Would this work as a simple linear level meter ?
Posted: Wed Mar 10, 2010 10:08 pm
Have not tried it yet. 
The leftmost resistor set to maximum led current for maximum expected voltage at (+)
A varying voltage at the left terminals will increase the brightness of each led and will step to turn on the next for every 0.6V increment. Would it ?
Seems it would work from a minimum of 2V ; diodes with less dropout would expand the scale...
Miguel
Code: Select all
(+)----.----|>|----.----|>|----.----|>|----.----|>|----.----|>|----.----|>|----.----|>|----.----|>|----.----|>|----.---
| | | | | | | | | |
L L L L L L L L L L
| | | | | | | | | |
R R R R R R R R R R
| | | | | | | | | |
(-)----.-----------.-----------.-----------.-----------.-----------.-----------.-----------.-----------.-----------.---
--|>|-- = Si diode
L = LED
R = resistorA varying voltage at the left terminals will increase the brightness of each led and will step to turn on the next for every 0.6V increment. Would it ?
Seems it would work from a minimum of 2V ; diodes with less dropout would expand the scale...
Miguel