Radiation Noise Reduction Effect using Capacitor with
... Since the radiation noise from the electronic equipment is regulated in many countries, the effective techniques of radiated noise reduction is needed in the design and manufacturing fields of the equipment. It is well known that the radiated emission from the electronic equipment is often dominated ...
... Since the radiation noise from the electronic equipment is regulated in many countries, the effective techniques of radiated noise reduction is needed in the design and manufacturing fields of the equipment. It is well known that the radiated emission from the electronic equipment is often dominated ...
Teach Yourself Electricity and Electronics
... dense; matter is mostly empty space. Matter seems continuous because the particles are so small, and they move incredibly fast. Each chemical element has its own unique type of particle, known as its atom. Atoms of different elements are always different. The slightest change in an atom can make a t ...
... dense; matter is mostly empty space. Matter seems continuous because the particles are so small, and they move incredibly fast. Each chemical element has its own unique type of particle, known as its atom. Atoms of different elements are always different. The slightest change in an atom can make a t ...
Paper Title (use style: paper title)
... decouple. It is inconvenient to find problems with PCB when they are been made like many units and see that a percentage of them are failing due to excessive ripple. The moment to find out is as close to the beginning of the design process as possible, and the solution to determine this is with a pr ...
... decouple. It is inconvenient to find problems with PCB when they are been made like many units and see that a percentage of them are failing due to excessive ripple. The moment to find out is as close to the beginning of the design process as possible, and the solution to determine this is with a pr ...
Document
... • If the network contains independent and dependent sources, turn off the independent sources, leave the dependent sources intact, apply a test current source to the terminals and determine the resulting voltage at the terminals. The Thevenin/Norton resistance is RTH = VTest/ITest. Any Network (All ...
... • If the network contains independent and dependent sources, turn off the independent sources, leave the dependent sources intact, apply a test current source to the terminals and determine the resulting voltage at the terminals. The Thevenin/Norton resistance is RTH = VTest/ITest. Any Network (All ...
MFJ-259B HF/VHF SWR Analyzer
... band-pass filters behave like transmission lines of varying impedances on different frequencies. Low-pass or high-pass filters change impedance and SWR readings, just as an additional section of transmission line would. This modification of impedance caused by filters severely limits their usefulnes ...
... band-pass filters behave like transmission lines of varying impedances on different frequencies. Low-pass or high-pass filters change impedance and SWR readings, just as an additional section of transmission line would. This modification of impedance caused by filters severely limits their usefulnes ...
Crystal radio
A crystal radio receiver, also called a crystal set or cat's whisker receiver, is a very simple radio receiver, popular in the early days of radio. It needs no other power source but that received solely from the power of radio waves received by a wire antenna. It gets its name from its most important component, known as a crystal detector, originally made from a piece of crystalline mineral such as galena. This component is now called a diode.Crystal radios are the simplest type of radio receiver and can be made with a few inexpensive parts, such as a wire for an antenna, a coil of copper wire for adjustment, a capacitor, a crystal detector, and earphones. They are distinct from ordinary radios as they are passive receivers, while other radios use a separate source of electric power such as a battery or the mains power to amplify the weak radio signal so as to make it louder. Thus, crystal sets produce rather weak sound and must be listened to with sensitive earphones, and can only receive stations within a limited range.The rectifying property of crystals was discovered in 1874 by Karl Ferdinand Braun, and crystal detectors were developed and applied to radio receivers in 1904 by Jagadish Chandra Bose, G. W. Pickard and others.Crystal radios were the first widely used type of radio receiver, and the main type used during the wireless telegraphy era. Sold and homemade by the millions, the inexpensive and reliable crystal radio was a major driving force in the introduction of radio to the public, contributing to the development of radio as an entertainment medium around 1920.After about 1920, crystal sets were superseded by the first amplifying receivers, which used vacuum tubes (Audions), and became obsolete for commercial use. They, however, continued to be built by hobbyists, youth groups, and the Boy Scouts as a way of learning about the technology of radio. Today they are still sold as educational devices, and there are groups of enthusiasts devoted to their construction who hold competitions comparing the performance of their home-built designs.Crystal radios receive amplitude modulated (AM) signals, and can be designed to receive almost any radio frequency band, but most receive the AM broadcast band. A few receive shortwave bands, but strong signals are required. The first crystal sets received wireless telegraphy signals broadcast by spark-gap transmitters at frequencies as low as 20 kHz.