There is at least one piezoelectric element incorporated in the package or device and the piezoelectric element generates a source of voltage when it is activated.

存在被引入包装或器具中的至少一个压电元件，且压电元件在被 激活时产生电压源。

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Depending on the polarity of the voltage source, one of the two diodes (d) in parallel is used to reduce noise while the other provides a discharge path.

根据电压源的极性，互相并联的两个二极管(D)中的一个用来减小噪声，而另一个二极管则提供放电通路。

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That's not a problem, Kish says: transistors can be a good source of noise when operated at low voltage, and we can already fit billions of them on a chip.

这不是个问题，Kish表示：晶体管运作在低压时是噪音的良好来源，而我们已经可以在一个芯片上集成数十亿的晶体管了。

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Although the exact mechanism is still not entirely understood, it turns out that illuminating the liquid crystal, applying a voltage across a small region of it, and then turning off the light source causes a small amount of charge to be stored in that region.

ECONOMIST: Just press print