LED scroller DIY electronics kit
with ten LEDs and variable speed adjustment
This listing is for a red LED scroller DIY kit. The LEDs scroll from left to right, and you can change the speed by adjusting an on board variable resistor. A demonstration can be seen in the above video. The video also acts as the instruction manual for this kit. It shows you how to put it together piece by piece. It also talks a little about the schematic. This kit is based off of the 555 timer, and the CD4017 counter IC. It features 10x 3mm red LEDs. The 555 timer is set up in astable mode, and it creates a square wave. Each pulse from the 555 timer acts to trigger an action in the CD4017 counter IC. The output of the 555 timer is connected to the input clock pin of the CD4017. Each time a pulse hits the clock input, the logic on the output of the CD4017 increments. By this, it is meant that if LED#1 is on, and a pulse hits the clock input of the CD4017, then LED#1 will be turned off, and LED#2 will turn on, and so fourth. We also sell a three LED colour version of this kit for a dollar more.