We finally upgraded our oldSamsung Galaxy 5 phones to some Google Pixel 3a. Much faster, lots of room for data and stuff like WiFi and Bluetooth work reliably. Nice to join the 21st century. I have an old boat amp and waterproof speakers out in the shed to provide music to the yard. Until now I plugged in with a wire. Figured with the new phone I could use Bluetooth. So I upgraded to the Bluetooth version of the amp.
Not too hard to swap out, but the audio had a terrible buzz with the new amp. Figured it was the power supply but didn’t have a way to test it. Realized I had a nice 12VDC source in my nearby mower battery. Ran some jumper cables and it was clear as a bell. Ordered a new power supply. Hope it does the job. I guess I could get a battery and stick with the cables.