Circuit Sums with ac
... Circuit Sums with a.c. If the circuit only contains resistances (as well as generators of voltage), the calculations work just like d.c. Fortunately, in the domestic situation, such circuits are, near enough, the norm. Complications arise if the circuit includes Inductance and/or Capacitance, both o ...
... Circuit Sums with a.c. If the circuit only contains resistances (as well as generators of voltage), the calculations work just like d.c. Fortunately, in the domestic situation, such circuits are, near enough, the norm. Complications arise if the circuit includes Inductance and/or Capacitance, both o ...
Chapter 3: From lumped to distributed elements
... Directivity = P3/P4 = I-C, ability to isolate forward and backward waves 90° all limited bandwidth 180° Transformer 180° hybrid is not resonant, so it’s broadband Transformers Autotransformer (tapped coil) vs. Conventional transformer ...
... Directivity = P3/P4 = I-C, ability to isolate forward and backward waves 90° all limited bandwidth 180° Transformer 180° hybrid is not resonant, so it’s broadband Transformers Autotransformer (tapped coil) vs. Conventional transformer ...
Tute 2 PDF document
... 01) An inductor of self-inductance 300 mH and resistance 5 is connected to a battery of negligible internal resistance. Calculate the time in which the current will attain half its final steady value. 02) The charge on a perfect capacitor of capacitance 2 F falls to 50% of its value in 6 minutes, ...
... 01) An inductor of self-inductance 300 mH and resistance 5 is connected to a battery of negligible internal resistance. Calculate the time in which the current will attain half its final steady value. 02) The charge on a perfect capacitor of capacitance 2 F falls to 50% of its value in 6 minutes, ...
RC and RL circuits. Given the following circuit with Vin = 10V sin(ωt
... b). Find an expression for the frequency at which the capacitive reactance and the inductive reactance are of equal magnitude. [6 points] c). How does the impedance of the circuit at this frequency compare with the impedance at smaller and greater frequencies? Support your answer with mathematics. [ ...
... b). Find an expression for the frequency at which the capacitive reactance and the inductive reactance are of equal magnitude. [6 points] c). How does the impedance of the circuit at this frequency compare with the impedance at smaller and greater frequencies? Support your answer with mathematics. [ ...
HQ-170 Manual
... will not be very noticeable unless the proper procedure is employed. The suggested procedure is as follows: Tune in an AM signal on any band or any other strong constant carrier of similar nature, such as crystal calibrator. Whenever the receiver is being tuned for normal reception be sure to first ...
... will not be very noticeable unless the proper procedure is employed. The suggested procedure is as follows: Tune in an AM signal on any band or any other strong constant carrier of similar nature, such as crystal calibrator. Whenever the receiver is being tuned for normal reception be sure to first ...
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.