![Driving a PC fan - transistor with or without an optocoupler? - Motors, Mechanics, Power and CNC - Arduino Forum Driving a PC fan - transistor with or without an optocoupler? - Motors, Mechanics, Power and CNC - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/b/6/6/b663556fe678292ddf6a698399c781a284f687a5.png)
Driving a PC fan - transistor with or without an optocoupler? - Motors, Mechanics, Power and CNC - Arduino Forum
![Beginner] help me wrap my head around controlling a single 12V RGB LED - LEDs and Multiplexing - Arduino Forum Beginner] help me wrap my head around controlling a single 12V RGB LED - LEDs and Multiplexing - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/8/f/0/8f015bdfe40736aa261196837c6c250cc0fdef7b.jpeg)
Beginner] help me wrap my head around controlling a single 12V RGB LED - LEDs and Multiplexing - Arduino Forum
![12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables 12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables](https://content.instructables.com/FHP/7D7T/J0IEKT2L/FHP7D7TJ0IEKT2L.png?auto=webp&frame=1&width=320&md=31b7678387eac6b6b542def2981fdf86)
12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables
![12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables 12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables](https://content.instructables.com/FHP/7D7T/J0IEKT2L/FHP7D7TJ0IEKT2L.png?auto=webp&fit=bounds&frame=1&height=1024&width=1024auto=webp&frame=1&height=150)
12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables
![Problem driving a 12V/20mA frequency inverter with BC517 transistor - General Electronics - Arduino Forum Problem driving a 12V/20mA frequency inverter with BC517 transistor - General Electronics - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/8/2/8/828ae63e06a5c98dec050661247b8993014e3fb7.png)