I hope it works ok, its just my best guess at what would work.
Let us know what happens. When are you building it?
Let us know what happens. When are you building it?
Before you suggested the extra 1k resistor, I got the 555's LED flashing happily away but there didn't seem to be a whole heap happening with the relay (it didn't switch on) until, that is, I added the additional 1k resistor.
Having added the 1k resistor, although the relay didn't switch on it did, at least, make a humming sound and even clicked very briefly. This could only be due to some current flowing so, maybe the coil is a bit too thirsty for this circuit (it is only a small one but still too big).
So, would that be the reason you'd recommend a transistor instead?
Do transistors demand less current to flow in order to switch on or off?
Thanks