Hi,
i'm Italian, so excuse me if i write incomprehensible phrases in English.
The problem: i have a 22 ohm / 5 w linear potentiometer and i would like to regulate with it the exit of a 12V battery, from 0 to 12V. The battery is a package of 2/3 AAA, ni-mh, 300 mAh. I tried to connect the exit of the pack to the 2 extremities of the pot. and then to check the voltage outgoing from it, but the voltage is always very low, 2..3 V.
Using a series of 2 batteries (1.2V AAA) with the same pot. i can regulate the voltage from 0 to 2.4V. Also adding other batteries to that series i have the same success.
So I thought that the 12V battery was gone.
But making a third test with an alcaline 9V battery and the potentiometer, i have the first result: a lower voltage than the possibility of the battery, 2..3 volt at most.
Why? Could it be, because in the 2nd test i have used a 800 mAh battery, instead in the other two test, a lower capacity batteries (300 mAh and 190 mAh)? Buying a potentiometer with more ohms than 22, could i have a good results?
Thanks
i'm Italian, so excuse me if i write incomprehensible phrases in English.
The problem: i have a 22 ohm / 5 w linear potentiometer and i would like to regulate with it the exit of a 12V battery, from 0 to 12V. The battery is a package of 2/3 AAA, ni-mh, 300 mAh. I tried to connect the exit of the pack to the 2 extremities of the pot. and then to check the voltage outgoing from it, but the voltage is always very low, 2..3 V.
Using a series of 2 batteries (1.2V AAA) with the same pot. i can regulate the voltage from 0 to 2.4V. Also adding other batteries to that series i have the same success.
So I thought that the 12V battery was gone.
But making a third test with an alcaline 9V battery and the potentiometer, i have the first result: a lower voltage than the possibility of the battery, 2..3 volt at most.
Why? Could it be, because in the 2nd test i have used a 800 mAh battery, instead in the other two test, a lower capacity batteries (300 mAh and 190 mAh)? Buying a potentiometer with more ohms than 22, could i have a good results?
Thanks
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