It detects when the solar cell is in the dark, and starts up the circuit inside that boosts the 1.2 volts from the battery to over 3 volts, and sends that to the LED. It charges the 1.2 volt battery during the day, using power from the 2.5 volt solar cell. The integrated circuit does several things. These come at a rate so fast our eyes see it as continuous light.Ībove is the schematic for the Solar Garden Light, using the 5252F integrated circuit and a 330 microHenry inductor. The answer is a clever circuit that uses a steady 1.2 volt source, and produces a series of spikes of higher voltage. Inside a solar garden light, we find a single 1.2 volt battery. Blue and white light emitting diodes need more than 2 volts to run. It seems to work with red lights, but not with blue or white. Try connecting a solar cell that produces 2 volts to a light emitting diode.
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