I'm new to electronics and I'm making a DIY Bluetooth speaker. The problem I have is with powering the circuit. I plan to use 2 18650 2200mAh 3.7V lithium-ion batteries in series and use an XL6009 step-up converter to boost the 8.4 volts to 12V needed by the TDA7266 Amplifier Board. Also, I'll be using an LM2596 step-down converter for the 5V needed to power the VHM-314 Bluetooth Audio Receiver Board. To charge the 2 18650's, I'm using the HX-2S-A2 BMS module and TP5100 Lithium Battery Charger.
1: Am I doing it right? 2: What kind of adaptor should I use to charge the batteries? 3: Can I use an MDY-03-AF Xiaomi Adaptor to power the circuit and charge the batteries? 4: Do I need any type of Relay in this circuit? 5: How can I automatically stop using the batteries when the adaptor is connected? And here we have my crappy schematics (Sorry!):
Information for the MDY-03-AF Adaptor:
- Model : MDY-03-AF
- Quick Charger 2.0
- Output : DC5V-2A / 9V-1.2A / 12V-1A
- Input : AC 100-240V, 50/60Hz, 0.5A