![]() 1.5V Solar Garden Light with Enhanced Features.Solar Pathway Light Circuit with Constant Voltage.Using a 9 V Battery and High Bright White LED. The circuit design is extremely straightforward and may be understood with the following points:Īs can be seen in the given circuit diagram, the design basically consists of a solar panel, a PNP transistor, few LEDs, a battery and a few resistors. The transistor is the only active component which is positioned as a switch for preventing the battery voltage from reaching the connected LEDs during day time.ĭuring broad day light, the solar panel produces the required amount of voltage which is applied across the rechargeable battery via the 1N4007 diode and the resistor R*. This voltage charges the battery gradually from dawn to dusk. The resistor R* value should be adjusted as per the specs of the battery for limiting excessive current to it. The resistor also serves as the current limiting resistor for the connected LEDs when the transistor is switched ON.Īs long as the solar panel generates the optimal amount of power, the positive potential at the base of the transistor keeps it switched OFF.
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