Inside this Article 1. Introduction to How Camera Flashes Work 2. Making a Flash 3. The Boost 4. Oscillator and Capacitor 5. Lots More Information 6. See all Camera Basics articles Electronics Videos • More Electronic s Videos » The Boost In the last section, we saw that a flash circuit needs to turn a battery's low voltage into a high voltage in order to light up a xenon tube. There are dozens of ways to arrange this sort of step-up circuit, but most configurations contain the same basic elements. All of these components are explained in other HowStuffWorks articles: • Capacitors - Devices that store energy by collecting charge on plates (see How Capacitors Work ) • Inductors - Coiled lengths of wire that store up energy by generating magnetic fields (see How Inductors Work ) • Diodes - Semiconductor devices that let current flow freely in only one direction (see How Semiconductors Work ) • Transistors - Semiconductor devices that can act as electrically controlled switches or amplifiers (see How Amplifiers Work ) The diagram below shows how all of these elements come together in a basic flash circuit.
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