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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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LED on MOSFET glows despite only cathode connected

Additionally, don't leave MOSFET gates floating. … But this doesn't explain why you can touch the MOSFET to the led and have it turn on or why it turns on with nothing connected to the drain side of the MOSFET. …
cEEa's user avatar
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2 votes
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High-side switching of 12V LEDs with 5V logic

The picture seems correct, but your wording is wrong. In the picture, you have the collector connected to the gate, emitter collected to ground, and base connected to the Arduino, which is the correct …
cEEa's user avatar
  • 581