I have MacMini with broken PWM (pulse-width modulation) 4 wire FAN controller (FAN runs at full speed all the the time) and as MacMini schematic isn't available, I bought an external PWM FAN controller, but turns out that FAN socket +12V is constantly on, so I have idea to add simple switch, which get input from FAN socket PWM control signal + 3.3V and switch +12V, 0.5A output to the external FAN module.
Found this thread - Switching 12V with an active low 5V signal
So basically I need similar schematic, but with lower input voltage and with the contrary logic, so that the output voltage is +12V when the control signal is +3.3V, and 0V when the control signal is 0V.
Maybe adapt this one - NPN transistor to run 12V 0.5A from 3.3v 4mA
Does anybody have such schematic?