A DIY 1.2V solar garden light. This is a replica of a garden light based on the YX8018B microchip. The 1.2V voltage converter, which powers the LED, is built around two transistors. When the sun is shining, the 3V solar panel generates current to charge the 1.2V battery. During this time, the voltage converter is inactive, as the base of the BC556 PNP transistor receives positive voltage from the solar panel, turning the transistor open. When darkness falls, the solar panel stops supplying power, the BC556 transistor closed, and current flows from the 1.2V battery to power the converter.
Connect a milliammeter across the battery. If working correctly, you will see the sign change from positive to negative when the solar panel is illuminated and shaded.
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