because i used a really small amount of current. (48mA). when it flow through voltage regulator, the current also regulate into a small value. then, it is not enough current to flow into usb socket or to phone.
it is because:
usb socket need 500mA at least to connect the charger & some phone need at least 120mAh before they will start charge phone
then, i need to use a larger of current for solar panel.
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