How to make 12 volt

How to make 12 volt:

How to make 12 volt? this is a circuit diagram to create a 12-voltage power bank using a 3.7-voltage battery and charging with a 5-voltage mobile charger. here used 3 BMS charging circuits for 3 batteries. every circuit takes 3.7 volts and outputs 4.2 volts. 

How to make 12 volt

This circuit can be used in every audio amplifier. Equalizer

transistor board 

Build a Transformer or construct the transformer. Home Theater  5.1

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