I attached what appear to be LEDs (photodiodes?) to a pair of headphones and now I can hear lights that blink in the hearing range of frequencies 🤔 No power source needed

I’m not claiming that it’s ear-safe, and the sound is headache-inducing albeit quiet, but it’s pretty interesting.

For example, dimmable LED lighting flickers at around 1000 Hz. All my lamps make a different sound. Moving the “light microphone” through sunlight makes a wind-like sound.

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