Any light source does not burn evenly, but flickers. In some cases, we see this flicker, in others its frequency goes beyond the perception of the human eye. Human, because the eye of an animal or bird perceives a different range of flicker. Is it possible to hear this flicker? In order to hear the light, it is necessary to convert it into electric current and, through the audio amplifier, apply to the speaker.
So, to “wiretap” the light, you need the following parts: an audio amplifier, mono or audio cable, a solar light panel, a plastic cap from a bubble, soldering accessories, epoxy glue, paint, wires.
The circuit of such a device is simple. If you have a stereo wire, then solder + the solar light panel to the tip of the connector, and short-circuit the rings and solder to the - panel. The same goes for mono conductor except shorting.
Now about the solar panel. If you have a small solar panel, you can use it. The author had fragments from the solar panel, and had to tinker to make a workable part. First, he cut out two circles from an unnecessary board, with holes in the center. Installed in a drilling machine and processed to the desired size (slightly less than the diameter of the cap).
I glued a piece of the solar panel to the mug. I drilled a hole in the cap. He pulled the cable through the hole, soldered the ends to the panel. The light detector is ready.
I glued the light panel inside the cap, and the cap itself painted black.
A multimeter checks the operability of the panel.
The panel works and now you need to connect the audio jack to the amplifier and bring the light receiver to the light source.
Now a few examples recorded by the author, and do not be surprised:
Perhaps you thought it was a joke? No, LED candles (photo below) "shine with just that sound", if I may say so)))
The author suggests that the same microcircuits are used for some musical products and such LED candles.This gives such an interesting effect.