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Generic 2X Car Fan Motor Speed Controller Switch 12V/24V Fan Control | Jumia Nigeria
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Amazon.com: DC 12V 24V 4A 2-Way Adjustable PWM Fan Speed Controller, Automatic PC CPU Case Fan Temperature Control Governor with Sensor Universal for 2 3 4-Wire DC Fan : Electronics
This is a linear/analog 24V fan speed controller by temperature that I was designing for one of my projects with LM35, LM324, TIP122 and TL431. it's a useful little circuit for hobbyists. :
