How to Add a Line-In and Bluetooth to old Stereo Systems (2)

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First Video in the series: https://www.youtube.com/watch?v=5K0he6zbebM

Videos about Isolation Transformers: https://www.youtube.com/watch?v=OBYzvkY2-eA and https://www.youtube.com/watch?v=_pEmpvcNmXg ... https://www.youtube.com/watch?v=OuAaHSWzCbQ