/diy/ - Do It Yourself

Why isn't this circuit working? It's supposed to produce a square wave, I double checked the connections, I've redone the circuit three times with two different 741 ICs. I'm using 0 volts as the negative input, I recall using a similar circuit (if not the same) with an LM324 to make a buzzer buzz and it worked flawlessly (even with no negative voltage). Halp.

I'm going to try with the LM324 again, but I still don't know why it doesn't works with 741s.