How to make a LED / TV backlight tester miniseries part 1

HI WELCOME TO THIS VIDEO MINI SERIES

circuit diagrams
led tester
https://drive.google.com/file/d/1TPqSlVfKSqb4Iu2Lww7hOiruwv2lto7H/view?usp=sharing

led mains indicator
https://drive.google.com/file/d/1s6Yb63tgaxJy93R2jNtKxyGOj_WlWmGG/view?usp=sharing

volt meter
https://drive.google.com/file/d/1k-wbQW4GOIgklofQUtN9Qf8okr0VkSx1/view?usp=sharing

part 1
https://www.youtube.com/watch?v=IGgFjaaFd58&t=1s
part 2
https://www.youtube.com/watch?v=QJjnEtdYOSw&t=384s
part 3
https://www.youtube.com/watch?v=oS0ZcxQmKLM&t=6s
part 4
https://www.youtube.com/watch?v=auJKpo_h9is&t=15s

ALTHOUGH I'm RELATIVELY NEW TO YouTube THERE ARE NOW JUST OVER 100 SUBSCRIBERS THIS IS A BIG INCENTIVE TO ME SO PLEASE LIKE AND SUBSCRIBE. I HAVE A VERY BUSY WORK LIFE BUT IM TRYING TO PRODUCE MORE AND BETTER VIDEOS

MY VIDEO HOW TO MAKE A LED TESTER LINKED BELOW PICKED UP QUITE A BIT OF INTEREST SO I DECIDED TO REMAKE THE VIDEO WITH A LOT MORE DETAIL

THE ORIGINAL DESIGN WAS DONE BY AKA KASYAN SO A BIG THANKS TO THEM AND THAT IS LINKED BELOW

IVE MODIFIED THE DESIGN A BIT WITH THE ADDITION OF MAINS POWER AND A VOLT METER

AKA KASYAN
https://www.youtube.com/watch?v=fxNHY7PXpCY