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If you're using a bluetooth connection, you don't need to use an isolation transformer for the radio... you just need a power supply for the bluetooth receiver that's isolated. Which, pretty much any good usb charger should be already. Even if you don't, worst case is you fry the bluetooth thingy. I used a $10 one from ebay that looks like a thumb drive, for my hot chassis radio, plugged into a samsung usb charger.
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