Transistors: Difference between revisions
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1: Gate - How we control the flow of power using the arduino | 1: Gate - How we control the flow of power using the arduino | ||
2: Drain - Where we plug the fan into to receive the 12v power | 2: Drain - Where we plug the fan into to receive the 12v power | ||
3: Source - Where we retrieve the power, probably a battery or power supply | 3: Source - Where we retrieve the power, probably a battery or power supply | ||
Revision as of 20:57, 29 October 2025
A transistor with gate, drain, and source terminals is known as a field-effect transistor (FET). FETs control the flow of current through a semiconductor by applying a voltage to the gate, which alters the conductivity between the drain and source. Wikipedia autodesk.com
in our case, we have an irf520 transistor and the pinout is like
1: Gate - How we control the flow of power using the arduino
2: Drain - Where we plug the fan into to receive the 12v power
3: Source - Where we retrieve the power, probably a battery or power supply
PC Fan Pinout
Black: Ground Yellow: +5V, +12V or +24V (depends on fan model, usually 12V for desktops, 5V for laptops) Green: Sense. Used to measure RPM Blue: PWM control signal at 5V, 25kHz
