![]() I chose not to use those for this project because 1) I didn’t have any in my parts bin, and 2) it would be much harder to understand. You might also be interested in our guide to buying your first multimeter, and picking an oscilloscope.Īnother thing you might want to consider, depending on the nature of your project is that there are more efficient circuit designs out there for USB charger circuits that utilize semiconductors and switching. Here’s a han dy parts list for this project to get you started: RELATED: Voltage Divider Calculator Parts List for this Project You might start with our tutorial called “ What is voltage?” Another great way to step down voltage for small loads is to use a voltage divider. As we go through this tutorial we will link quite a few additional resources in case you need some help. If you’re new to electronics we have a ton of resources to help you get started. We will do that with a LM7805 voltage regulator and heatsink. Additionally, we need to step down our voltage from 12V to 5V. ![]() Voltage Regulation – Finally, we want to ensure our circuit outputs a consistent voltage, even if the power from the mains is not stable.We will add some capacitors to solve this problem. Filtration – We want to make sure this circuit is stable and not producing ripple.We will do that by building a super simple full wave bridge rectifier circuit. Rectification – After stepping down the voltage to 12 volts AC, we need to convert it to DC or direct current.In our case we’re going to step down the voltage to 12 volts AC. Voltage Step Down – First thing we have to do is step the voltage down from 120 volts AC to something low enough we can work with.We will step through this build in 4 phases of construction: A USB charger circuit ouputs a regulated 5V that can be used to power USB devices or even charge mobile phones and other devices. In this project we’re going to make a USB charger circuit from some simple parts we have lying around the house.
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