A common need in many systems is to obtain positive and negative supplies from a single battery. Where current requirements are small, the circuit shown is a simple solution. It provides symmetrical +&- output voltages, both equal to one half the input voltage. The output voltages are referenced to pin 3, output common. If the [...]
Alkaline 9V batteries are ideal for many portable, handheld applications, because they have 650 mAhrs of capacity, operate as low as approximately 6V at the end of their lives, and are available everywhere. The trouble starts when you want to power 5V analog parts, and you need a true swing from ground to 5V. Although [...]
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