When Christmas is coming, what can an electronics lover do ? A PCB Christmas tree of course ! The idea here was to make a simple Blinky Board that drives 13 LEDs in a blinky sequence. LEDs are driven by astable multivibrator circuit.

Advantages:

This circuit is simple and practical, low power consumption. Fewer parts,and the line is simple and easy to understand.

Step 1: Schematic

Custom PCB x 1
3mm LED X 12 （You can choose your favorite color）
5mm flashing LED X 1
10K Ohms resistance x 3
1K Ohms resistance x 13
100uF Capacitor x 1
SS8050 Transistors x 3
Micro USB socket x 1
Switch x 1
3 AAA battery holder x 1

Step 2:

I want to design a PCB Christmas tree, 2D version is simpler. The 3 AAA battery holder placed on the back so that the Christmas tree can stand up.

I use EasyEDA to design PCB and upload the design to JLCPCB.com to manufacture PCB.

JLCPCB make high quality prototyping PCBs for people all over the world. They have over 300,000 worldwide customers with over 8000 orders per day! They have over 10 years of manufacturing experience and are super reliable. Try it for your self and get 10 PCBs for just $2 at JLCPCB, New registered users US$18 offer , Order here

You can use my gerber files to ordel your own PCBs, and build this DIY Project.

Just a quick example how to order PCB from JLCPCB.com:

1)press "QUOTE NOW"

2)press "Add your gerber files"

3)upload zip or rar

4)all properties could be left default

gerber files

https://github.com/James-workshop/PCB-Christmas-Tree