|
Pull-up Resistors
In electronic logic circuits, a pull-up resistor (PU) or pull-down resistor (PD) is a resistor used to ensure a known state for a signal. More specifically, a pull-up resistor or pull-down resistor ensures that a wire will have a high logic level or low logic level, respectively, in the absence of a driving signal. It is typically used in combination with components such as switches and transistors, which physically interrupt the connection of subsequent components to ground or to VCC. A closed switch creates a direct connection to ground or VCC, but without a PU or PD, when the switch is open, the rest of the circuit would be left floating (i.e. it would have an indeterminate voltage), which is generally undesirable. For a switch that is used to connect a circuit to ground, a pull-up resistor (connected between the circuit and VCC) ensures a well-defined voltage (i.e. VCC) when the switch is open. For a switch that is used to connect a circuit to VCC (e.g. if the switch is u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pullup And Pulldown Resistors
A pull-up is an upper-body strength exercise. The pull-up is a Closed kinetic chain exercises, closed-chain movement where the body is suspended by the hands, gripping a bar or other implement at a distance typically wider than shoulder-width, and pulled up. As this happens, the elbows flexion, flex and the shoulders adduction, adduct and extension (anatomy), extend to bring the elbows to the torso. Pull-ups build up several muscles of the upper body, including the Latissimus dorsi muscle, latissimus dorsi, trapezius, and biceps brachii. A pull-up may be performed with overhand (pronated), underhand (supinated)—sometimes referred to as a chin-up—neutral, or rotating hand position. Pull-ups are used by some organizations as a component of fitness tests, and as a conditioning activity for some sports. Movement Beginning by hanging from the bar, the body is pulled up vertically. From the top position, the participant lowers their body until the arms and shoulders are fully ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transistor–transistor Logic
Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors (BJTs). Its name signifies that transistors perform both the logic function (the first "transistor") and the amplifying function (the second "transistor"), as opposed to earlier resistor–transistor logic (RTL) and diode–transistor logic (DTL). TTL integrated circuits (ICs) were widely used in applications such as computers, industrial controls, test equipment and instrumentation, consumer electronics, and synthesizers. After their introduction in integrated circuit form in 1963 by Sylvania Electric Products, TTL integrated circuits were manufactured by several semiconductor companies. The 7400 series by Texas Instruments became particularly popular. TTL manufacturers offered a wide range of logic gates, flip-flops, counters, and other circuits. Variations of the original TTL circuit design offered higher speed or lower power dissipation to allow design optimization. TTL devices w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electronic Circuits
An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow. It is a type of electrical circuit. For a circuit to be referred to as ''electronic'', rather than ''electrical'', generally at least one active component must be present. The combination of components and wires allows various simple and complex operations to be performed: signals can be amplified, computations can be performed, and data can be moved from one place to another. Circuits can be constructed of discrete components connected by individual pieces of wire, but today it is much more common to create interconnections by photolithographic techniques on a laminated substrate (a printed circuit board or PCB) and solder the components to these interconnections to create a finished circuit. In an integrated circuit or IC, the components and interconnections ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambridge University Press
Cambridge University Press was the university press of the University of Cambridge. Granted a letters patent by King Henry VIII in 1534, it was the oldest university press in the world. Cambridge University Press merged with Cambridge Assessment to form Cambridge University Press and Assessment under Queen Elizabeth II's approval in August 2021. With a global sales presence, publishing hubs, and offices in more than 40 countries, it published over 50,000 titles by authors from over 100 countries. Its publications include more than 420 academic journals, monographs, reference works, school and university textbooks, and English language teaching and learning publications. It also published Bibles, runs a bookshop in Cambridge, sells through Amazon, and has a conference venues business in Cambridge at the Pitt Building and the Sir Geoffrey Cass Sports and Social Centre. It also served as the King's Printer. Cambridge University Press, as part of the University of Cambridge, was a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Art Of Electronics
''The Art of Electronics'', by Paul Horowitz and Winfield Hill, is a popular electronics design reference textbook dealing with analog electronics, analog and digital electronics. The third edition was published in 2015. The author accepts reports of errata and posts them, to be corrected in future revisions. Overview The book covers many areas of circuit design, from basic Direct current, DC voltage, Electric current, current, and Electrical resistance, resistance, to active filters and oscillators, to digital electronics, including microprocessors and Digital data, digital Bus (computing), bus interfacing. It also includes discussions of such often-neglected areas as high-frequency, high-speed design techniques and low-Electric power, power applications. The book includes many example circuits. In addition to having examples of effective practices in circuit design, the book also demonstrates and explains common pitfalls in circuit design. It can be described as a cross betwe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winfield Hill
Winfield Hill is the Director of the Electronics Engineering Laboratory at the Rowland Institute at Harvard University. A self-proclaimed "electronics circuit-design guru" and trained physicist and electronic engineer, he co-authored the popular text ''The Art of Electronics'' with Harvard Physicist Paul Horowitz. Engineering work by Hill in the late 1970s at Harvard led him to found the Sea Data Corporation, which designed instruments for deep-sea oceanography Oceanography (), also known as oceanology, sea science, ocean science, and marine science, is the scientific study of the ocean, including its physics, chemistry, biology, and geology. It is an Earth science, which covers a wide range of to .... References #Winfield Hill's Electronics/Engineering Home Page External linksWinfield Hill The Rowland Institute at Harvard 21st-century American engineers Harvard University faculty Living people Year of birth missing (living people) Place of birth missing (livin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul Horowitz
Paul Horowitz (born 1942) is an United States of America, American physicist and electrical engineering, electrical engineer, known primarily for his work in electronics design, as well as for his role in the search for extraterrestrial intelligence (see SETI). Biography At age 8, Horowitz achieved distinction as the world's youngest amateur radio operator. He went on to study physics at Harvard University (Bachelor of Arts, A.B., 1965; Master's degree, A.M., 1967; Doctor of Philosophy, Ph.D., 1970), where he has also spent all of his subsequent career. His early work was on Scanning electron microscope, scanning microscopy (using both protons and X-rays). Horowitz has also conducted astrophysical research on pulsars and investigations in biophysics. His interest in practical electronics has led to a handful of inventions, including an automated voting machine and an acoustic mechanism for land mine, landmine detection, and an electronic Morse Code/Baudot code keyboard using a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Three-state Logic
In digital electronics, a tri-state or three-state buffer is a type of digital buffer that has three stable states: a high voltage output state (logical 1), a low output state (logical 0), and a high-impedance (Hi-Z) state. In the Hi-Z state, the output of the buffer is effectively disconnected from the subsequent circuit. Tri-state buffers are commonly used in bus-based systems where multiple devices are connected to the same shared bus, because the Hi-Z state allows other devices to drive the bus without interference from the tri-state buffer. For example, in a computer system, multiple devices such as the CPU, memory, and peripherals may be connected to the same data bus. To ensure that only one device can transmit data on the bus at a time, each device is equipped with a tri-state buffer. When a device wants to transmit data, it activates its tri-state buffer, which connects its output to the bus and allows it to transmit data. When the transmission is complete, the devic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ra (USB)
USB-C, or USB Type-C, is a 24-pin reversible connector (not a protocol) that supersedes previous USB connectors (also supersedes Mini DisplayPort and Lightning connectors) that can transfer data, e.g. audio/video data, to connect to monitors, external drives, mobile phones, keyboards/mouses, and many more peripheral devices; sometimes indirectly via hubs/docking stations. It also exchanges electricity, in general to power peripheral devices. It is used not only by USB technology, but also by other data transfer protocols, including Thunderbolt, PCIe, HDMI, DisplayPort, and others. It is extensible to support future protocols. The design for the USB-C connector was initially developed in 2012 by Intel, HP Inc., Microsoft, and the USB Implementers Forum. The Type-C Specification 1.0 was published by the USB Implementers Forum (USB-IF) on August 11, 2014. In July 2016, it was adopted by the IEC as "IEC 62680-1-3". The USB Type-C connector has 24 pins and is rever ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
