Light Control Sound Circuit
This circuit changes the intervals between each sound according to the amount of light falling on the CdS cell. The sound changes continuously as you adjust the light intensity.
Set the switch to position ON to turn on the power after you complete the wiring. The speaker immediately makes a sound. Move your hand over the CdS to change the sound.
You can calculate the approximate value of the frequency of the signal by using the equation 1/2 χ C1 χ R1. However, R1, in this project, is the CdS and is not constant. You can change the value of the output frequency by changing C1.
In this experiment, the speaker is equipped with a buffer so that the light control sound circuit is not affected when the speaker emits sounds.