This is the schematic of the Flashing LED Christmas Tree DIY kit. Only uses Resistors, NPN Transistors and Capacitors. Source is a 9V battery. I built here, to better understand the fundamentals of the DIY kit. Much easier to learn, play and make changes on the Everycircuit app, before applying to the physical DIY kit. Fun to play with the resistors and or capacitors, to change the flash rate of the LEDs. Everycircuit rocks! Very educational for me, and the community is so helpful! So worth the $. Thanks guys!