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Metal-Oxide-Semiconductor Field-Effect Transistor, a type of field-effect transistor (FET). MOSFETs have an insulated gate, the voltage of which determines the conductivity of the device. This can be used for amplifying or switching electronic signals. (From: Wikipedia)

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How does this circuit work?

What purpose does the MOSFET serve? I think my coil is 2.5Ohms, not 0.5 like in the circuit. Would this change anything like maybe the strength of the 15k resistor? Circuit diagram I want to use: …
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