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1. Use a soft wire or other hard metal (such as a rod antenna) for the antenna, with a length of about 20cm (315MHz) or 18cm (434MHz). Try to straighten it for use. Do not get close to metal obje...[Details]
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On the morning of June 2, Apple released a new annual fraud prevention analysis report. The data showed that in 2021, the Apple App Store prevented 1.6 million high-risk, untrustworthy apps fro...[Details]
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Abstract Aiming at the inconvenience of electricity consumption and charging management in various places, this paper studies the remote electric parameter measurement technology based on ARM and Eth...[Details]
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0 Introduction［1］
Traditionally, permanent magnet synchronous motors with trapezoidal wave back EMF are called brushless DC motors. Torque control of brushless DC motors requires rotor positio...[Details]
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On May 17, BusinessKorea reported that Qualcomm was listed as one of Samsung Electronics' top five corporate customers in the first quarter of 2022. Qualcomm was selected because it signed a large fo...[Details]
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Jiwei.com reported (Reporter Zhang Yiqun) Today, the "2021 World Ultra-High Definition Video (4K/8K) Industry Development Conference Press Conference" was held in Beijing. Ren Aiguang, Deputy Directo...[Details]
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the problem we are facing:
The electronic device is a wireless communication device dedicated to the 300MHz frequency band. There is no problem with EMC certification, but the device itself does not ...[Details]
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1. Introduction
Arranging as many microwave antennas as possible in the smallest possible space requires very strict requirements on the mutual interference between antennas, and also places high...[Details]
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For power supplies for analog signal circuits such as audio amplifiers, linear regulated power supplies have less interference and have a greater advantage over switching power supplies. The circui...[Details]
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1. Principle When the fluid flow sensor along the axial direction enters the product, it is forced to rotate around the center line under the action of the vortex generator, generating a vortex flow....[Details]
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The balanced orifice flowmeter is a new type of flowmeter that has been developed recently. Based on the standard orifice plate, it adopts a four-hole flow method, which greatly avoids the shortcoming...[Details]
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What precautions should be taken when testing LEDs with a multimeter? LED (Light Emitting Diode) is a semiconductor diode (a pn junction) that emits light when positive current flows from the LED an...[Details]
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According to statistics, there are more than 270 million patients with hypertension in my country, and 40% of them do not know that they have hypertension. In order to effectively control hypertensio...[Details]
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China is the world's largest new energy vehicle market, and the future of domestic power semiconductors is promising. In the first half of 2022, China's new energy passenger vehicles accounted for ...[Details]
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On November 14, Qualcomm announced the launch of two connectivity modules, QCC74xM and QCC730M, for IoT applications such as smart homes and smart appliances. These two modules are now available fo...[Details]
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