LightControlled555Oscillator

1. Connect solar cell here. Increasing light will increase tone frequency. 2. With cell connected here, increasing light reduces volume from PZ. 3. Light falling on cell here reduces frequency or cuts off tone entirely. 4. Light striking cell here reduces volume from PZ or cuts off tone. 5. Light falling on cell here cuts off tone or causes chirps. 6. Light striking cell here reduces the tone frequency. 7. With cell here, increasing light increases tone frequency.