Hello forum , I'm a 3rd yr student and I am trying to make a hearing aid project for that , I should simulate my circuit to get approval from my staffs but unfortunately i'm not able to do it , when I tried to do in proteus it failed as I didn't know the subsitute for headphone jack and also I wasn't able to rectify my errors as well,Could anyone please help me by simulating it

 

subsitute for headphone jack

I would replace the jack with a load that looks like a headphone. Maybe a 100 ohm resistor. What is the impedance of a headphone, what kind of headphone?
I would put a signal source where the mic is. Set the output to 1khz at some very small voltage.