I have an old stereo that I want to resurrect and add Bluetooth to it. For that, I bought a Bluetooth module, this one: https://www.aliexpress.com/item/PAM8403-Wireless-Stereo-Audio-Receiver-Module-For-Arduino-Digital-Amplifier-Sound-Loud-Board-Micro-USB-Bluetooth/32668159372.html?spm=a2g0s.9042322.214.171.124b634c4dWucCH7
The problem is when I try to connect it to my stereo. My stereo has a common ground for both the line in and the speakers, while the Bluetooth thing has different grounds for each channel.
I've tried to connect the speakers directly to the bluetooth thing, and it sounds fine, but when I short the grounds the music stops playing.
Is there any way I can connect that to my stereo?