Electronic soldering practice board kit with rotating LED circuit

Surface Mount Soldering Practice Board with Rotating LED Circuit
This project is intended for those new to soldering surface mount components. Allows you to hone your skills in soldering resistors, capacitors, diodes and LEDs, transistors, and IC chips. The kit includes a 85x54mm printed circuit board (PCB) and 126 surface mount (SMD) electronic components. A simple spinning light wheel project in the middle section of the PCB gives you a chance to put your newly learned skills to the test!
The areas on the left and right sides of the PCB are for practicing your soldering skills, while the center area has a working electronics project with sequentially flashing colored LEDs.

In the practice areas, you can enhance your surface mount soldering expertise with 78 components in four standard sizes ('1206', '0805', '0603' and '0402'). The board is compatible with surface mount soldering techniques using a soldering iron and fine solder wire, or solder paste and a hot air rework station, or even a professional reflow oven. If you haven't had experience with soldering surface mount components before, you can find many helpful how-to videos online. Each column of components in the practice area is connected to test pads on the bottom of the board, so you can use a multimeter to verify that everything is connected correctly.

The board's project area, if soldered correctly, will reward you with a rotating display of 15 colored LEDs. There are 48 components in the project. A detailed instruction sheet is provided in English. Once you're done soldering, simply connect a battery or other DC voltage between 5V and 12V (not included) to the power input pads to start the rotating light display.

How it works: An NE555 timer chip generates a regular on/off pulse about 5 times per second (the LED in the middle blinks at this rate). The timer is fed to a CD4017 decade counter chip, which sequentially switches with each pulse between turning on one of the 10 LEDs in the circle to create the rotating effect. Another 4 LEDs in the corners blink once per full cycle.