LED Chaser

Schematic

Parts

Part Total Qty. Description Substitutions R1 1 1 Meg 1/4W Resistor R2 1 100K Pot R3 1 1K 1/4W Resistor 220Ohm if using blue LEDs C1 1 0.1uF 16V Ceramic Disk Capacitor U1 1 4011 CMOS NAND Gate U2 1 4017 CMOS Counter LED1-10 10 LEDs Of Any Colour MISC 1 Board, Sockets For ICs, Knob For R2

Notes

1. Use R2 to adjust the "chase rate".
2. You may need to use a lower value resistor if you wish to use blue LEDs. Try 220 Ohm.
3. You can also use incandescent lamps instead of LEDs. Use transistors to drive them by connecting the base of the transistors to each of the outputs of the 4017 through a 1K resistor. Connect one end of the lamp to the positive supply. Then connect the other end to the collector of the transistor. The emitter then goes to ground. Depending on the lamps, you may need power transistors that are heat sinked.
4. C1 may be replaced with a larger value for a slower "chase rate".
5. If you have problems with weird circuit behavior, try replacing R1 with a 33K resistor, and increasing C1 to 1uF.
6. If you plan to use this circuit in your car, be warned that in some areas it is illegal to have red, blue or yellow flashing lights unless you are an emergency vehicle.