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Topic: Power amplifier

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	Amplifier -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-08-08)
		An amplifier is a (An instrumentality invented for a particular purpose) device that uses a small amount of energy to control a larger amount.
		Amplifiers are typically utilized over a specific range of frequencies and are generally of maximal utility if the gain is constant in that range.
		There are also mechanical amplifiers, such as the automotive (Control system that converts a small mechanical motion into one requiring much greater power; may include a negative feedback system) servo used in (additional info and facts about braking) braking.
	www.absoluteastronomy.com /encyclopedia/a/am/amplifier.htm (246 words)

	Amplifier Efficiency
		Amplifier efficiency is a topic that seems to be poorly understood, judging from the comments and questions I have had from readers, so I thought that I would put something together to explain away some of the mystery.
		As power is reduced, efficiency is also reduced, and output device dissipation increases until a critical point is reached, after which it again falls with falling output power.
		This is power that is needed to maintain the magnetic flux in the transformer core, and is always present.
	sound.westhost.com /efficiency.htm (2876 words)

	Articles - Electronic amplifier (Site not responding. Last check: 2007-08-08)
		Amplifier circuits are classified as A, B, AB and C for analogue designs, and class D and E for switching designs.
		In an analogue amplifier, the signal is applied to the input terminal of the device (base, gate or grid), and this causes a current to flow in proportion to the input between the output terminal and ground (collector, drain or anode).
		In a Class A circuit, the amplifying element is biased such that the device is always conducting to some extent, and is operated over the most linear portion of its characteristic curve (known as its transfer function or transconductance curve).
	www.zgrey.com /articles/Electronic_amplifier (3097 words)

	Power Amplifier Fundamental (Site not responding. Last check: 2007-08-08)
		The purpose of a power amplifier, in very simple terms, is to take a signal from a source device (in a DJ system the signal typically comes from a preamplifier or signal processor) and make it suitable for driving a loudspeaker.
		Power amplifiers get the necessary energy for amplification of input signals from the AC wall outlet to which they are plugged into.
		Power Supply: The primary purpose of a power supply in a power amplifier is to take the 120 VAC power from the outlet and convert it to a DC voltage (VAC is an abbreviation forVolts Alternating Current, and DC is an abbreviation forDirect Current).
	www.rocketroberts.com /techart/amp.htm (9018 words)

	Power Amplifier
		The error current is amplified as the relation given by R7/R19 (and R8/R20), and is transformed to a proportional voltage in the summing point before the current amplifier.
		Higher power output is thus achieved without higher power dissipation worth mentioning (for an equal value of the power supply voltage to the current amplifier).
		The output power of this amplifier may be increased to 50 W RMS in class A. The cooling requirement, however, is large and should not be underestimated.
	home.no.net /andiha/articles/audio/powamp.htm (1965 words)

	The Public Address 400W Power Amplifier - "Gelicon-400" (Site not responding. Last check: 2007-08-08)
		All inputs and outputs of power amplifiers are symmetric and has special voice filters for the best quality of voice signals, minimize the crosstalking and noise background.
		Besides, power amplifiers has circuitry to protect loudspeakers from an overload by low-frequency components of a signal.
		In the failure of amplifiers or their malfunction within a warranty period the manufacturer provide after-sales service including free charge replacement or repairing, and also makes delivery of components to amplifiers after a warranty period.
	home.graffiti.net /gelicon (424 words)

	Kenwood power amplifier
		But since amplifiers can be sensitive to electrical and motor noise and because interference from the amplifier may affect your radio reception, try to mount it at least 3 feet away from the radio tuner.
		When mounting the amplifier on a side wall, try to position it so that the slots in the cooling fins are vertical to allow the heat to rise easily.
		Amplifiers should not be mounted on the bottom of a parcel shelf with the fins facing down because the heat will radiate back up into the amplifier.
	www.justkenwood.co.uk /editorial/inst_amp.asp (2085 words)

	The Sonic Frontiers Power 2 Power Amplifier
		The Power 2's two 5687s, used as high-voltage drivers, are operated at 1/3 their maximum power rating and are kept within a safe operating temperature by a supplied pair of Pearl tube coolers.
		Each power tube in the Power 2 has an associated LED mounted next to it on the amplifier's top plate which, during biasing, will either glow green, indicating under-bias, red, indicating over-bias, or not at all when the tube is correctly biased.
		The Power 2's front panel sports a duet of stainless steel push buttons, one to turn the unit on and off and one to toggle it into or out of standby mode, and a pair of LEDs which indicate power-on status and whether the unit is in standby or operate mode.
	www.audiophilia.com /hardware/power2.htm (2908 words)

	Stereophile: Halcro dm38 power amplifier
		The dm38 is basically the circuit of the dm58 monoblock, duplicated for stereo but with reduced output power because the same heatsink area now has to be shared by two channels instead of being dedicated to one.
		AC power is supplied via an IEC connector on the base of the lower module, where the main power switch resides.
		The amplifier is switched in and out of standby with a button on the underside of the upper module.
	www.stereophile.com /amplificationreviews/1004halcro (1108 words)

	Power Amplifier : Analog Devices : Power Amplifier (Site not responding. Last check: 2007-08-08)
		No other company is more committed to developing the Power Amplifier that will make the digital future possible.
		ADI designs, manufactures and markets Power Amplifier products as well as high-performance, high-precision signal processing ICs that make pictures vibrant, voices clear, connections continuous and products portable.
		ADI is your source for the Power Amplifier as well as over 10,000 other products that serve the needs of more than 60,000 customers worldwide.
	www.analog.com /power_amplifier.html (278 words)

	300/500W Subwoofer Power Amplifier
		All devices are rated at 350V, with the power transistors having a 230W dissipation and the drivers are 50W.
		High power amps are not too common as projects, since they are by their nature normally difficult to build, and are expensive.
		The power transistors are all mounted underneath the board, and the mounting screw heads can be seen on the top of the board.
	sound.westhost.com /project68.htm (2678 words)

	40W No Tune FM Broadcast Power Amplifier Design
		The base of the power device sits through a cut-out in the floor of the diecast box and is bolted directly onto a small extruded aluminium heatsink.
		Any RF power amplifier must be followed by a low pass filter (LPF) to reduce the harmonics to an acceptable level.
		For the final power flatness tuning, because I had access to a smart RF laboratory with everything you could possibly require (test equipment wise, anyway) I used a Mini-Circuits ZHL-42W wideband amplifier to boost the output of the network analyser to enable me to tune the amplifiers' gain response flat at full output power.
	www.irational.org /sic/radio/40w-no-tune-amp.html (5129 words)

	Audio Power Amplifier
		This simple audio power amplifier was originally designed for a circuit board workshop, conducted by the OSU IEEE Student Group.
		At the workshop, 20 participants each constructed this amplifier, by etching and drilling the single sided circuit board, soldering all components, and attaching a pre-built heatsink assembly with the output transistors.
		A wide range of power transistors will work, but they should be rated for at least 100V, 8A, and 80W power dissipation.
	www.pjrc.com /tech/cbw (608 words)

	QSC RMX 4050HD Power Amplifier
		Per channel (two channels) power at 8 ohms, 1 kHz, 0.1 percent THD, the RMX 4050HD is rated at 850 W, 1,400 W at 4 ohms and 2,000 W at 2 ohms.
		Each channel has its own full-size toroidal power transformer, and the output circuit advances from two-tier Class H to three-tier Class H. This unique dual mono, high current power supply can deliver double the power, less AC current is wasted, and directs the power more accurately to the output section.
		Most amps of this power use a higher current plug that can't be inserted into a standard Edison outlet.
	www.proaudioreview.com /par/july03/qsc_rmx_4050hd.shtml (683 words)

	Power Amplifier Module features integrated power detector., RF Micro Devices, Inc.
		By incorporating the power detector technology on-chip, the RF5198 significantly reduces design complexity and streamlines the handset design process, thereby enabling handset manufacturers to quickly bring their advanced products to market.
		The high-power, high-efficiency RF5198 is a self-contained PA module with 50-ohm input and output and is internally matched to obtain optimum power, efficiency and linearity.
		The Company is a leading supplier of power amplifiers, one of the most critical radio frequency (RF) components in cellular phones.
	news.thomasnet.com /fullstory/460583 (1090 words)

	Power Modules - Home Page (Site not responding. Last check: 2007-08-08)
		It has the presence and musicality of the finest tube amplifiers, without any significant compromise this audiophile has been able to identify.
		Power Modules products are among the finest audio components available, at prices that make high-end audio an attainable reality for most consumers.
		From the 250 watt 350A power amplifer, to the less powerful, affordable 150A power amplifier, we have what you need.
	www.powermodules.com (431 words)

	Mark Levinson No. 336 Power Amplifier reviewed on AudioRevolution.com
		Rated at 350 watts per channel into eight ohms, 700 watts into 4 ohms and 1400 watts into 2 ohms, this dual mono, single-chassis power amp is designed to handle the most challenging of impedance loads on the most demanding genres of music.
		If you were to break out every performance element of an amplifier, you would rate the No. 336 very highly in each category, with scores of 8's, 9's and 10's.
		With the addition of the 400 series amplifiers, it is now easier to have an all-Mark Levinson 5.1 amplification system.
	www.audiorevolution.com /equip/levinson336 (1765 words)

	Crown amplifier, 4 amplifier ch crown, crown power amplifier (Site not responding. Last check: 2007-08-08)
		Crown CE1000-A2 Power Amplifier, Speakon and Barrier Outputs...
		Crown amplifiers are renowned for their ability to accurately amplify...
		Crown amplifiers and microphones are in use in all different aspects of audio.
	wildmotorcycle.com /crown-amplifier.html (1336 words)

	Amazon.com: Audio Power Amplifier Handbook: Books (Site not responding. Last check: 2007-08-08)
		The author systematically analyzes performance of power amplifiers and concludes eight sources of THD impairment.
		The book features the "blameless" amplifier and the circuit is given, but it would have been nice for the PCB layout (or a Gerber file..) to be included so that some quick experimentation can be done.
		He goes after the sources of amplifier distortion with a vengence and gives the reader his version of a "blameless" amplifier with parts values and device type numbers so that if you choose to try to duplicate his design for a one-off, you can do so.
	www.amazon.com /exec/obidos/tg/detail/-/0750656360?v=glance (1645 words)

	SoundTech PS802 Power Amplifier
		SoundTech PS802 Power Amplifier - Following in the footsteps of the popularly acclaimed PS800, SoundTech is proud to offer a further refinement of its "Smaller, Lighter and more Powerful" Power Source Series.
		Weight and size savings are especially important for portable sound applications, where smaller, lighter amplifiers yield daily savings in transportation and labor.
		The PowerSource SwitchMode power supply and Class-H Output circuits combine to yield a 20% improvement in energy efficiency, while retaining the punch required for today's challenging music.
	www.adirondackguitar.com /live_sound/soundtech/amps/PS802.htm (293 words)

	Products: Zeus Power Amplifier
		Incredibly powerful, yet fast and nimble, the Zeus amplifier sets a new standard in the "Superamp" category.
		Designed not only to achieve the highest levels of delicacy and transparency, Zeus is also capable of recreating true concert hall volumes and dynamics.
		A second standby switch allows the amplifier to remain warmed up and ready for immediate use between listening sessions.
	www.rogueaudio.com /Products_Zeus.htm (238 words)

	Carver ZR1600 Power Amplifier
		However, the spread-spectrum, Tripath amplifier is said to greatly reduce the intermodulation distortion typically seen in Class D designs by dramatically increasing the switching frequency with an average speed of 700 kHz.
		Front panel controls and features include a power switch (with off, on and standby), a standby LED, volume controls (defeatable), high-pass filters (40 Hz or 80 Hz) with LED indicators, clip limiters with LEDs, and a seven-tiered LED signal ladder.
		The amp is purported to be 81 percent efficient at full power and around 70 percent efficient at 1/3 power - a valuable feature when working in venues with limited power.
	www.proaudioreview.com /par/july03/carver_zr1600.shtml (795 words)

	TIPs, Inc. (Site not responding. Last check: 2007-08-08)
		NOTICE: Linear Power is currently not in operation, but may re-open in the future.
		If you do need to send your Linear Power product in for service or repair, you will need to send it to TIPS for a fast return (approximately 2 days).
		Linear Power amplifier manuals and installation instructions will be back online soon.
	www.linearpower.com (108 words)

	ESX Q1202 Power Amplifier
		is a non-issue when it comes to amplifiers, but this amplifier performs like a
		amplifier was putting out more than its rated power (120x2 or 400x1 into 4
		amplifiers that cost less than $2/watt: a touch of coloration.
	www.teamrocs.com /reviews/amplifiers/ESXq1202.htm (961 words)

	StereoTimes -- Sunfire Signature Power Amplifier (Site not responding. Last check: 2007-08-08)
		Krell FPB600 stereo amplifier, KR Enterprise VT8000MK tube monoblocks, frequently used to bi-amp the speakers with the Krell to the bass modules and the KR amps to the mid/tweeter modules.
		On the other hand, the KR amplifiers that Noel continues to refer to as world beaters (at $28,500 they'd better be!), would probably blow up (as my units have three times previous) if they were asked to reproduce a fraction of the power coupled with the extreme finesse Carver’s Sunfire produces.
		So what we have, dear reader, is an amplifier that in most setups should simply astound regardless of what amplifier you own.
	www.stereotimes.com /amp010500.shtm (1678 words)

	Behringer EP2500 Power Amplifier - zZounds.com (Site not responding. Last check: 2007-08-08)
		The EP2500 is an extremely musical power amp that can take a whole night’s worth of abuse without missing a beat -- even at 2 ohms!
		Each Europower has a massive power supply with a low-noise toroidal transformer and lots of headroom, so your music sounds great -- even when you push the amp to the limit -- and it stays that way!
		Add an extremely effective cooling system and you have an amp that is guaranteed to be trouble-free.
	www.zzounds.com /item--BEHEP2500 (544 words)

	Crown Ce4000 Power Amplifier (Crown-CE4000) - PriceGrabber.com
		The CE4000 is the result of over 30 years of Crown amplifier design experience.
		And it's the best of all worlds thanks to unique features like Crown's patented, award-winning Balanced Current Amplifier technology.
		BCA gives the CE4000 superior power output with increased efficiency plus legendary Crown sound and reliability.
	www.pricegrabber.com /search_getprod.php/masterid=2610859 (121 words)

	Precision Power Amplifier (Site not responding. Last check: 2007-08-08)
		Returning to Switzerland, she received the appointment of Court painter at Baden in 1829.
		Neither the Sinn Fein leaders nor the people believe in the power of the Irish vote in the British House of Commons.
		They still took the same precautions, and it was always a mass of herbs that the current seemed to carry on its surface.
	home.elaterate.com /precision_power_amplifier.html (2246 words)

	☞ amplifier - power series amplifiers by rockford fosgate (Site not responding. Last check: 2007-08-08)
		Welcome to one of the biggest amplifier sites on the Internet - with thousands of pages of information on amplifier, power series amplifiers by rockford fosgate and much more!
		Shop for an amplifier power on eBay or find thousands of other items to buy and sell.
		Starware search is an excellent resource for quality sites on power series amplifiers by rockford fosgate and much more!
	www.all-amplifier.info /power-series-amplifiers-by-rockford-fosgate.html (470 words)

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