The first is the DC power supply from the battery pack, with the first filtering capacitor (leftmost C1 in the basic circuit) and a power switch (power subsystem diagram). This build is made up of four subsystems. Linear regulators are commonly rated up to 1A. The circuit gives you a nice even voltage that is great for low-load applications, such as your Arduino projects. The supply subsystem picture above shows you the basic linear regulator circuit. Here is a really good video explanation of the basic circuit and the theory behind it, produced by Afrotechmods. The basic (one voltage) circuit shown below, is the standard circuit used everywhere. My implementation is a composite of three linear regulator circuits, giving three readily available voltages. Therefore, please use the 9V rail through Vin or the DC connector, or disconnect the supply before connecting to USB. Please note that the +5V supply should not be connected to an Arduino's 5V Vcc simultaneously with any other power source. You'll also need connectors to get the power out to your project.Project box (buy this last after you have your finished board, battery compartment ) (x1).9V connector lead (if you have the above battery compartment) (x1).Battery compartment (8xAA, preferably with 9V connector) (x1).Wires (x1 pack)Heat shrink tubing (optional but recommended) (x1).Perf board / PCB (preferably tracked, approximately 70x45mm) (x1).Put together, it'll cost about £20 in total. This is a long list, but the components themselves are wonderfully cheap, especially if you can buy from a hardware or electrical supplies shop. It's powered by 8 AA batteries so you never need to worry about travel adapters and it's ultra-light for flying! In this tutroial I'll show you how to build - an ultra-convenient, portable bench-top power supply you can take anywhere.
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