Printable View
What is the MAXIMUM VOLTAGE to feed into these yellow displays.
(MAN3840A)
Right now, to be on the safe side, I use 3V, which give me the brightness I want, but I'd like to feed regular 5V with a resistor
http://i24.photobucket.com/albums/c2...t/altsmall.jpg
Treat each segment as it's own LED.. If you can do it with an LED then you can do it with the 7 Segment display.
Trev
Does it mean that I have to put a resistor at each segment (10 digitsX7=70 resistors?)
Hello Jack
I think that you may be able to use a higher supply voltage and only one resistor dependent on the voltage drop and current drain for each segment. If the segments act like a typical led ie 2volt drop and 20 ma drain then you should be able to feed 32 segments with one 100ohm resistor - see this link
http://ledcalc.com/
I would wait for confirmation from others though first!!
Regards
David
If you want all of the segments to have a consistent brightness, then yes. When you use a common resistor for all segments then the current draw changes with how many segments are lit. This change in brightness may or may not be enough to bother you.Quote:
Originally Posted by Jackpilot
What kind of circuit/controller are you using to drive the displays?