# Turn on and off a dc fan using mosfet

**URL:** <https://forum.arduino.cc/t/turn-on-and-off-a-dc-fan-using-mosfet/1199319>\
**Category:** General Guidance\
**Created:** [December 11, 2023, 5:10pm UTC](https://forum.arduino.cc/t/turn-on-and-off-a-dc-fan-using-mosfet/1199319 "2023-12-11T17:10:25Z")\
**Posts on this page:** 1\
**Showing post:** 20

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**Author:** ![LarryD](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/larryd/32/215550_2.png) [@LarryD](https://forum.arduino.cc/u/LarryD)\
**Post date:** [December 13, 2023, 2:41am UTC](https://forum.arduino.cc/t/turn-on-and-off-a-dc-fan-using-mosfet/1199319/20 "2023-12-13T02:41:17Z")

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> **[Pololu - Understanding Destructive LC Voltage Spikes](https://www.pololu.com/docs/0J16/all)**
>
> Introduction to potentially destructive voltage spikes caused by power lead inductance and low ESR capacitors.

> [@Flyback diodes and why you need them](https://forum.arduino.cc/t/flyback-diodes-and-why-you-need-them/675409):
>
> Any component that relies on an electromagnet or coil of wire for its operation will be inductive, that is the nature of coils of wire. Common examples are relays, solenoid and most types of motor. It is standard practice to put a 'flyback' diode across any inductive load in order to catch the back emf from the inductor when the current is interrupted. This requirement is usually taken at face value without being backed up by any kind of test results or evidence. This tutorial provides the evid…

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