USB +5V (Rot)      -------------------------------------------------
                      |              |              |              |
                    [R1]           [R2]           [R3]           [R4]      (je 56 Ohm)
                      |              |              |              |
                    (LED 1)        (LED 2)        (LED 3)        (LED 4)   (je weiss mit 0,12W)
                      |              |              |              |
USB GND (Schwarz)  -------------------------------------------------