A clamper can mean:

  • A clamper, an electronic circuit.
  • A spiked plate worn on the sole of the shoe to prevent slipping when walking on ice.
  • A person who applies a wheel clamp to a vehicle parked illegally or on private land.
  • A person who belongs to the Ancient and Honorable Society of E Clampus Vitus.
Clamper (electronics)

A clamper is an electronic circuit that fixes either the positive or the negative peak excursions of a signal to a defined value by shifting its DC value. The clamper does not restrict the peak-to-peak excursion of the signal, it moves the whole signal up or down so as to place the peaks at the reference level. A diode clamp (a simple, common type) consists of a diode, which conducts electric current in only one direction and prevents the signal exceeding the reference value; and a capacitor, which provides a DC offset from the stored charge. The capacitor forms a time constant with the resistor load, which determines the range of frequencies over which the clamper will be effective.

Clipper (electronics)

In electronics, a clipper is a circuit designed to prevent a signal from exceeding a predetermined reference voltage level. A clipper does not distort the remaining part of the applied waveform. Clipping circuits are used to select, for purposes of transmission, that part of a signal waveform which lies above or below the predetermined reference voltage level.

Clipping may be achieved either at one level or two levels. A clipper circuit can remove certain portions of an arbitrary waveform near the positive or negative peaks or both. Clipping changes the shape of the waveform and alters its spectral components.

A clipping circuit consists of linear elements like resistors and non-linear elements like diodes or transistors, but it does not contain energy-storage elements like capacitors.

Clipping circuits are also called slicers or amplitude selectors.

Clipping (signal processing)

Clipping is a form of distortion that limits a signal once it exceeds a threshold. Clipping may occur when a signal is recorded by a sensor that has constraints on the range of data it can measure, it can occur when a signal is digitized, or it can occur any other time an analog or digital signal is transformed, particularly in the presence of gain or overshoot and undershoot.

Clipping may be described as hard, in cases where the signal is strictly limited at the threshold, producing a flat cutoff; or it may be described as soft, in cases where the clipped signal continues to follow the original at a reduced gain. Hard clipping results in many high frequency harmonics; soft clipping results in fewer higher order harmonics and intermodulation distortion components.


A diode is a two-terminal electronic component that conducts current primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance in one direction, and high (ideally infinite) resistance in the other. A diode vacuum tube or thermionic diode is a vacuum tube with two electrodes, a heated cathode and a plate, in which electrons can flow in only one direction, from cathode to plate. A semiconductor diode, the most commonly used type today, is a crystalline piece of semiconductor material with a p–n junction connected to two electrical terminals. Semiconductor diodes were the first semiconductor electronic devices. The discovery of asymmetric electrical conduction across the contact between a crystalline mineral and a metal was made by German physicist Ferdinand Braun in 1874. Today, most diodes are made of silicon, but other materials such as gallium arsenide and germanium are used.

Drake's Plate of Brass

The so-called Drake's Plate of Brass is a forgery that purports to be the brass plaque that Francis Drake posted upon landing in Northern California in 1579. The hoax was successful for 40 years, despite early doubts. After the plate came to public attention in 1936, historians raised questions regarding the plate's wording, spelling, and manufacture. The hoax's perpetrators attempted to apprise the plate's finders as to its origins. Many presumed the plate to be authentic after an early metallurgical study concluded it was genuine. In the late 1970s, scientists determined that the plate was a modern creation after it failed a battery of physical and chemical tests. Much of the mystery surrounding the plate continued until 2003, when historians advanced a theory about who created the plate and why, showing the plate to be a practical joke by local historians gone awry. The plate was acquired by – and is often on display at – the Bancroft Library of the University of California, Berkeley.

E Clampus Vitus

The Ancient and Honorable Order of E Clampus Vitus (ECV) is a fraternal organization dedicated to the preservation of the heritage of the American West, especially the history of the Mother Lode and gold mining regions of the area. There are chapters in California, Nevada, Arizona, Colorado, Utah, Washington, Idaho, Oregon, Montana and Outposts in other western states. Members call themselves "Clampers." The organization's name is in Dog Latin, and has no known meaning; even the spelling is disputed, sometimes appearing as "Clampus," "Clampsus," or "Clampsis." The motto of the Order, Credo Quia Absurdum, is generally interpreted as meaning "I believe it because it is absurd;" the proper Latin quotation Credo quia absurdum est, is from the Christian apologist Tertullian (c. 160–220), who rejected rationalism and accepted a Gospel which addressed itself to the "non-rational levels of perception."


Haworth () is a village in City of Bradford, West Yorkshire, England, in the Pennines 3 miles (5 km) southwest of Keighley, 10 miles (16 km) west of Bradford and 10 miles (16 km) east of Colne in Lancashire. The surrounding areas include Oakworth and Oxenhope. Nearby villages include Cross Roads, Stanbury and Lumbfoot.

Haworth is a tourist destination known for its association with the Brontë sisters and the preserved heritage Keighley and Worth Valley Railway.

Index of physics articles (C)

The index of physics articles is split into multiple pages due to its size.

To navigate by individual letter use the table of contents below.

John Flint Kidder

John Flint Kidder (1830 - April 10, 1901) was a politician, civil engineer and railroad executive who built and later owned Northern California's Nevada County Narrow Gauge Railroad (NCNGRR) which, during its operation, never experienced an attempted robbery.

List of Storage Wars episodes

This is a list of Storage Wars episodes that have aired on the A&E network over the course of its run. A twelfth season began airing November 7th, 2018.

Operational amplifier

An operational amplifier (often op-amp or opamp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. In this configuration, an op-amp produces an output potential (relative to circuit ground) that is typically hundreds of thousands of times larger than the potential difference between its input terminals.

Operational amplifiers had their origins in analog computers, where they were used to perform mathematical operations in many linear, non-linear, and frequency-dependent circuits.

The popularity of the op-amp as a building block in analog circuits is due to its versatility. By using negative feedback, the characteristics of an op-amp circuit, its gain, input and output impedance, bandwidth etc. are determined by external components and have little dependence on temperature coefficients or engineering tolerance in the op-amp itself.

Op-amps are among the most widely used electronic devices today, being used in a vast array of consumer, industrial, and scientific devices. Many standard IC op-amps cost only a few cents in moderate production volume; however, some integrated or hybrid operational amplifiers with special performance specifications may cost over US$100 in small quantities. Op-amps may be packaged as components or used as elements of more complex integrated circuits.

The op-amp is one type of differential amplifier. Other types of differential amplifier include the fully differential amplifier (similar to the op-amp, but with two outputs), the instrumentation amplifier (usually built from three op-amps), the isolation amplifier (similar to the instrumentation amplifier, but with tolerance to common-mode voltages that would destroy an ordinary op-amp), and negative-feedback amplifier (usually built from one or more op-amps and a resistive feedback network).

Perrier's Bounty

Perrier's Bounty is a 2009 Irish black comedy crime film set in modern-day Dublin. Described as an "urban western" by its director Ian Fitzgibbon, it stars Brendan Gleeson as the villainous title character, as well as Cillian Murphy and Jim Broadbent as son and father.

Filming was completed in late January 2009, and the film premiered at the 2009 Toronto International Film Festival. It was released in the United Kingdom and Ireland on 26 March 2010.

Power amplifier classes

Power amplifier classes are, in electronics, letter symbols applied to different power amplifier types. The class gives a broad indication of an amplifer's characteristics and performance. The classes are related to the time period that the active amplifier device is passing current, expressed as a fraction of the period of a signal waveform applied to the input. A class A amplifier is conducting through all the period of the signal; Class B only for one-half the input period, class C for much less than half the input period. A Class D amplifier operates its output device in a switching manner; the fraction of the time that the device is conducting is adjusted so a pulse width modulation output is obtained from the stage.

Additional letter classes are defined for special purpose amplifiers, with additional active elements or particular power supply improvements; sometimes a new letter symbol is used by a manufacturer to promote its proprietary design.

Robot combat

Robot combat is a form of robot competition in which two or more custom-built machines use varied methods of destroying or disabling the other. The machines are generally remote-controlled vehicles rather than autonomous robots, though not exclusively.

Robot combat competitions have been made into television series, including Battlebots in the US and Robot Wars in the UK. These shows were originally broadcast in the late 1990s to early 2000s and experienced revivals in the mid-2010s. As well as televised competitions, smaller robot combat events are staged for live audiences such as those organised by the Robot Fighting League.

Robot builders are generally hobbyists and the complexity and cost of their machines can vary substantially. Robot combat uses weight classes, with the heaviest robots able to exert more power and destructive capabilities. The rules of competitions are designed for safety of the builders, operators, and spectators while also providing for an entertaining spectacle. Robot combat arenas are generally surrounded by a bulletproof screen.

Competitor robots come in a variety of designs, with different strategies for winning fights. Robot designs typically incorporate weapons for attacking opponents, such as axes, hammers, flippers and spinning devices. Rules almost always prohibit gun-like weapons as well as other strategies not conducive to the safety and enjoyment of participants and spectators.

Sarah Kidder

Sarah Clark Kidder (var. Sara) (c.1839 - September 1933) was president of Northern California's Nevada County Narrow Gauge Railroad (NCNGRR) from 1901 to 1913. She was the first female railroad president in the world.

Swift Berry

Jack Swift Berry (January 9, 1887 – June 27, 1967), known as Swift Berry, was a forestry expert and lumberman and then two-term member of the California State Legislature from the Republican Party.

The Pleasure Principle (film)

The Pleasure Principle is a 1992 British comedy film directed by David Cohen and starring Peter Firth, Haydn Gwynne and Lysette Anthony. The screenplay concerns a modern-day Don Juan who enjoys relationships with several different women, but is still bemused by the mysteries of the opposite sex.

Vine v London Borough of Waltham Forest

Vine v London Borough of Waltham Forest was a case heard at the Court of Appeal of England and Wales in 2000 and set new case law with regard to the use of wheel clamps by establishing a legal precedent in relation to the concept of consent by expanding upon the decision in the case of Arthur & Another v Anker & Another [1996] 3 AER 783.

Wheel clamp

A wheel clamp, also known as wheel boot, parking boot, or Denver boot, is a device that is designed to prevent motor vehicles from being moved. In its most common form, it consists of a clamp that surrounds a vehicle wheel, designed to prevent removal of both itself and the wheel.

In the United States, the device became known as a "Denver boot" after the city of Denver, Colorado, which was the first place in the country to employ them, mostly to force the payment of outstanding parking tickets.While primarily associated with law enforcement and parking violations, a variety of wheel clamps are now available to consumers as theft deterrent devices for personal use as an alternative to the steering-wheel lock.


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