Search found 19 matches

by rebeltaz
Thu Dec 27, 2007 10:32 am
Forum: General Discussion
Topic: 6v battery indicator
Replies: 13
Views: 5001

MrAl wrote:Hi there Derek,

There are a number of approaches to this problem, the simplest
is probably just a four comparator chip like the LM339 and a
voltage reference diode (both very cheap).
Thank you.. I will see what I can do.
by rebeltaz
Thu Dec 27, 2007 10:30 am
Forum: General Discussion
Topic: 6v battery indicator
Replies: 13
Views: 5001

Battery status with a load or without? (Open circuit or running the camera.) How big a load? What voltage cutoff points are you looking at for "status?" (At what point will the camera quit?) Is there any way to connect directly to the internal battery connections in order to use the camera's batter...
by rebeltaz
Wed Dec 26, 2007 2:01 pm
Forum: General Discussion
Topic: 6v battery indicator
Replies: 13
Views: 5001

6v battery indicator

I built a 4 D-cell battery pack to run my digital camera, but I am now using a 6v 7.2Ah lead-acid battery. I am trying to find a simple schematic using LEDs (maybe red-yellow-green?) to display the battery charge status when I press a momentary pushbutton. Any ideas? Thanks.... --- Derek Tombrello w...
by rebeltaz
Wed Dec 26, 2007 1:45 pm
Forum: General Discussion
Topic: Charlieplexing Article
Replies: 5
Views: 2073