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Getting Started with Cubieboard by Olliver M. Schinagl

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Amplifying the voltage and current

All the preceding methods work only if a small amount of current is required. What do you do when there is a higher current demanded? In this case, a simple transistor is used. A transistor can be thought of like a valve on a water pipe. Normally, the valve is closed and no water is allowed to flow. When current is applied to the base B of the transistor, the valve slowly starts to open and conduct current from the collector C to the emitter E. The flow of current is proportional to the current applied to the base, as a transistor is by nature a current amplifier. In addition to that, the current applied to the base is also added to the output of the emitter, as shown in the following diagram:

The voltage supplied ...

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