DGES Amateur Radio Club Communications Field Day # 2
... but all contain at least two electrical conductors separated by a dielectric (insulator); for example, one common construction consists of metal foils separated by a thin layer of insulating film. Capacitors are widely used as parts of electrical circuits in many common electrical devices. ...
... but all contain at least two electrical conductors separated by a dielectric (insulator); for example, one common construction consists of metal foils separated by a thin layer of insulating film. Capacitors are widely used as parts of electrical circuits in many common electrical devices. ...
Em05: Series-Resonant LCR Circuit
... In this experiment my aim was to plot resonance curves and determine the circuit magnification factor for various resistances. To do this I set up a series circuit containing a capacitor, an inductor and a resistor. These instruments were connected to a signal generator and the circuit was used to p ...
... In this experiment my aim was to plot resonance curves and determine the circuit magnification factor for various resistances. To do this I set up a series circuit containing a capacitor, an inductor and a resistor. These instruments were connected to a signal generator and the circuit was used to p ...
Wein Bridge Oscillators
... update the circuit using a form of amplitude stabilization. There are a couple of available design methods, but one of the better schemes involves the introduction diodes into the circuit. Along with the diodes, two additional resistors are added to form an amplitude control network. The schematic f ...
... update the circuit using a form of amplitude stabilization. There are a couple of available design methods, but one of the better schemes involves the introduction diodes into the circuit. Along with the diodes, two additional resistors are added to form an amplitude control network. The schematic f ...
Ch14
... • The quality factor is the ratio of its resonant frequency to its bandwidth. • If the bandwidth is narrow, the quality factor of the resonant circuit must be high. • If the band of frequencies is wide, the quality factor must be low. ...
... • The quality factor is the ratio of its resonant frequency to its bandwidth. • If the bandwidth is narrow, the quality factor of the resonant circuit must be high. • If the band of frequencies is wide, the quality factor must be low. ...
EXPERIMENT 1
... until the voltage across the capacitor stabilizes at 0 V. (Note that if the capacitor has been charged before, a wire temporarily shorting out the capacitor will speed up this process. Do not use your bare hands) ...
... until the voltage across the capacitor stabilizes at 0 V. (Note that if the capacitor has been charged before, a wire temporarily shorting out the capacitor will speed up this process. Do not use your bare hands) ...
MODEL EXAM
... 10∟20˚A. Find the value of three line currents. List out the methods of power measurement in the 3 φ balanced circuits. PART B ...
... 10∟20˚A. Find the value of three line currents. List out the methods of power measurement in the 3 φ balanced circuits. PART B ...
Building virtual circuit worksheet
... Building virtual circuits http://www.cleo.net.uk/consultants_resources/science/circuitWorld/index.html ...
... Building virtual circuits http://www.cleo.net.uk/consultants_resources/science/circuitWorld/index.html ...
Relay Basics - UNLV Physics
... Check the relay datasheet for the expected lifetime (i.e. # of times it can open and close before failure). If the relay won't be used much (say to control the headlights on a car) a 20,000 cycle lifetime would last about 18 years if used three times a day. If the same relay was used to control a ho ...
... Check the relay datasheet for the expected lifetime (i.e. # of times it can open and close before failure). If the relay won't be used much (say to control the headlights on a car) a 20,000 cycle lifetime would last about 18 years if used three times a day. If the same relay was used to control a ho ...
PHYS 3322 Modern Laboratory Methods 1 Theory 1
... In this expression, ϕ is the phase between the applied voltage and the current in the circuit. When performing the analysis of electrical circuits in order to determine the phase and total impedance, the technique is the same if the trigonometric (real) expressions are used or if the complex express ...
... In this expression, ϕ is the phase between the applied voltage and the current in the circuit. When performing the analysis of electrical circuits in order to determine the phase and total impedance, the technique is the same if the trigonometric (real) expressions are used or if the complex express ...
Chapter
... a coil is sensitive to the point of operation on the hysteresis curve If a coil is operating on the steep slope, the change in flux will be relatively high for a change in current through the coil If the coil is operating near or in saturation, the change in flux will be relatively small for the s ...
... a coil is sensitive to the point of operation on the hysteresis curve If a coil is operating on the steep slope, the change in flux will be relatively high for a change in current through the coil If the coil is operating near or in saturation, the change in flux will be relatively small for the s ...
Lecture 2 Review • Methods of Analysis —Nodal analysis —Mesh analysis
... Replacing a voltage source vs in series with a resistor R by a current source is in parallel with a resistor R, or vice versa. ...
... Replacing a voltage source vs in series with a resistor R by a current source is in parallel with a resistor R, or vice versa. ...
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.