I couldn't come up with a better title...but here's the explanation.
Basically, I need to create a small circuit for my PC to attach to the power LED. The way my motherboard works is that if the system is powered-on then the LED is ON. But when the system goes to standby the LED starts blinking.
I want to do two things:
- Have two separate color LEDs for each state i.e. powered-on(green) vs standby (amber).
- I want the standby LED to slowly fade-in/out (not fully out though, half-way).
I figured that I can make the blinking signal fade by attaching a capacitor and a diode (to prevent current going back to the motherboard). That should take care of standby light.
However, I can't figure out how to switch LEDs when the current goes from continous to intermittent. So when the system goes to standby the LED switches from green to amber. Any ideas? Btw, I don't want a expensive or complex circuit. I need something that will Not require any outside power-source and will work just from the current coming for the power-LED. Someone suggested me to use two RC circuits as such:
Explanation here: http://forum.allaboutcircuits.com/showpost.php?p=411691&postcount=8