NEGATIVE RESISTANCE CHARACTERISTICS AND USES OF
... requirements gave them many advantages over the bulky vacuum tube. Their use lapsed, however, until the urgent requirements of radar brought them forward once more. Although new types of crystal diodes have been developed, most of the basic applications are the same. ...
... requirements gave them many advantages over the bulky vacuum tube. Their use lapsed, however, until the urgent requirements of radar brought them forward once more. Although new types of crystal diodes have been developed, most of the basic applications are the same. ...
Question Bank ECOM - Noble Group of Institutions Junagadh
... 5. Define signal to noise ratio and noise figure of a receiver. When might the latter be a more suitable piece of information than the equivalent noise resistance? 6. The RF amplifier of a receiver has an input resistance of 800 _, and equivalent shot noise resistance of 1800 _, a gain of 20, and a ...
... 5. Define signal to noise ratio and noise figure of a receiver. When might the latter be a more suitable piece of information than the equivalent noise resistance? 6. The RF amplifier of a receiver has an input resistance of 800 _, and equivalent shot noise resistance of 1800 _, a gain of 20, and a ...
BITX40 with Raduino - tips and mods
... input , I changed the 6.8 k to 10 k and it still works on the bench hooked up to the BITX. The circuit is stupidly simple and seems very stable. I just installed the key in series with the sine wave output to the mic connection . Going to install a DPDT switch to disconnect mike and connect audio ge ...
... input , I changed the 6.8 k to 10 k and it still works on the bench hooked up to the BITX. The circuit is stupidly simple and seems very stable. I just installed the key in series with the sine wave output to the mic connection . Going to install a DPDT switch to disconnect mike and connect audio ge ...
AIC-6 AC Circuit Tools NI ELVIS
... a 2-D plot as a line along the X axis often called the real component. For a capacitor, the impedance (or more specifically, the reactance) XC is imaginary, depends on frequency and can be represented as a line along the Y axis of a 2-D plot. It is called the imaginary component. Mathematically, the ...
... a 2-D plot as a line along the X axis often called the real component. For a capacitor, the impedance (or more specifically, the reactance) XC is imaginary, depends on frequency and can be represented as a line along the Y axis of a 2-D plot. It is called the imaginary component. Mathematically, the ...
Appendix of Basic Chemistry and Physics
... Q is a measure of probe performance. Higher Q means a more sensitive probe (it produces higher signal-to-noise), so NMR engineers try to make R as small as possible and L as large as possible. However, there are limits on L imposed by the equation (2πf)2LC2 = 1 and the choice of variable capacitors ...
... Q is a measure of probe performance. Higher Q means a more sensitive probe (it produces higher signal-to-noise), so NMR engineers try to make R as small as possible and L as large as possible. However, there are limits on L imposed by the equation (2πf)2LC2 = 1 and the choice of variable capacitors ...
Diodes
... electrical device that has a very high resistance to the flow of electrical current in t absence of light. • When light strikes the device, it lowers its resistance, allowing electrical current to flow through it and on to other devices or electrical circuits. ...
... electrical device that has a very high resistance to the flow of electrical current in t absence of light. • When light strikes the device, it lowers its resistance, allowing electrical current to flow through it and on to other devices or electrical circuits. ...
manual
... Last week you looked at the behavior of a capacitor in a DC circuit. Briefly, at the end, you looked at how the voltage across the capacitor changed as a function of the frequency in an AC circuit. This week you will look at AC circuits in more detail. Consider what happens in a series circuit consi ...
... Last week you looked at the behavior of a capacitor in a DC circuit. Briefly, at the end, you looked at how the voltage across the capacitor changed as a function of the frequency in an AC circuit. This week you will look at AC circuits in more detail. Consider what happens in a series circuit consi ...
Understanding Quartz Crystals
... volts and is properly optimized, it is unlikely that any drive problems should be experienced. Drive level is more critical when using tuning fork crystals such as the M-tron MMCC-1, MMCC2, and the SX 1555. These crystals are usually rated at 1 µW maximum drive. Circuits using these types of crystal ...
... volts and is properly optimized, it is unlikely that any drive problems should be experienced. Drive level is more critical when using tuning fork crystals such as the M-tron MMCC-1, MMCC2, and the SX 1555. These crystals are usually rated at 1 µW maximum drive. Circuits using these types of crystal ...
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.