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LECT7V23
LECT7V23

... Common Emitter Amplifier - Input at base, output at collector, voltage gain (inverts), current gain. Common Collector Amplifier - Input at base, output at emitter, current gain, voltage gain equal to one (aka the Emitter Follower). Common Base Amplifier - Input at emitter, output at collector, volta ...
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... Figure 3 shows a 5 V- only transmit/receive telephone line interface for a modem circuit. It allows full duplex transmission of modem signals on a transformer-coupled 600 V line in a differential manner. The transmit section gain can be set for the specific modem device output. Similarly the receive ...
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... factor 50 and appearance is the same as 211 or 845 • 673V/110mA(no signal) at plate, +26.6V grid bias to increase to 120mA by maximum exciting signal of 74.5V rms, 35W output (THD:3%) in A2 class operation • Grid current varies 11mA~21.5mA • A (5998A) unit used for CF plate current is 52mA (nosignal ...
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Amplifier



An amplifier, electronic amplifier or (informally) amp is an electronic device that increases the power of a signal.It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In this sense, an amplifier modulates the output of the power supply to make the output signal stronger than the input signal. An amplifier is effectively the opposite of an attenuator: while an amplifier provides gain, an attenuator provides loss.An amplifier can either be a separate piece of equipment or an electrical circuit within another device. The ability to amplify is fundamental to modern electronics, and amplifiers are extremely widely used in almost all electronic equipment. The types of amplifiers can be categorized in different ways. One is by the frequency of the electronic signal being amplified; audio amplifiers amplify signals in the audio (sound) range of less than 20 kHz, RF amplifiers amplify frequencies in the radio frequency range between 20 kHz and 300 GHz. Another is which quantity, voltage or current is being amplified; amplifiers can be divided into voltage amplifiers, current amplifiers, transconductance amplifiers, and transresistance amplifiers. A further distinction is whether the output is a linear or nonlinear representation of the input. Amplifiers can also be categorized by their physical placement in the signal chain.The first practical electronic device that amplified was the Audion (triode) vacuum tube, invented in 1906 by Lee De Forest, which led to the first amplifiers. The terms ""amplifier"" and ""amplification"" (from the Latin amplificare, 'to enlarge or expand') were first used for this new capability around 1915 when triodes became widespread. For the next 50 years, vacuum tubes were the only devices that could amplify. All amplifiers used them until the 1960s, when transistors appeared. Most amplifiers today use transistors, though tube amplifiers are still produced.
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