thefish
Enlightened
Ok this has been bugging me for a while now... I have made a constant current voltage boost setup on a proto board and it is powering a single 1 watt LED (I got from China). The power source for this is one Duracell AA battery. So far so good except it has been sitting here on my desk running away for 10.5 hours now and in a dark room it seams to be just as bright, a quick check says the battery is at 1.19 volts now.
The strangest part:
The battery is putting out 1.19V @ 350ma (0.42W) but when I check the values at the LED contacts I am getting 3.1V @ 300ma (0.93W) ... what is going on here? I know this is just not possible, is my amp meter broken or what? But how does that explain 10.5 hours of constant running now?
UPDATE:
Now it is 14 Hours and still going strong battery now 1.14V once again I have to leave so I will shut it down but start it up again later.
Image of LED
Here is the scope
The strangest part:
The battery is putting out 1.19V @ 350ma (0.42W) but when I check the values at the LED contacts I am getting 3.1V @ 300ma (0.93W) ... what is going on here? I know this is just not possible, is my amp meter broken or what? But how does that explain 10.5 hours of constant running now?
UPDATE:
Now it is 14 Hours and still going strong battery now 1.14V once again I have to leave so I will shut it down but start it up again later.
Image of LED
Here is the scope
Last edited: