LEDs can charge a capacitor when light falls on them

Not only can LEDs emit light when current passes through them while forward biased, but they can be wired to act as mini solar cells. They will barely produce any power though. Just about enough to charge a small capacitor, or provide a weak light dependent signal.

Bright light on LEDs produces voltage and current demo for learning electronics shorts 74
Bright light on LEDs produces voltage and current demo for learning electronics shorts 74

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