what resistors to pay or what to do ? Answered
OK guys i need help in a simple project
i need to make 15 board every board have 5 white LED its 5mm 3.5 v some boards will be connected
i when and got 150 LED and 5 test board but cuz i don't know what resistors i didn't get any so i made my first board connected a Nokia charger to it , it gives DC 5.7 v and 800mA it burned all 5 LED i used .
i will cut the boards down to 15 or 20 small ones
OK i will connect 5 boards to gather.
how can i calculate what resistor to use .
should i use this charger or i get another one.
what should i pay to make that work
i got 150 resistor 150 ohm
2 220v to 5v 1000 mA adapter
and 5 more test boards
the first test i got from a usb cable the lad give me a blue color that is a sign of great power the with the resistor it gave me white color
so i will make the 2nd test with the adapter