I created two core circuits exactly the same. The only difference between the two circuits is the voltage regulator choice.
Each circuit can run efficiently on 4.5V to 5.5V. In my first circuit, I used a 7805CT regulator and in the second circuit, I used a LM2940CT regulator because I wanted a longer lasting battery and I heard the 7805CT can subtract alot of voltage from the input.
I have used the same capacitors around each regulator and in each test, the battery was the same (Brand new).
Why is it that with a 7805CT, I can get a 5.01V output, but with a LM2940CT the voltage output slowly decrements starting at 2.5V?
And if LM2940CT is the wrong item, then what can I use in place of a 7805CT that has a smaller voltage drop?
Each circuit can run efficiently on 4.5V to 5.5V. In my first circuit, I used a 7805CT regulator and in the second circuit, I used a LM2940CT regulator because I wanted a longer lasting battery and I heard the 7805CT can subtract alot of voltage from the input.
I have used the same capacitors around each regulator and in each test, the battery was the same (Brand new).
Why is it that with a 7805CT, I can get a 5.01V output, but with a LM2940CT the voltage output slowly decrements starting at 2.5V?
And if LM2940CT is the wrong item, then what can I use in place of a 7805CT that has a smaller voltage drop?