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This circuit is an LED Chaser with 81 LEDs using two 4017 ICs and 555 timer The circuit explained in this video here: https://www.youtube.com/watch?v=JoBsPduHEyc PCBWay is the sponsor of this project Website:  www.pcbway.com You can download the Gerber file or reorder this PCB here Circuit diagram: Parts list: IC 4017(2pcs) IC 555 5mm LEDs (81 pcs) 1K resistor(9pcs) 10K resitor 3.3K resistor 470R resistor 2N2222 transistor(9pcs) 1uF capacitor 100K potentiometer 1N4007 diode Video:

LED Chaser/Sequencer using IC 4017 & IC 555 Parts list: IC 4017 IC 555 LEDs (22pcs) Diode 1N4007 (10pcs) Potentiometer 100K Resistor 330 ohm Capacitor 2.2uF 16V I connect two LEDs in parallel to each output. The Diode through positive supply (VCC) used only for reverse polarity protection(not necessary).