A / B / Y LED question..

[darrencp]

Hey!

I've built the below - as far as adding the LEDs.

Should there not be a 4.7K resistor before each LED in the layout? or one at least before the first LED?




Cheers
Darren

[antonis]

R1 serves as Current limiting resistor for A or B LEDs..  R2 for A&B LED..

You may resize them according to your particular LEDs current rating..

P.S.
Their actual placement (before or after the LEDs) doesn't mind at all as long as resistor + LED are set in series..

[darrencp]

excellent! thanks dude!

[antonis]

You're welcome, mate..!!