connector used (zillion-pole shown). Sourced from RS Components - Parts# 512-8608, 476-6782 & 512-8737.
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