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This battery voltage splitter is used where a common is needed; 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 input voltage between pin 8 and pin 5 exceeds 6 V, pin 6 should also be connected to pin 3, as shown by the dashed line. continue reading…

In this circuit, the battery is charged with a constant current that is generally one-tenth of the battery capacity in ampere-hours.
This constant-current battery charger circuit is divided into three sections: constant current source, overcharge protection and deep-discharge protection sections.
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This NiCd battery Charger can charge up to 7 NiCd batteries connected in series. This number can be increased if the power supply is increased with 1.65V for each supplementary battery. If T2 is mounted on a proper heatsink, the input voltage can be increased at a maximum of 25V.
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