à acheter
https://fr.farnell.com/multicomp/bc817-40/transistor-npn-0-5a-45v-sot23/dp/1798081?st=npn
https://fr.farnell.com/osram-opto-semiconductors/kw-dmln31-sg-6j6k/led-blanche-90lm-cms/dp/2981654