Modding a Vintage Roberts R757 radio to carry a 3.5mm line-in port for an MP3 player

I decided to mod my lovely old radio (actually only 1993 or 96 but it still looks vintage) to use as a portable MP3 player speaker. I wanted to keep the radio functionality and not damage the radio, so I opted for an extra amplifier. I chose a quick and easy solution, I bought a cheap lm386 mini mono amplifier board from ebay and basically shoved it in there.

I also had to sum the stereo signal, essentially mixing it together to input into the amp.

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