This circuit creates a light that "runs" from one side to the other, using a 555 timer and a decade counter.
The Circuit
The 555 timer sets up a clock signal that decides of fast the LED should run across the lights. The decade counter counts each clock pulse and turns on the corresponding LED.
Parts List
| Reference | Value |
|---|---|
| Battery | 9V |
| C1 | 4.7µF |
| D1-D10 | Light-Emitting Diode (LED) |
| R1 | 10k |
| R2 | 10k |
| R3 | 1000 |
| U1 | 555 Timer |
| U2 | CD4017 |
The Layout
This is a big circuit with lots of connections. So be patient, and double-check your connections as you build.
