Adding an external audio input to an old jeep radio.
The tape deck broke-down 3 years ago (alvin and the chipmunks was its demise), and there was no other method of getting audio into the amplifier except using the FM transmitter. Unfortunatley, the fm transmitter (post modifications) could cause nearby cars to become distracted, if they're near the same frequency they would end up with what im listening to, and i didnt want to be the cause for any accidents. Ex: an eldery person listening to soothing jazz suddenly has Ramstein flowing through out their car.
As modifications to this specific Jeep radio were hard to come by, and i only had ~ 3 hours to complete the project, i decided to jump right in. What i was looking for was 3 leads (l, R and center) that went from the tape deck to the preamp / rear amplifier. Then using something to trick the system into staying in tape mode, i should be able to use allready existing circuitry to act as a mux (switching on external audio when tape was selected)
Rensselaer Polytechnic Institute
Electrical & Electrical Power