Even before I get to do anything with my 555 timer I thought I'd play with it and already I have fallen at the first hurdle (perhaps even before getting to the starting gate) :(
It wired up as per http://www.instructables.com/file/F0UNQNHH742SU5Y for an astable timer (or so I hope).
I've plugged in a PC scope that I think I've gotten to grips with and have pin 3 on the scope and it grounded.
I have a 5v power supply which I use to power my breadboard Arduino plugged in (no MEGA328 or anything).
I have lovely square wave output... that doesn't change when I change the resistor values, pull out the capacitors.... WTF?!
And the thing that really bothers me though is the 555 is getting very hot! Is this normal or am I stoking up a little BBQ.
Changing briefly to a 9v battery and the square wave goes away to be replaced by nothing useful looking. So I deduce the square wave signal is something to do with the 5v regulated power supply (which is powered by a 10v DC plug in the wall thingy) although that defeats my logic as well.
Obviously I'm looking for the wiring cock-up but don't see it so will have to plug it back in soon sometime but I'm worried I may just burn all my sausages and burgers before I get it sorted.