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Topic: Preamplifier

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	The Pressive - A DIY passive preamplifier [English]
		The main duty of a preamplifier is to raise the signal from a source's output level to an amplifier's input level.
		Actually, this second output was not conceived for a recorder: it was so this preamplifier could also be used as a switching box to test line stages or signal processors, comparing their output with the "direct" signal.
		What I want to clarify is that this preamplifier is useful only to have a stable and repeatable scheme with which one can perform comparison tests, with correct level regulation, something that in lots of cases is (wrongly!!!) forgotten.
	www.tnt-audio.com /clinica/pressive_e.html (1373 words)

	Hardware Analysis - Velleman K8020 high-end tube preamplifier - Vacuum tubes
		Preamplifiers come in all shapes and sizes, it its simplest form a preamplifier is just a potentiometer and input selector with no gain.
		But obviously there’s a wealth of preamplifiers that do offer a bit of gain and use a variety of concepts.
		I was looking for a simple preamplifier that would offer me a number of inputs and would allow me to upgrade or improve upon it by simply replacing parts with better ones.
	www.hardwareanalysis.com /content/article/1826 (451 words)

	Everett Infrared and Electro-optic Technology - Preamplifiers for Electro-optic Detectors
		In either case the preamplifiers that connect directly to the detectors are basically the same although the implementations may differ.
		A preamplifier, of course, necessarily provides an additional parallel shunt path for neutralization of the surface charge, and the resistance of that path must be greater or at least not smaller than the shunt resistance of the detector itself if it is not to significantly reduce the detector signal and degrade performance.
		The output signal from the preamplifier is proportional to the optical power incident on the detector in the case of the quantum detector and to the difference in that power and the equivalent ambient power in the case of the thermal detector.
	www.everettinfrared.com /preamplifiers.htm (5836 words)

	StereoTimes - ADCOM GFP-750 Preamplifier
		Preamplifiers provide a control center for your system, switching between the various sources and stepping up their lower output voltages to levels that are able to drive most power amplifiers to full rated output and beyond.
		Even preamplifiers in the price range of three to four, or even ten times the price of this review unit, can not fully achieve this.
		Since any distortion introduced by the preamplifier will be magnified by the power amplifier, maintaining the purity of the signal is critical.
	www.stereotimes.com /amp080299.shtml (1953 words)

	NCSIDO - Antenna & Preamplifier
		The antenna is held to the side of the preamplifier box using a a clamp made of two three-inch-long pieces of one-inch-square acrylic plastic stock and a half-dozen brass machine screws.
		The electrical signal from the feed-through is conveyed to the preamplifier input with a free-standing capacitor designed to serve as a second-line sacrifical fuse in case of significant electrical assult.
		The gain of this preamplifier is quite high and its behavior is unstable and prone to oscillation when the metal box's cover is not present.
	xtrsystems.com /vlf/antenna_preamp (1321 words)

	Preamplifiers
		VTL preamplifiers are designed to drive any power amplifier, allowing you to have the most choice possible.
		VTL preamplifiers are also designed to be able to drive low input impedance solid state power amplifier with full frequency response, allowing you to have the sweet sound of tubes with the current of solid state.
		The TL-2.5 all tube line stage preamplifier is designed for performance -- giving you music that is direct from the source, in the most realistic, colorless and truthful way we know how.
	www.vtl.com /pages/preamplifiers.html (742 words)

	Philip Jackson's HiFi DIY Project - New Preamplifier Page
		The preamplifier is a solid state device built around Rod Elliot's high-quality Project 88, Project 06, and Project 99 opamp-based preamplifier circuits.
		Shielded cable between the input jacks and the selector switch, between the preamplifier and the volume and balance pots, and from the preamplifier to the mute circuit comes from decent-quality commercial interconnects.
		This is not exactly true, however, because the preamplifier must be on to use the headphone amplifier with the turntable because the phono preamplifier requires power.
	members.tripod.com /omordicai/hifi/preampNew.html (2099 words)

	Gordon Microphone Preamplifier System (Site not responding. Last check: )
		Preamplifier design concepts have not changed much since the advent of electronic amplification.
		In the Gordon preamplifier, the gain in the signal path is variable, equal to the actual setting of the gain control, with no loop feedback, no attenuators, nor the associated redundant gain.
		Outboard microphone preamplifier outputs see a wide range of loads due to signal frequency, cables, transformer inputs, and electronic inputs, varying from less than a hundred to over a million ohms.
	www.gordonaudio.com (641 words)

	Dual mode music instrument preamplifier (US4701957)
		A shunt network may be switched across the output terminal to equalize output amplitude of the preamplifier circuit between the first and second modes of operation.
		A preamplifier circuit for enhancing sound generated by a musical instrument such as a guitar and which is converted into electrical signals comprising:
		first preamplifier means connected to said passive input network for non-distortion amplification of said electrical signals in a first mode of operation and capable of saturation distortion amplification of said electrical signals upon being overdriven in a second mode of operation,
	www.delphion.com /details?pn=US04701957__ (295 words)

	System Configuration Guide - Detectors & Preamplifiers
		A preamplifier with a 1 ns rise time and a voltage gain of x10 to x100 is usually ideal for this application.
		With proper matching of the preamplifier to the detector, this input noise should not be a limiting factor for processing signals in mass spectrometry.
		If the preamplifier rise time is much shorter than the detector rise time, the detector will limit the rise time, and the extra bandwidth of the preamplifier will increase its input noise unnecessarily.
	www.sense-dac.com /ms/SysConfigDetectorPreamps.htm (752 words)

	What is a Preamplifier?
		A preamplifier may also be used with a television in order to improve antenna or satellite communication.
		The preamplifier may also be kept close to the source of its electrical signal while maintaining a distance from the power amplifier, such as when it is near a hi-fi entertainment system or when it is part of the home computer.
		If the preamplifier has its own housing and is to be used with the sound system of a band, it may be anchored to microphones, turntables, an electric bass, or an electric guitar.
	www.wisegeek.com /what-is-a-preamplifier.htm (374 words)

	Low noise microphone preamplifier (US6275109)
		An open-loop differential amplifier of the preamplifier is coupled to the biasing circuit.
		The differential amplifier includes a differential amplifier pair having first and second differential amplifying transistors, which are coupled at respective gate terminals to the first and second differential input signals.
		An integrated circuit comprising a preamplifier for amplifying an input signal comprising first and second non-amplified differential input signals to provide an amplified output signal comprising first and second differential output signals, the preamplifier comprising:
	www.delphion.com /details?pn=US06275109__ (333 words)

	Microphone Preamplifier Project
		preamplifier, I began to think about developing a printed circuit board to complement his work.
		Parts for the preamplifier are available separately including the pcb, components, case, connectors, and even the microphone capsule.
		Once the preamplifier and microphone wand are assembled, a few quick tests using a minimum of test equipment can help determine if it is working properly.
	orca.st.usm.edu /~jmneal/preamp1.htm (3984 words)

	CSP selection guide
		Cremat's preamplifier model having the highest gain and best noise performance is the CR-110, and for this reason it may be the best choice for many customers.
		A good approach to selecting the right preamplifier is to choose the model having the largest gain which is also capable of detecting the largest pulses you expect to detect in your application.
		If AC coupling is used between the detector and preamplifier, the count rate capability of the preamplifier is dramatically increased, at least if we use our simplifying assumption that the detector signal current is made of very many small pulses.
	www.cremat.com /preamplifier_choice.htm (939 words)

	preamplifier1
		The preamplifier unit can be found in any basic audio amplifier that is available in the market.
		The main purpose of the preamplifier is to act as an intermediate voltage gain stage between the input signal source and the power amplifier.
		In the above diagram, the preamplifier is divided into 6 stages: the microphone amplification stage, the mixer stage, the low and high pass filter stage, the graphic equaliser stage, the summing stage and the output stage.
	www.fortunecity.com /meltingpot/brazos/9/preamplifier/preamplifier1.htm (460 words)

	AssistiveAudio: AMPETRONIC MP101 Microphone Preamplifier (Site not responding. Last check: )
		The MP101 is a single channel preamplifier, for use in situations where gain is needed to convert a single microphone to line level.
		This preamplifier was designed by AMPETRONIC for use with their Induction Loop Drivers, but it can be used in a wide range of applications in other situations.
		An important application of this preamplifier is where a loop system is driven from an existing audio mixing desk, where the sound signal can be reduced to nil.
	www.assistiveaudio.com /MP101.htm (216 words)

	Einstein preamplifier
		The Heart of the Einstein Tube Preamplifier is a totally new invented concept.
		The atmosphere Einstein's tube preamplifier gives you is fascinating, it's life-like presentation is clear, musical, and full of detail.
		It is and endless pleasure with the Einstein Tube preamplifier to recapture and experience the music as it is. $13,850.
	www.audiolimits.com /html/einstein_preamplifier.html (516 words)

	The Sonic Frontiers Line 1 Preamplifier (Site not responding. Last check: )
		Furthermore, the elimination of a preamplifier's circuitry, and its partnering pair of interconnects, results in a simpler, often sonically superior, reproduction chain.
		If you're looking for a preamplifier which will add an artificial sense of warmth or body to the sound of recorded music, then look elsewhere - transparency and neutrality, rather than euphonic colorations, are what the Line 1 is about.
		Further comparisons between the Line 1 and the Premier II revealed the bottom-end of the latter preamplifier to be loose and lacking in extension and definition.
	www.audiophilia.com /hardware/line1.htm (3799 words)

	Preamplifier Tester (Site not responding. Last check: )
		The calorimeter signals are supplied to the preamplifiers located in housing units mounted to the outside of the calorimeter.
		The mechanical structure of the new preamplifiers is identical to the old, but they demand new motherboards and power supplies to operate.
		Before the preamplifiers are connected to the calorimeter, they have to be tested for proper operation.
	sist.fnal.gov /archive/97-topics/papers/JerolynSmith/JAY1.html (3258 words)

	Classic tube preamplifier preamplifier vacuum tube (Site not responding. Last check: )
		The circuitry in this preamplifier is capable of reproducing perfect square and sine waves from the sub sonic to well beyond the range of human hearing.
		The preamplifier was designed to allow the user to adjust volume levels of the power amp driven and to select between many different sources while adding and or subtracting nothing from the original sound source.
		The Preamplifier is not a digital effects box but rather a means to control the power amplifier via volume attenuation and source selection.
	home.alltel.net /wbittle1/PA1.html (553 words)

	SR550 Preamplifier (Site not responding. Last check: )
		The SR550 Remote Voltage Preamplifier is designed to work with any SRS lock-in amplifier.
		Preamplifiers are designed to provide gain close to the experimental detector, before the signal to noise ratio is permanently degraded by cable capacitance and pickup.
		The preamplifier minimizes noise and pickup in the connecting lines and reduces measurement time in noise limited experiments.
	www.korins.com /m/srs/sr550.html (178 words)

	BF981 Mosfet tunable RF preamplifier (Site not responding. Last check: )
		In this case the preamplifier overloads the RF and mixer stages.
		Receivers and tuners have a sensitivity threshold, which is the amount of RF input signal required to cause the receiver to produce something watchable or listenable.
		So by adding the preamplifier, you have just taken a backwards step to a higher/taller "noise wall" at your receiver which is not desirable.
	www.geocities.com /toddemslie/bf981_preamp.html (4135 words)

	Chris Report - THE TAG McLAREN F3 SERIES ANALOG PREAMPLIFIER - PA10
		The Tag Mclaren Audio preamplifiers set the standard by incorporating a number of unique and innovative design features on the route to creating a state of the art preamplifier.
		The DC stabilization is performed by a path which is decoupled at audio frequencies while the audio frequency signals are coupled through high quality plastic film items which are in turn bypassed with low inductance polypropylene components.
		The dual feedback path configuration was the inspiration for the development, which led to the straight-line concept with the direct coupled forward, and feedback paths in the PA10 preamplifier.
	www.1388.com /articles/chris_report/10_tag.htm (461 words)

	Preamplifier includes gain, filtering, and TEDS., PCB Piezotronics Inc.
		The preamplifier allows the user to select 0 or +20 dB of gain and either a 20 Hz (-3dB) High Pass Filter or A-Weighted filter output response, in lieu of flat unfiltered response, via two switches, located on the external diameter.
		Model 426A11 preamplifier includes both A-weight and selectable "High Pass" filter, for automotive or aerospace cabin testing requirements.
		To make the cabin less noisy, a random incidence microphone (such as PCB Model 377B20), designed to measure sound from different angles of incidence, along with A-weight filter, is the choice of test equipment.
	news.thomasnet.com /fullstory/493411/rss (869 words)

	ORTEC 296 ScintiPack Photomultiplier Base with Preamplifier and HV Supply
		The adaptor attaches to the preamplifier power plug at the amplifier, and supplies the preamplifier signal on a coaxial cable for connection the front-panel input of the amplifier.
		The signal from dynode 10 is integrated on a 500-pF capacitor at the preamplifier input, amplified by the preamplifier gain, and presented as a positive-polarity pulse at the PREAMP output.
		The 60-cm-long preamplifier signal cable from the adaptor terminates in a BNC connector for connection to the input of a spectroscopy amplifier.
	www.ortec-online.com /electronics/pmt/296.htm (1467 words)

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