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12V switching power supply, with low output voltage, and making a noise. How starting voltage works, with an explanation you haven't seen yet! 🔴 5v 12v 24v 36v 48v 60v power supplies 2a 3a 4a 5a 8a 10a 15a 20a 25a 30a 40a 50a 60a 100a Power supplies: https://a.aliexpress.com/_mrw4amR 🎞 Pioneer radio bluetooth adaptation, made inside the front, the easiest to do: • Bluetooth on the Pioneer radio, the best ... 🔵 M18 bluetooth board great to be installed inside the fronts of radios and in the auxiliary inputs of sound devices SHOPEE: 1 piece https://s.shopee.com.br/3L5sMwAqAt ALIEXPRES: several pieces 5-50 https://s.click.aliexpress.com/e/_mKe... 🖨 I copied the diagram from this link: http://licotelecom.blogspot.com/2021/...