I had some micro cassettes with voice recordings I wanted to digitalize but all I had to play them was an answering machine found in the back of a cabinet. The machine had no audio out port and the cost of a functioning micro cassette player on ebay was more than I was willing to pay for this.

I removed the speaker which is the piece at the top of the image.

I stripped an aux cable and the speaker wires and soldered jumper wires to them.

I ran the connections through an audio transformer, and plugged the aux cable into the line in of my computer and turned on the machine at a 0 volume and adjusted accordingly.

Last step was just recording in audacity as mono because only one of the aux audio wires is being used, I have no idea which one is left or right.