> Why have the 'bridges' between the parallel strings of LED's?

Don't know. The LEDs won't be conducting half the time. It would
help with assembly a bit I guess, as you'd solder two LEDs in anti-
parallel and then join them to the next pair. Maybe ?

Irms = 6fCV for the 0.47uF cap gives 15mA. 20mA would be more
like 0.62uF for 120V/60Hz and 29uF for 230V/50Hz

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