Make DIY Boost converter 3.7v to 12v, Step up voltage adjustable converter - YouTube
Current Power Supply Boost Converter DIY Power Supply Step-up Adjustable | eBay
Amazon.com: QEBIDUM DC DC Boost Converter,0.9V-3V to 3.3V, 0.9V-4.5V to 5V Synchronous Switching Regulator Mini DIY Adjustable Ultra Low Voltage Step Up Booster Converter Board Module for Arduino (3 Packs) : Electronics
DIY 3.7V to 9V Boost Converter Circuit using MC34063
DIY DC-DC Boost Converter (Step up) - Hackster.io
DC to DC Boost Converter DIY || How to Step-up DC Voltage Easily : 3 Steps - Instructables
Boost Converter Circuit using LM555
POW-6 DIY DC18V/AC15V to 3-12V Buck Boost Converter Module Adjustable Step Up/Down Power Supply Module Voltage Regulator - AliExpress