Nana we are not supposed to do your homework for you, but the following may help you understand better where you are going wrong.I calculated the impedance of the 2 capacitors at 100 Hz, 1 kHz and 20 kHz: (in ohms)
Cap |
X 100 Hz |
X 1 kHz |
X 20 kHz |
510pF |
3,122,268 |
312,227 |
15,611 |
120nF |
13,270 |
1,327 |
66 |
Sorry, Excel cells don't post too well here....But you can see that at 100 Hz the 510 pf capacitor that you have in series between your two stages has an impedance of over 3 Megohms. So in combination with R6 you are attenuating your signal by 200 times (ie by 1/200th).Similarly the 120 nF in combination with R1 will drop your signal by 1/2 at 100 Hz and by 1/200th at 20 kHz.So C1 is shorting out most of your signal and C2 is blocking most of it.Can I gently suggest that you may have swapped these two capacitors from where they should be?