A power supply is a machine that supplies power to another machine, at a particular voltage level, voltage type and current level. For example, when we talk about a 9VDC @ 500mA power supply can provide as much as 500mA of current and the voltage will be at least 9V DC up to that maximum current level. While it seems simple, power supplies have a number of little hang-ups that can be very tricky for the uninitiated. For example, unregulated supplies say they can provide 9V but really maybe outputting 15V! The very common 7805 regulator datasheet claims it can regulate up to 1000 mA of current, but when you put a 15V supply on one side, it overheats and shuts down!

Why a power supply?

When you begin out with electronics, you'll learn a lot about power supplies - they're in every electronics project and they are the backbone of everything! A great power supply will get your project hum forward nicely. A bad power supply will make life frustrating: stuff will work sometimes but not others, inconsistent results, motors not working, sensor data always off. Knowing power supplies (boring though they may be) is key to getting your project work!

A lot of personalities don't pay much attentiveness to power supplies until problems show up. We believe you should always remember regarding your power supply from day one - How are you going to power it? How long will the batteries last? Will it overheat? Can it get damaged by accidentally plugging in the wrong thing?

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