fluorescent lamps driven by electronic ballast tutorial
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Capacitor plague
The capacitor plague (also known as bad capacitors) involved the common premature failure of certain brands of electrolytic capacitors used in various electronics equipment, and particularly in motherboards, video cards, compact fluorescent lamp ballasts, and power supplies of personal computers. The first flawed capacitors were seen in 1999, but most of the affected capacitors were made in the early to mid 2000s, and while news of their failures (usually after a few years of use) has forced most manufacturers to fix the defects, some bad capacitors are still being sold or integrated into designs as of early 2007[update].[1]
An incorrect electrolyte formula within a faulty capacitor causes the production of hydrogen gas, leading to bulging or deformation of the capacitor's case, and eventual venting of the electrolyte. In rare cases, faulty capacitors have even been reported to pop or explode forcefully. Although modern manufacturing techniques normally ensure they vent safely rather than explode, manufacturers have been known to omit the key safety features that allow this. (This has been a particular problem with the recent proliferation of "no name" brands from China.[citation needed] All of the components required for making electrolytic capacitors are available from specialist suppliers, but there is no guarantee that any particular manufacturer will actually make them properly).
A serious quality control problem is that good and poor quality electrolytic capacitors will often have identical electrical performance when newly fitted. Only extensive accelerated life testing involving abnormally high ripple currents and high operating temperatures can identify inferior components. This contrasts strongly with most electronic components which are much less subject to spontaneous failure after assembly.
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SAW-driven microfluidics - constant flow