Fan Speed Controlling With Transistor

Computer cooling fans can be a problem for all of us. With a simple transistor, we can adjust the speed of our fan cheaply and easily. Mosfet can be used instead of transistor for more powerful fans.
A list of materials:
Fan
Bc237 transistor
50k potentiometer
1k resistor
Jumper
Mini breadboard
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[@furkankeskin1313]

thanks for sharing

[@hotpeppertechs266]

My pleasure

[@jakubklacior1189]

transistor for what ?

[@kheorafael6109]

Do you have totorial for 5volt fan?

[@H3nrque]

You designed the circuit one way and wired it differently.
I've tested both and the designed one is better, since it increases RPM turning the multimeter clockwise. The way you wired, turning clockwise decreases the fan rotations making it counterintuitive since its the opposite of how 99.99% of knobs are designed.