Scorpion23

I think that by the time you make the circuit out of standard components you'd be close to emulating the purpose of a 555. Is there a particular reason you're shying away from the IC route?

But anyway, I'll have to check my circuit books for a simple one. I made an LED flasher years ago that alternated between two different color LEDs. I'm pretty sure it let a charge build up in the transistor until it was enough to open the gate. I'll see if I can find it.

Also, I know it's more convention than anything else in a low-voltage circuit, but the switch should be between the buzzer and + terminal.

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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte