Скачать или смотреть Easy Fan Speed Control with a Transistor and Potentiometer - Hacking a fan Part 2

Welcome to Part 2 of hacking a computer fan! In this video, we dive into how to control the speed of a 12V computer fan by building a simple current-limiting controller using a BD139 transistor and a potentiometer.

I'll walk you through the basics of voltage, current, and power, and show you exactly how to wire up a transistor to adjust the fan speed manually. All the parts are cheap or can be salvaged from old electronics — perfect for DIY electronics projects or learning basic circuits.

We’ll cover:
How voltage and current affect fan speed
The basics of using a BD139 transistor
Building a simple adjustable speed controller on a breadboard

Whether you're into electronics repair, PC modding, or beginner DIY electronics projects, this tutorial will help you understand fan control with transistors.

🔧 Parts used:
BD139 NPN transistor
Potentiometer
1k resistor
Breadboard and 12V power supply

00:00 Intro: Hacking a computer fan (Part 2)
00:18 Basics: Voltage, current, and power
01:07 How a transistor works (BD139 explained)
01:35 Circuit design
02:30 Breadboard prototype
03:55 Building the fan speed controller
08:29 Veroboard design
10:43 Testing final build

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