Crossfade LEDs
This was one of my first circuits! One of my cousins does metal sculptures and wanted "stage" lighting for a jazz band piece. He requested 4 colors of LEDs that would fade in and out like stage lighting in a bar. I created this circuit using a 555 timer to pulse a 4017 decade counter. Each set of LEDs includes capacitors to control the fade in and fade out as the 4017 switches power to the next set. In addition it also contains a sound-to-light circuit to pulse to music.