Emitter follower using the NPN bipolar junction transistor, outputs 0.6V less than the input voltage that we give it. The input voltage just needs to provide a very small amount of current, so it will hold it’s voltage really well no matter how much current the load needs. The BJT will provide the power needed for demanding loads.
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Emitter resistor and load builds up the voltage at the base with a 0.6V difference. It will be 0.6V less than ground due to the base to emitter diode drop.
The current through the emitter resistor and load will depend on their resistance (and voltage drops if applicable).
The emitter resistor is not always needed. Some loads however will throw off the voltage without the emitter resistor, so it is best to just always use one.
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