Getting closer to 3 fully working units (minimum board count I could order, so I populated each of them...), so I thought you might be interested is seeing another build ??
Also I have question regarding the fan running frequency and can it be changed ? My fans themselves, when connected to a dc supply make no noise, but when being driven by the system emit an audible noise, so was hoping to negate the noise....
Forget the fan speed question, I tried a different brand, still a Sino cheapo, which doesn't exhibit the problem, so I'm lucky I have a few of the 'good' ones around.
Julian
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I had started with one design and then realised it was overkill -- then ended on a simple non rpm controlled 40x40 fan.
The non rpm fans use voltage to run, so it means you have to get a certain output level for them to rotate, so that they do not stall, so one gets limited to about pwm values of 220 - 255.
Less voltage = slower speed. Not the best method. Which really means the RGB was also redundant. I just tend to run the fan all the time at 100%.
Sometimes after deciding on a design, one thinks of a better component or way of doing things. Its just hard to change once you put something out there and a lot of people are using it. Retrofitting is a master art.
I ended up with one of those magnetic levitation ones which are pretty much silent with little or no vibration. At the end of they day you get what you pay for. I still the much cheaper 40x40 original one on another controller.
regards
Robert
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Tis a pity that the Nano doesn't provide a true analogue output, without adding additional components, to convert the PWM to a 'true' analogue, but then you'd probably still need a current sink to drive anything...
Yours
Julian
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Hi Robert,
Getting closer to 3 fully working units (minimum board count I could order, so I populated each of them...), so I thought you might be interested is seeing another build ??
Also I have question regarding the fan running frequency and can it be changed ? My fans themselves, when connected to a dc supply make no noise, but when being driven by the system emit an audible noise, so was hoping to negate the noise....
Julian
Hi Robert,
Forget the fan speed question, I tried a different brand, still a Sino cheapo, which doesn't exhibit the problem, so I'm lucky I have a few of the 'good' ones around.
Julian
I had started with one design and then realised it was overkill -- then ended on a simple non rpm controlled 40x40 fan.
The non rpm fans use voltage to run, so it means you have to get a certain output level for them to rotate, so that they do not stall, so one gets limited to about pwm values of 220 - 255.
Less voltage = slower speed. Not the best method. Which really means the RGB was also redundant. I just tend to run the fan all the time at 100%.
Sometimes after deciding on a design, one thinks of a better component or way of doing things. Its just hard to change once you put something out there and a lot of people are using it. Retrofitting is a master art.
I ended up with one of those magnetic levitation ones which are pretty much silent with little or no vibration. At the end of they day you get what you pay for. I still the much cheaper 40x40 original one on another controller.
regards
Robert
Tis a pity that the Nano doesn't provide a true analogue output, without adding additional components, to convert the PWM to a 'true' analogue, but then you'd probably still need a current sink to drive anything...
Yours
Julian