Unstable with 9v P9 battery
#1
Posted 29 February 2012 - 11:39 PM
#2
Posted 01 March 2012 - 10:05 AM
#3
Posted 01 March 2012 - 12:50 PM
Do you have any chance to measure the current drawn from the battery? Isn't it possible that the components draw too much current?
Thanks CW2,
I don't have access to a meter at the moment, but just looked at the specs of the Max7219 and LM35 and together there could be upto 400mA of power for those alone. The spec of the battery is 400mA/h so I'm guessing it aint just up to the job. A 9V Alkaline cell isn't much better either. Will move to 6 x AA I think and see how that goes.
#4
Posted 01 March 2012 - 01:30 PM
#5
Posted 01 March 2012 - 01:37 PM
I think 9V is a bit much, that poor lil regulator has to convert more than 5V to heat. Try 4 AAs = 6V on the input.
Isn't the N+ rated at 7.5 -> 12V on the power input though?
#6
Posted 01 March 2012 - 02:10 PM
The regulator has typical dropout voltage ~1V and max 1.35V, so it requires at least 6V input voltage - 4 fresh AA-s should work, 7.5V is better.Isn't the N+ rated at 7.5 -> 12V on the power input though?
#7
Posted 01 March 2012 - 05:39 PM
#8
Posted 01 March 2012 - 06:05 PM
#9
Posted 01 March 2012 - 08:33 PM
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