solar battery charger circuit schematic

By adjusting its Adjust pin, output voltage and current can beregulated. VR is placed between the adjust pin and ground to provide an output voltage of 9 volts tothe battery. Resistor R3 Restrict the charging current and diode D2 prevents discharge ofcurrent from the battery. Transistor T1 and Zener diode ZD act as a cut off switch whenthe battery

is full. Normally T1 is off and battery gets charging current. When the terminal voltage of the battery rises above 6. 8 volts, Zener conducts andprovides base current to T1.

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