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FET's or `field effect transistors' can be used for a variety of purposes from audio to power control. Unlike a regular (bipolar) transistor, they are more efficient and responsive to input voltages. There are several benefits to using FET's and are way too numerous to list here, but they are a very good type of transistor where the applications require additional sensitivity. I've used many different types and prefer using them whenever possible for my personal projects.

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