thank I feel a bit stupid ! i did some search for voltage divider and I buit a circuit from a regulator and and a potentiometer 10k and i get into the range
but while i was testing my Air/fuel ratio display I saw a little trouble when im in the bar mode the light is clear to red they light and close , but when i go to DOT Mode , if the dot is at half display bar the led in middle are bright but the half part of the bottom still glowing a little, that make the reading hard.
And when i am in bar mode at .50v then i switch to dot mode the voltage go up to .54v ... the range is not the same from dot to bar mode is that normal???
here a shema of what i did for the lm3914 display:
**broken link removed**
I made a power supply from a 7806 with a potentiometer with some capacitor too.
Both are connected to a transfo 9v 210mA and I connect my lm3914 pin 5 to the center pot leg
any idea for my little trouble there
Thanks