How to fix your low voltage LED Christmas lights

A brief exploration of three styles of wiring used in common low voltage light strings.
These circuits and repairs are only for the low voltage sets of lights that run from battery, solar, USB or plug in power supplies.
Note that for the two/three wire flashing/effects strings the circuitry is similar to the 3-wire strings, but with the LEDs alternating polarity along the string. If rejoining a damaged set then the incorrect polarity of the two LED wires will cause a colour change at that point in the string during flashing effects.
The difference in recording environment is a temporary thing due to catching covid right at the start of a short trip to Glasgow, that has turned into a much longer stay to comply with self isolation times.
I recovered quickly and the lat flow tests strip line faded fast, but I decided to play safe and extend my stay for as long as possible before travelling.
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