Machine Gun Sound Using 555 IC

This Circuit using 555 IC produces sound similar to a machine gun.It uses a combination of resistances and capacitances along with 555 IC which produces machine gun sound.

Components used:
1.one 555 IC
2.one BC557 Transistor
3.one 8ohm Speaker
4.two 10nF Ceramic Capacitors
5.one 100uF Electrolytic Capacitor
6.two 10uf Electrolytic Capacitor
7.one 100K resistor
8.one 33K resistor
9.one 6-12v power supply

Steps :
 1.Place 555 IC on BreadBoard.
 2.Connect pin 1 to ground.
 3.Connect pin 2 with pin 6.
 4.Connect pin 4 with pin 8.
5.Connect 10nF cap with one leg connected to pin 5 and other to ground.(ceramic cap do not have +ve and -ve side)
6.Connect a 10nf cap with one leg to pin 2 and other leg to ground.
7.Connect a 33k resistor with one leg at pin 2 and other at pin 3.
8.Place a BC557 on breadboard and connect emitter to VCC.
9.Connect a 100uF cap with longer leg to emitter and shorter one to collector.
10.Connect a 100K resistor between base of transistor and ground.
11.Again Connect a 10uF between Base of transistor and one terminal of speaker,with longer leg of cap towards Base.
12.Connect a 10uf cap between pin 3 of 555  and the same terminal of step 11. above.
13.Connect other terminal of speaker to VCC.
14.Connect pin 8 to VCC.
15.Power on the circuit and you are done.

( NOTE -- i didn't have a 33K resistor so i tried by putting 3x 10K resistors , 2x 1K resistors in series equaling to 32K, And i have also placed a push button between VCC and the circuit in order to get more machine gun like effect manually)