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Key Points for the Use of Phone Jacks

1. In cases where data transmission through the headphone jack is particularly fast, the contact resistance of the jack can change significantly, leading to a reduction in the operating voltage of the device and voltage instability. Therefore, it is crucial to pay extra attention to the safe use of the headphone jack.

2. The choice between mechanical lifespan and electrical lifespan of the headphone jack should be based on the application scenario. In situations where the headphone jack is frequently plugged and unplugged and operates under heavy load, priority should be given to its mechanical lifespan when selecting the jack.

3. When using a headphone jack, the rated current value of the jack should be chosen according to the nature of the load. This is because the starting current can be very high when the headphone jack is operating. If the selected headphone jack cannot withstand the impact of the starting current within the required time, arcing will occur at the contact points of the jack, potentially leading to welding of the contact points or damage to the jack due to arc splashing.

4. During the use of a headphone jack, if the internal copper contacts are poor, it can lead to excessive current in the circuit before the line, causing overheating. Low-quality headphone jacks are generally prone to burning out or even causing fires. Therefore, it is important to choose high-quality jacks when selecting headphone jacks.

5. The voltage applied to the headphone jack in a circuit must be less than the rated voltage of the jack to prevent damage to the jack due to overvoltage.

6. Since the quality of the internal metal contact points' engagement directly affects the circuit load when the headphone jack is connected, it is advisable to select a headphone jack with low contact resistance. For applications in low-power circuits, a headphone jack with internal metal contacts can be chosen.
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