led effect

Hi everyone, I'm working on a project to make an LED that fades in and out (breathing effect) and operates on a 12V power source. I have the following components: 12v strip led 3x 3.7v batteries connected in series = 12v (with added extra voltage when fully charged resulting in 12v) BC547 NPN...

I have this non-latching metal power switch with an LED inside, to light up the "power symbol" on the switch. I am currently looking after a circuit that can make this LED gently fade-in whenever power is connected to the circuit. The switch uses a "standard" (or "normal") LED. The...