Five bi-colour LEDs are used in this circuit. These LEDs first light-up from top bottom ingreen colour one by one and then these LEDs light-up from bottom to top in red colour.
| PARTS LIST | |
| R1 | 10kΩ |
| R2 | 680Ω |
| VR1 | 100kΩ |
| C1 | 22µF 16V |
| C2 | 0.01µF |
| D1-D10 | 1N4001 × 10 |
| L1-L5 | Bi Colour LEDs |
| IC1 | NE555 |
| IC2 | CD4017 |
As IC1 provides clock pulses to the input of decade counter IC2, at each clock pulse, IC2 counts from 0 to 9.
The first five pulses reach the green anodes of the bi-colour LEDs and they light in green colour. The next five pulses reach the red anodes of the LEDs so they light-up in red colour.
BI Colour LEDs
This process is continued regularly. The glowing rate of LEDs can be controlled with the help of potentiometer (VR1).
Please send your ideas, those are very important for our success…
#1 by disco light on April 17th, 2013
disco light
#2 by Yoram on November 3rd, 2011
what is the purpose of the regular diodes d1-d10 ?
#3 by Sarah on August 19th, 2010
Informative blog, bookmarked the blog for hopes to see more information!
#4 by Andrea on August 6th, 2010
Thank you so much for posting all of the excellent information! Looking forward to seeintg more posts.
#5 by seetharaman on May 1st, 2010
Hi D1 to D10 serves no pupose can be deleted. otherwise the cicuit is novel. If you have included with diodes for both LEDs to get supply at certain steps it would have become amber also.
#6 by PERIYASAMY on December 18th, 2009
AS I AM SUCESSFULLY FINISHED WAS YOUR CIRCUITS
#7 by forex robot on December 17th, 2009
Keep posting stuff like this i really like it.