Square wave oscillator

What all are required?

You would need following parts build the above circuit.

1. C1 – 10 u
2. C2 – 1u
3. C3 – 100n
4. C4,C7- 10n
5. C5 – 1n
6. C6- 100n
7. VR1 – 100k
8. R2 – 10k
9. R3- 3.3k
10. R4 – 68k
11. R5 – 1 K
12. 9v battery
13. IC 555