I recently bought a boombox for my mother to play and record cassette tapes. I didn't realize at the time that the boom box did not have a built in microphone. I then bought a condenser microphone for her and plugged it into the audio in jack. It failed to work. I tested the microphone on my computer and I tested the audio in jack with my cell phone. Both worked. I thought the problem may lie in the strength of the signal from the unpowered microphone. So I built a pre-amp circuit modeled after the one in the old lab manual "A First Lab in Cuicuits and Electronics" by Yannis Tsividis.
I'm an amateur when it comes to electronics, where am I going wrong?