Buy a 1W white LED, use the mobile phone battery to try, really bright, you can make a small table lamp.
Use a wine glass-shaped milky plastic bottle cap to make a lampshade. Leading the positive and negative wires from the rear of the LED heat sink (self-contained), passing through the lampshade and introducing the lamp holder through the elbow. The shape of the lamp came out. In order to facilitate charging, a solar panel is used, but the voltage is too low, and only one battery can be charged. For this reason, a booster plate is added. In order to use in rainy days, AC charging is added, and the LED lamp can be illuminated under AC power supply. The terminal voltage of this LED is 3+2V and the rated current is 350mA. After experiment, the voltage can reach 4.8V and still work normally. It is limited to about 350mA.
The booster board is an oscillating circuit cut from the old 6V emergency light board without any modification (see the dotted line frame in the figure), and then the charging current is supplied by bridge rectification. The author believes that the oscillating circuit such as mosquito killer, electronic igniter, and coin detector can be modified as a booster plate. The battery uses a three-section five-fifth 1800m Ah nickel-metal hydride battery, which can be directly exposed to the sun in the summer without sunlight. AC charging provides 4. 3V charging voltage, about 350mA charging current. If a three-section five-nickel cadmium battery is used, the current limiting resistor Ri should be changed to 8~iori to reduce the charging current and avoid damage to the battery.
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