I'm a bit of a newbie to this kind of circuitry, I just wondered if someone could give me some kind of idea as how to make a circuit where after 5 or so minutes an LED comes on and if a button is not pressed within 30 seconds a buzzer sounds like some sort of dead man's handle. I will need quite a bit of help, I understand it will probably incorporate a 555 or 556 chip for timing, but other than that, I don't really know what i'm doing.
Are you still looking for help on this? If so, do you need to do it with external timer chips (available as project/demo boards if you don't want to make your own circuits) or could you use the old fasioned octal relays with timer bases? (more expensive but easily configurable).