New simple multi-range capacitance meter circuit
As shown in the figure, the capacitor measurement circuit can measure the capacitance within 1uF and is divided into 5 ranges: 100pF, 1000pF, 0.01uF, 0.1uF and 1uF. The lower transition edge of the output pulse of ICa in the circuit passes Cs, Rs. After the differentiation, the average voltage or current of the ICb.Icb output is proportional to Cx, and the average current will be indicated by the meter. W1 is used to adjust the full scale, Cx is connected to the 1uF or 0.1uF standard capacity capacitor, and W1 is adjusted to make the meter indicate the full scale value. W2~W4 are zero-regulating resistors, because the influence of the 7556 output DC offset voltage on each range is slightly different, so it is zeroed separately.
Explosion-proof Screen Protector
The Explosion-proof Screen Protective Film for mobile phones is a protective film that can effectively buffer the impact, prevent the screen from bursting, or prevent the glass panel from being broken and scattered due to accidental impact of the mobile phone. Screen protector with gloss, texture and surface hardness.
The Protective Film is made of imported materials from Korea. It is equipped with a proprietary "self-healing" function that can automatically repair minor scratches on the film. Daily protection measures to prevent accidental knocks and drops. The screen strengthens the screen and reduces the chance of cracking. Broken tempered glass is no longer replaced frequently.
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Shenzhen Jianjiantong Technology Co., Ltd. , https://www.jonsun-sz.com