This scheme allows you to connect almost any device (phone, tablet, mp3 player, navigator, toys, etc.) that uses a 3.7 volt battery. Only if you connect a powerful device, for example, a tablet, you may need a 1.5-2A diode and a more powerful charger. It all depends on the specific case.
Homemade 4.2 Volt 2 Amp Power Supply with Video: • Блок питания 4.2V 2A своими руками для зам...
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