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Step 11Spooky Effect # 3 - Make Sound With Light
The 1N34A germanium diode in this crystal radio circuit is sensitive to light of all kinds. It responds to sunlight, light-bulbs, laser, flashlights, and even candlelight! The laser will work to activate sound from the radio from many feet away, but only when the laser light is actually moving across the light-sensitive diode.
Light-bulbs affect the radio diode from a couple of feet away, and the 60-cycle hum can be heard from them. The radio or light does not have to move to make sound in this case of AC power.
Candlelight must be close and moving to affect the diode, and then it is a very low frequency that is hard to catch. The AU Pitch control must be raised high to hear the low bass sound from the flame. See CandleSetup screenshot, below.
The use of various light sources to make sound is shown in the main movie.
Light-bulbs affect the radio diode from a couple of feet away, and the 60-cycle hum can be heard from them. The radio or light does not have to move to make sound in this case of AC power.
Candlelight must be close and moving to affect the diode, and then it is a very low frequency that is hard to catch. The AU Pitch control must be raised high to hear the low bass sound from the flame. See CandleSetup screenshot, below.
The use of various light sources to make sound is shown in the main movie.
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