This is cached copy of http://members.shaw.ca/novotill/PwmLedChaser/index.htm as retrieved on 03-04-2005 23:32
Strange LED sequencer. This bizzare but simple PWM circuit fades from LED to LED. This deceptively simple sequencer actually pulse width modulates the LEDs as it fades from one LED to the next.
Search index RadioLocman.com - Circuits is not affiliated with the authors of this page nor responsible for its content.

Strange LED sequencer - This bizzare PWM circuit fades from one LED to the next HOME
This
This deceptively simple sequencer actually pulse width modulates the LEDs as it fades from one LED to the next. Bulbs will last much longer when driven in this gentle manner; add FETs or transistors to the outputs if you wish to drive bulbs. You can reconfigure the capacitors from a delta configuration to a star configuration, or you can remove one of them entirely and the circuit will still function. Use high efficiency red LEDs for best results. This circuit was inspired by the BEAM sequencer circuits on the web. I simply reversed the roles of the resistors-capacitors and 'floated' the capacitors to create this monstrosity which incidentally chirps out RF interference as it hobbles along.
This     HOME     Valid

Service Radiolocman.com does not guarantee absolutely exact display of cached page