lunatic2
New Member
I have resolved the problem I was having with driving the luxeon star LED's with a messy gang of transistors.
The circuit that worked is at the link below. It's an Atmel mega8 feeding a 74FCT541 buffer chip, with the PWM fed into the buffer chips output enable gate for brightness control. The buffer chip then drives two ULN2003As which only drive 4 outputs each for power dissipation reasons. Runs cool, works great... Boards are being etched as I type. I tried to post this to the original thread but kept getting errors.
**broken link removed**
The circuit that worked is at the link below. It's an Atmel mega8 feeding a 74FCT541 buffer chip, with the PWM fed into the buffer chips output enable gate for brightness control. The buffer chip then drives two ULN2003As which only drive 4 outputs each for power dissipation reasons. Runs cool, works great... Boards are being etched as I type. I tried to post this to the original thread but kept getting errors.
**broken link removed**