So I started really getting into circuits about a year ago and it has quickly become my new favorite hobby. (A little background into my education, I am a senior physics undergraduate.) Since I started doing circuits I have wanted to learn everything that I can about them. I don't like using IC's without having at least some knowledge of how they work first. That being said I want to make a simple timer circuit. How would I be able to do this without using an IC? In my eyes, using an IC doesn't teach me anything. At this point, all I want to do is learn. My idea that I had was to use a chaser circuit. Something like this.. http://img708.imageshack.us/img708/9961/simplechaser.png [Broken] Now this circuit will have the LED's blink in succession, one right after the other. Having a lower voltage as the source causes it to blink slower. So my thinking is, if I just remove all the LED's except the last one, I can use that as a timer and just adjust the voltage to set the time it takes to turn on. The problem with this is that it only turns on as long as the capacitor is discharging. As soon as the cap is finished discharging it turns off and the cycle continues. Any better ways to do this? (probably) Thanks! :D!