LEDs, 555s, PWM, Flashers, and Light Chasers Index

LEDs, 555s, PWM, Flashers, and Light Chasers

by Bill Marsden, courtesy of http://forum.allaboutcircuits.com/

I'm moving this article to blog format to allow me greater flexability in editing. Please, do not comment in the blog, if you do I will delete it. If you want to leave a comment do it here. If you want to copy this for any use feel free, but please leave my name and the forum attached.

One of the most common requests at All About Circuits is various methods of flashing LEDs. I'll try to show most of the techniques used for this purpose that have been covered on this site, explaining how and why along the way.


Index

1....LEDs.....................................................................Beginner
2....Current Limiting.......................................o...Beginner/Intermediate
3....The LED / Resistor Only Bargraph....... ..Beginner/Intermediate
4....The 555 Integrated Circuit.........................Beginner/ Intermediate
5....The 555 and PWM.........................................Intermediate
6....Low Power Applications.............................Intermediate
7....The Joule Thief................................................Intermediate
8....From Four, Twenty.........................................Intermediate
9....Light Chasers.............................................o....Intermediate
10..Transistor Drivers..........................................Beginner/ Intermediate
.......BJTs
.......MOSFETs
11..Making Patterns........................................,/..Intermediate
12..Special LED Effects...................................,...Beginner/Intermediate
.......Throbbing LEDs
.......Fading LEDs (AKA Comet Trails)
.......Flickering LEDs (Fire!)
.......RGB LEDs (Millions of Colors)
....Conclusion
....Appendix