Sorry I took so long, but I have a few more questions. So why do you in the way have the lm3914 have 12v to the leds. I was under the impression that the 3914 connected the grounds. Could I have a 5v power the leds, that wouldn't change anything else right.
Yes you can use +5V for Vled, I assumed that you had a 12V supply available.
What is the Rlow pin and why is it set to 12v.
Look at the value shown inside of the LM3914 image, its 3V. The 12V is the available source voltage.
And why is Signal set to 6v and then stepped down to 5v.
As I explained the 6V will when the maximum fan voltage is divided down to 6V [resistor divider]
It's set to 5V to show you the reading when the fan voltage is 10V as an example.
I was playing around with this and couldn't get a higher current to the leds. My leds I am using run on 25ma and I feel that 15ma is a little low. I am afraid that they will be a little dim.
You can set the LED mA to 25mA by using R1 and R2 [ make sure that when its 25mA that the Rhi voltage is 6V.
Sorry for the number of questions, but I am still really confused about this.
Thanks
Mike