Sliding noise rated working voltage

When the brush slides on the resistor, the voltage between the center end of the potentiometer and the fixed end has irregular fluctuations. This fluctuation is called the sliding noise of the potentiometer. It is caused by the uneven distribution of the resistivity of the material and the electric Irregular changes in contact resistance when the brush slides.

Rated working voltage

Rated working voltage refers to the highest working voltage allowed by the potentiometer under the specified conditions. The actual working voltage of the potentiometer should be less than the rated voltage.


Resolution refers to the ratio of the change in resistance to the output voltage when the resistance of the potentiometer changes continuously. The resolution of the non-wire wound potentiometer is higher than that of the wire wound potentiometer.

Dynamic noise

Dynamic noise refers to the electrical noise generated when the potentiometer’s moving contact slides on the resistor under the action of an applied voltage. The magnitude of this noise is related to the speed of the shaft, the contact resistance between the contact point and the resistor, the number of moving contacts, the uneven change in the resistivity of the resistor, and the magnitude of the applied voltage.

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Semiconductor and Texas Instruments

Investors interested in the semiconductor industry often find themselves weighing the interests of Texas Instruments (NASDAQ: TXN) and NXp Semiconductors (NASDAQ: NXpI). The two huge chip manufacturers have a lot in common, there is fierce competition in several key markets, and they run very similar hybrid manufacturing models. So, which is a better investment now?

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Once upon a time, the main determinant of these two stocks was their valuation. Last spring, NXp ’s trading price was a bargaining ratio of 10 times forward earnings, which made it a unique investment strategy. At the time, Texas Instruments (TI) stock was changing hands at 20 times forward earnings. For p / E purists, there is no reason to consider TI as NXp.

Since then, the situation has changed, but perhaps the rules of the game have not changed. NXp investors achieved a 74% return in 2019, while TI shareholders had to settle with 36% (still market leading) earnings. Today, NXp stocks have a price-to-earnings ratio of 15 times and free cash flow of 24 times, while Texas Instruments’ (TI) valuation ratio is 26 times forward earnings and 39 times free cash flow.

Therefore, NXp does seem to be worth the money right now, but that is not all. The chief investor Warren Buffett famously favored buying large companies at a reasonable price rather than buying fair companies at high prices. This is a wonderful way to think about the important issues of serious investors.

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