How to Power a Project
How Do I Connect My Battery or Power Supply to My Circuit?
There are many ways to actually connect a power supply to your project.
Many projects are built on a breadboard first with wires as a prototype, before they become a final product. There are numerous ways to power your breadboard circuit, many of them involving the same connectors mentioned here.
Once a project is past the prototyping phase, it will usually end up on a PCB. If you plan on making the circuit once or twice, one can transfer the circuit to a prototyping board and wire the circuit up manually to secure project. If you plan on making the circuit more than a few times, you may want to look into designing the circuit with a CAD software (i.e. Eagle) to save time wiring the project or if you plan on shrinking the size of the overall circuit.
One of the most common power connectors used on a finished PCB, in both consumer electronics and hobby electronics alike, is the barrel connector, also know as a barrel jack. These can vary in size, but they all function the same and provide a simply, reliable way to power your project. Depending on your design, you can also pull power from a computer or wall adapter's USB port.
Batteries are generally held in a case that holds the batteries and connects the the circuit via wires or a barrel jack. Some batteries like Lithium Polymer Ion batteries often use a JST connector. Here are a few from our catalog.
To learn more about different power connectors, please see our connectors tutorial.