Hi there, I am wanting to substitute 4 orange LEDs in place of the originals. They like to be run at Vf of 2.0V and If of 20mA. The board will be running off a 12V supply rather than the 9V battery, so I think my calculation should be:
(12 - 4 x 2)/0.02 = 200
So I need a 200R to replace R9. Can someone confirm that I’ve done that correctly?! Thank you.