An external power supply is required, this external power supply provides a higher than expected test voltage above the Zener. The potentiometer RV1 will be adjusted until the meter reading is stable. This reading is the breakdown voltage of the Zener.
Heated Mouse Mat is a mouse pad with heating function. It can provide a warm surface by connecting to a power source or USB port, making users feel more comfortable and warm when using the mouse in a cold environment. This kind of mouse pad is usually made of soft material, has a comfortable touch, and also has anti-slip properties, which can effectively fix the mouse and improve the stability of operation. Heated Mouse Mat is suitable for users who use computers for a long time, especially in winter or in air-conditioned rooms. It can effectively relieve cold hands and improve work efficiency and comfort.
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