Simple 40 Watt Inverter using CD4047 

Parts Required

1. IC CD4047
2. 220v to 12-0-12v step down transformer
3. Q1 and Q2 – BC337
4. Q2 and Q3 – TIP3035
5. R1,R2 – 470 ohm
6. R3,R4 – 33k
7. R5 – 150 ohm
8. C1 – 100n
9. C2 – 100u 16v
10. 12v 2-4amp battery
11. Fuse

Above is a very basic 40 watt invertor circuit.