hi,
the input signal is audio signal, which passes into the capacitor, transistor amplified then the signal arrives at the collector. At this point, yes, the transistor needs power. so actually the o/p wires are connected to an audio jack. So one end of audio jack is connected to +V1 and the other is connected to the collector. There is audio signal at the jack, i tested. But then instead of connecting to audio jack, i wanted to view the audio signal so i connected it to an ADC. The ADC signal is then the audio signal.....as you surely understand from this point on.
however, as i viewed the signal it seems like it is riding on the +Vcc DC signal. This was obtained when the collector end wire was connected to the gnd of ADC referenced gnd and the +V1 of battery was connected to the ADC analog input. I am not sure if this is to be expected and it is certainly right since it is what was observed.
but the question is the confusion: at this point, i think the audio signal is riding whatever the dc supply voltage of ADC is. i think reversing the situation, that is connecting collector wire to the analog input of ADC and connecting the +V1 of battery to the gnd ref to ADC i get nothing or same signal riding on the DC signal(i forgot, i have to test again).
Anyway, the signal at the output is just audio signal and I wanted to connect to the ADC. The battery V1 side is creating the confusion.