So call me nuts when I say I'm building my own pwn fan controller. I've got all the parts and tools, and I'm just waiting for fall semester to start so I can get into the analog circuits lab down on campus to test my circuit as I'm building it.
My one question is this: I want a smoother output from my Pulse Width Modulation circuit. Normally, you get a modified square wave out of a PWM circuit, and I want to smooth that out so that the voltage the fans see is smoother. I thought about putting a resistor and capacitor in series connected to the output, with the fan(s) connected across the capacitor, but then at full power, the resistor will soak up some of the voltage.
But what about an inductor? Putting an inductor between the fan and the output of the PWM circuit would help to smooth out the waveform without ruining the full-power performance. It would look like this:
Do you see any problem with this circuit?
My one question is this: I want a smoother output from my Pulse Width Modulation circuit. Normally, you get a modified square wave out of a PWM circuit, and I want to smooth that out so that the voltage the fans see is smoother. I thought about putting a resistor and capacitor in series connected to the output, with the fan(s) connected across the capacitor, but then at full power, the resistor will soak up some of the voltage.
But what about an inductor? Putting an inductor between the fan and the output of the PWM circuit would help to smooth out the waveform without ruining the full-power performance. It would look like this:
Do you see any problem with this circuit?
Code:
from PWM
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--- <-transistor (so it can handle larger loads)
12V_/ \___(inductor)____(fan)___GND