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Unformatted text preview: Lab 10. Light Sensitive Flash Camera Overview of this Session In this laboratory, you will learn: How to solder How to trigger a flash circuit in a disposable camera Introduction This lab is designed to teach you how to trigger the flash in a disposable camera with a light detecting circuit. When operating properly, the flash should go off every 7 seconds for as long as no light is getting into the IR detector. Background In lecture you learned that a transformer could be used to take a small AC signal and create a large one, or vice-versa. The Flash camera uses this property to create a large rectified AC signal to charge a capacitor to 320 volts. The energy from this cap is used to ignite the gas in the Xenon flash. Xenon is normally a good insulator, however when it is charged separately by another high voltage field it starts to become more of a conductor which then allows the field around it to be come grater, which in turn makes it even more of a conductor. This avalanche effect eventually brings the resistance down so low (to around 1 ohm)...
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- Spring '07