Electronic projects




you are here: home page :: projects :: Light & LED :: LED applications :: LED Chaser

LED Chaser

I don't know why, but people like blinking lights. You see LED chasers everywhere, in TV shows (Knight Rider), movies, and store windows. This schematic is my version of a simple 10 LED chaser. There is no 555 timer used because at my local electronics store they are over $4 Cdn. Instead, an oscillator made up of two sections of a 4011 NAND gate is employed. This chip is very inexpensive and extremely common.

Circuit diagram

Parts:
R1 1 Meg 1/4W Resistor
R2 100K Pot
R3 1K 1/4W Resistor or 220Ohm if using blue LEDs
C1 0.1uF 16V Ceramic Disk Capacitor
U1 4011 CMOS NAND Gate
U2 4017 CMOS Counter
LED1-10 LEDs Of Any Colour
MISC 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.

author:
e-mail:
web site: http://www.aaroncake.net
project categories:
folder Audio (49)
folder Power & high voltage (43)
folder Radio (23)
folder Light & LED (31)
folder Tools & measurement (40)
folder Telephone (18)
folder Automotive (10)
folder Microcontrollers (12)
folder Sensors & control (47)
folder Timers & oscillators (40)
folder Miscellaneous (26)

StumbleUpon button

Share this page
Bookmark and Share
project subcategories:
All subcategories
music & light
LED applications
other

similar projects:
6V Ultra-Bright LED Chaser
Bicycle back Safety Light
Dancing LEDs
Dark-activated LED or Lamp Flasher
Fading LEDs
Knightrider lights for model cars
LED or Lamp Flasher
LED or Lamp Pulser
LED Torch
LEDs or Lamps Sequencer

recently added projects:
Doorbell for the Deaf
High Quality Intercom
Combinational Conjuring Trick
POT-PLANT POWER
Ultrasonic Dog Whistle
Quiz Circuit
LED Torch
Insect Repellant
Speaker Microphone Circuit
Magic Wand Conjuring Trick.

most popular projects:
Led display digital Voltmeter
500W low cost 12V to 220V inverter
Low pass filter - Subwoofer
Metal Detector
Basic UPS Power Supply
High And Low Voltage Cut Off With Time Delay
2N3055 Power Amplifier
200W audio amplifier
LED Torch
100W RMS Amplifier


DIY Electronics Projects

Promote Your Page Too