We need the DC boost converter circuitto convert input 3.6V or 3.7V or 4V to 12V output. As the circuit diagram of DC boost converter This circuit can help him because: Special feature 1. Used for a power supply, 3.3-5 volts 750 mA up 2. Can apply voltage 12V depends on the power supply. The circuit will show in Figure 5, the operation starts with when we apply the power supply to the circuit. The IC1 will act as the step-up. He bought the project as a PCB board so easy to use but you can buy all parts as the list below. Then, you may assemble circuits on the. I get many questions from my friends. These may be useful for you, too. Note:I bought this kit and not design this circuit myself. I am just.