how to make 12V to 3.7V 4.2V. Power supply LM317

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Buy DIY Kit LM317 Adjustable Regulated Voltage 110V 220V to 1.25V-12.5V Step-down Power Supply Module PCB Board Electronic kits at Aliexpress for .

DIY Kit LM317 Adjustable Regulated Voltage 110V 220V to 1.25V-12.5V Step-down Power Supply Module PCB Board Electronic kits

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