Fan pwm pc 12v wire header guide colours match note only may not 12v pc fan 4 pin pwm header to 3 pin fan Potentiometer controlled behaving schematics newbie forgive
12V PC fan 4 pin PWM header to 3 pin fan
4 wire pc fan
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![circuit design - 4-wire fan controlled by potentiometer and 555 IC not](https://i2.wp.com/i.stack.imgur.com/8UuSg.png)
![12V PC fan 4 pin PWM header to 3 pin fan](https://i2.wp.com/electro-dan.co.uk/pc/fan-4-pin-pwm-to-3-pin/PWMfancontrol.png)
![Smoke from Motherboard when plugging in fan header - CPUs, Motherboards](https://i2.wp.com/tweakers.net/ext/f/yDkNNE8vYYEr8JN7P9R0CGRk/full.png)
![4 Wire PC Fan | ElectroSchematics.com](https://i2.wp.com/www.electroschematics.com/wp-content/uploads/2019/12/2-Fan-Connector-Scheme.png)