C CeeCee New Member Aug 26, 2013 #1 Hi guys, I want to create a split rail which supplies +/-5V using 2 9V batteries. I am not sure how to go about it. may you please help.
Hi guys, I want to create a split rail which supplies +/-5V using 2 9V batteries. I am not sure how to go about it. may you please help.
ChrisP58 Well-Known Member Most Helpful Member Aug 26, 2013 #2 I'm assuming you plan to use the two 9V batteries in series with the center point at ground giving + and - 9V. If so, then use an LM78L05 for the +5V, and an LM79L05 for the -5V.
I'm assuming you plan to use the two 9V batteries in series with the center point at ground giving + and - 9V. If so, then use an LM78L05 for the +5V, and an LM79L05 for the -5V.
audioguru Well-Known Member Most Helpful Member Aug 26, 2013 #3 A 9V alkaline battery voltage quickly drops to 7V when an ordinary 5V regulator fails to regulate. You should use low-dropout 5V regulators that work perfectly until the battery voltage drops to 5.5V or less.
A 9V alkaline battery voltage quickly drops to 7V when an ordinary 5V regulator fails to regulate. You should use low-dropout 5V regulators that work perfectly until the battery voltage drops to 5.5V or less.
K KeepItSimpleStupid Well-Known Member Most Helpful Member Aug 26, 2013 #4 How much current do you need? For small currents, you could use a step up DC-DC converter and then use a rail splitter.
How much current do you need? For small currents, you could use a step up DC-DC converter and then use a rail splitter.