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Topic: Voltage regulator

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	Voltage regulator -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		A voltage regulator is an (A device that produces or is powered by electricity) electrical device designed to automatically maintain a constant (The rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts) voltage level.
		In fixed voltage regulators the reference pin is tied to ((art) the surface (as a wall or canvas) prepared to take the paint for a painting) ground, whereas in variable regulators the reference pin is connected to the centre point of a fixed or variable voltage divider fed by the regulator's output.
		A variable voltage divider (such as a (A resistor with three terminals, the third being an adjustable center terminal; used to adjust voltages in radios and TV sets) potentiometer) allows the user to adjust the regulated voltage.
	www.absoluteastronomy.com /encyclopedia/v/vo/voltage_regulator.htm (1302 words)

	Series voltage regulator
		The 14.4 output voltage is a momentary deviation, or variation, from the required regulated output voltage of 14.3 and is the result of a rise in the input voltage to 20.1 volts.
		With a base-emitter voltage of 0.7 volt, the output voltage is equal to the sum of the voltages across CR1 and the voltage at the base-emitter junction of Q1.
		Since the output voltage is composed of the Zener voltage and the base-emitter voltage, the output voltage momentarily increases to 6.4 volts.
	www.tpub.com /neets/book7/27k.htm (1199 words)

	Articles - Voltage regulator (Site not responding. Last check: 2007-10-21)
		Early automobile generators and alternators had a mechanical voltage regulator using two or three relays and various resistors to stabilize the generator's output at slightly more than 6 or 12 V, independent of the engine's rpm or the varying load on the vehicle's electrical system.
		A voltage stabiliser is a type of household mains regulator which uses a continuously variable auto-transformer to maintain an AC output that is as close to the standard or normal mains voltage as possible, under conditions of fluctuation.
		That is followed by a linear regulator that generates exactly the desired voltage and eliminates nearly all the noise generated by the switching regulator.
	www.zgrey.com /articles/Voltage_regulator (1084 words)

	[No title]
		The input voltage will need to be about 5.5 volts greater than the output at full load and heat dissipation at full load would be about 23 watts, so a fairly large heat sink may be needed for both the regulator and pass transistor.
		For good efficiency the voltage at the collectors of the two parallel 2N3055 pass transistors should be close to the output voltage.
		The output voltage is set with the voltage divider (1K/560) so that 1.7 volts is applied to the 3904 base when the output is 5 volts.
	ourworld.compuserve.com /homepages/Bill_Bowden/page12.htm (1511 words)

	+/-12V -> +/-5V Power unit (Site not responding. Last check: 2007-10-21)
		As the regulator, LM317 is used for the positive voltage and LM337 is used for the negative voltage.
		The regulator becomes hot when outputting the 1 A electric current and when there is not a heatsink, the regulator breaks.
		The merit of the regulator of this type is what little noise occurs and is cheap and there are few use parts.
	www.interq.or.jp /japan/se-inoue/e_ckt21.htm (173 words)

	Electrical System: Voltage Regulator (Site not responding. Last check: 2007-10-21)
		Description: The voltage regulator is an electronic device that regulates alternator output according to the battery’s state of charge and accessory loads.
		Today’s compact electronic voltage regulators may be housed inside the alternator or the voltage regulator function may be handled by the vehicle’s powertrain control module (PCM).
		Symptoms of a faulty voltage regulator may include a discharged battery, short battery life, poor accessory and lighting operation, frequent bulb replacement, lower than normal dashboard voltmeter readings, an illuminated charging system warning light, frequent topping off of the battery’s electrolyte, and diagnostic trouble codes stored in the vehicle’s PCM.
	www.carcarecouncil.org /Electrical/voltage_regulator.shtml (247 words)

	Finesse Voltage Regulator Noise!
		Many voltage regulators have excessive levels of output noise including voltage spikes from switching circuits and high flicker noise levels from unfiltered references.
		The regulator's noise voltage appears across this resistor so the noise current is shunted to ground through the transistor's collector.
		The regulator's noise is 330 nV per root-hertz at 100 hertz and the circuit reduces this noise to 20 nV.
	www.wenzel.com /documents/finesse.html (1272 words)

	Curve Tracer Example 3 - Microwave Encyclopedia - Microwaves101.com
		This "overhead" must be exceeded before the regulator outputs any current, and it is usually quite close to the regulator's minimum drop-out voltage.
		If you subtract the overhead of 1.5 volts from the the point where it begins regulation, this is a good indication of the voltage output of the regulator.
		This is a good thing, voltage regulators are not usually stable without a microfarad or two on input and output.
	www.microwaves101.com /encyclopedia/curvetracerX3.cfm (721 words)

	Bosch Charging systems
		The voltage regulator senses the battery voltage in a rather indirect manner through the diode board and uses this information to control the current to the field winding of the alternator.
		If the battery voltage is too high, the voltage regulator reduces the field current which decreases the strength of its magnetic field and the output of the alternator.
		The voltage drop across these diodes is roughly equal to the drop across the larger diodes and causes the voltage they provide to the voltage regulator to roughly equal the voltage at the battery.
	www.buchanan1.net /charge.shtml (2214 words)

	[No title]
		The 15 amp AR-1215 AC Line Voltage Regulator is intended to protect audio, video, computer and other electronic equipment from problems caused by AC line voltage irregularities-sags, brownouts, or overvoltages that can cause sensitive digital equipment to malfunction, or, in extreme cases, to sustain damage.
		Voltages beyond that range may also be converted to usable levels, depending on how far out of range they are.
		A bar-graph meter comprised of 10 LED's indicates input voltage, while another LED indicates "In Regulation" status (i.e., that the output voltage is within ±5V of 120V.) The unit is housed in a compact, single-space rack-mount chassis, 1.75" high and 8" deep (8.9 x 43.2 cm) and weighs only 12 lbs.
	www.americanmusical.com /item--i-FUR-AR1215.html (748 words)

	What is voltage regulator? - A Word Definition From the Webopedia Computer Dictionary (Site not responding. Last check: 2007-10-21)
		The voltage regulator's job is to reduce the 5 volt signal to the lower voltage required by the microprocessor.
		Pentium microprocessors with MMX actually require two voltage regulators -- one for the internal (core) voltage, and one for the I/O drivers at 3.3 volts.
		Some voltage regulators, particularly those packaged as a voltage regulator module (VRM), are voltage ID (VID) programmable, which means that the microprocessor can program the voltage regulator to provide the correct voltage during power-up.
	www.webopedia.com /TERM/V/voltage_regulator.html (265 words)

	PS3 voltage regulator
		The PS-3 regulator board is a low cost solid state voltage regulator circuit that provides very good load and line regulation resulting in a ripple output that is extremely low.
		Most voltage regulators we are familiar with these days incorporate the use of feedback which monitors the current demand and then feeds this information back to the regulator that in turn increases or decreases the current.
		The regulated output voltage is obtained by selecting four zener diodes with voltage ratings that sum to the desired output voltage.
	www.welbornelabs.com /ps3.htm (800 words)

	12 Volt 30 Amp Power Supply (Site not responding. Last check: 2007-10-21)
		Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 30 amps.
		The input voltage to the regulator must be at least several volts higher than the output voltage (12V) so that the regulator can maintain its output.
		The input current to the regulator is fed via the emitter resistor and base emitter junctions of the power transistors.
	www.mitedu.freeserve.co.uk /Circuits/Power/1230psu.htm (532 words)

	[No title]
		Output voltage is adjusted from 0 to Vref(=12V).
		On this circuit, the current supply point of the zenner diode is changed from the Vcc to the regulated output voltage of this circuit.
		Voltage adjustable range of this circuit is the same with Fig7.
	www.intio.or.jp /jf10zl/reg.htm (583 words)

	5V power supply teams low-dropout regulator, charge pump - 1/8/2004 - EDN (Site not responding. Last check: 2007-10-21)
		Regulated charge pumps do this job, but they are uncommon, and they often command a premium price.
		To cancel the voltage drop that charge-pump output impedance causes, the circuit feeds the 5V output back to the low-dropout regulator, which alters its output to maintain output regulation.
		Furthermore, because the low-dropout regulator and charge pump are available in SOT-23 packages, the overall footprint of the circuit in Figure 1 is comparable to that of a regulated-charge-pump circuit.
	www.edn.com /article/CA371089.html (547 words)

	Miniture Off-Line Supply (Hobby Circuits)
		The traditional circuit usually chosen is a classic linear regulator consisting of a small iron core transformer, a bridge rectifier, a filter capacitor and a voltage regulator.
		The circuit transfers power from the 120vac line to a voltage regulator circuit by discharging a capacitor through a small high frequency transformer, twice each power line cycle.
		Each time the capacitor C1 is discharged voltage spikes are induced in the primary winding of the transformer T1.
	www.imagineeringezine.com /e-zine/off-line.html (261 words)

	Temperature Controlled NICD Charger
		The 7805 voltage regulator is wired as a constant current regulator.
		Parts placement is non critical with the exception of the thermistors which should be epoxied to separate aluminum plates and connected back to the main circuitry via a cable with two wires and a shield.
		Over-discharging to a negative voltage is supposed to cause conductive dendrite growth within the cell, that causes the cells to self-discharge.
	www.solorb.com /gfc/elect/tmpchrg/index.html (1178 words)

	Voltage Regulator (Site not responding. Last check: 2007-10-21)
		Electronic circuits that are designed to operate at a specified voltages may not function properly if the voltage varies by even 5%.
		A voltage regulator circuit is designed to produce an output voltage within 1% variability, even if the source voltage powering the regulator circuit varies by up to 25%.
		This voltage regulator was designed for use with a 9 volt battery.
	web.acc.qcc.cuny.edu /nsfrobot/regPS.htm (580 words)

	VOLTAGE REGULATOR (Site not responding. Last check: 2007-10-21)
		Voltage Regulator is a experimental sound project headed by its founder James Kosharek.
		Voltage Regulator breaks the boundries of conventional music, using insturmentation and effects in their own twisted and unique ways.
		Voltage Regulator spends much of their time on the road, running into improvisational mishaps that later become tracks on their albums.
	www.torturemusic.com /volreg1.html (206 words)

	World Voltage Regulator Markets
		There is a sizable potential market for voltage regulators in Asia, South America, Africa, and the Middle East since their electrical generation and distribution infrastructure is still nascent.
		While fluctuations in the supply voltage in the United States is about 5 percent, it is around 20 percent in Mexico and South America and 10 to 15 percent in developing nations of Asia.
		The drive to modernize industrial and telecommunication systems in developing countries has to be backed with investments in voltage regulators to protect the equipment and extend their lives.
	www.marketresearch.com /redirect.asp?productid=973043&progid=3603 (538 words)

	Circuit Lab
		The gate drive voltage required for the MOSFET is generated using a voltage doubler circuit consisting of diodes D1 and D2 and capacitors C1 and C4.
		Adjustable shunt regulator TL431 (IC2) is used here as an error amplifier, and it dynamically adjusts the gate voltage to maintain the regulation at the output.
		The gate voltage here is generated using an LM555 charge pump circuit as follows: When 555 output is low, capacitor C2 will get charged through diode D1 to the input voltage.
	www.electronicsforu.com /efylinux/circuit/cir124.htm (478 words)

	Voltage Regulator Accessories
		The ICRM minimizes inrush currents on voltage regulators that incorporate Pulse Width Modulated (PWM) technology when they are powered from station service sources that are already at nominal levels.
		One is the Series Boost Option that maintains a constant power input for the voltage regulator and the other is the Current Boost System that supplies needed excitation directly into the field of the generator along with the regulator output.
		The manual voltage controller allows for operator control of the generator's voltage when the automatic voltage regulator is removed from the voltage control loop.
	www.basler.com /html/rscacc.htm (838 words)

	voltage regulator module - a Whatis.com definition - see also: VRM (Site not responding. Last check: 2007-10-21)
		A voltage regulator module (VRM) is an installable module that senses a computer's microprocessor voltage requirements and ensures that the correct voltage is maintained.
		If you are changing your computer's microprocessor (for example, changing from a Pentium to a Pentium Pro or a Pentium with MMX), you need to add a voltage regulator module to the existing voltage regulator in the motherboard so that the new voltage requirements can be detected and accommodated.
		Adding a VRM allows it to regulate the voltage for I/O while the original regulator built into the motherboard continues to regulate core voltage.
	whatis.techtarget.com /definition/0,,sid9_gci213326,00.html (206 words)

	RedVector.com :: Voltage Regulator Application (1 hour)[S] (Site not responding. Last check: 2007-10-21)
		The methods for regulating voltage and the types of regulators used on electric systems are discussed.
		Features of voltage regulators and how to use the controls on a voltage regulator are explored.
		Methods to improve the voltage profile on an electric distribution system are investigated including the use of line drop compensation as a power quality tool.
	www.redvector.com /web_store/add_course.asp?id=769 (251 words)

	BOSCH Voltage regulator mod
		Unfortunately the Bosch regulators seems to be a bit conservative with respect to charging voltage and the current has to flow from the alternator in the rear, the Pantera has the engine midships, through a rather long wire to the ampere meter on the dash and to the battery in the front.
		One problem I faced was that the alternator is an older Bosch type with 32mm slip rings and the regulator was for a newer one with 28mm rings and that made the plastic around the brushes to interfere sligthly with the rings.
		The regulator senses the voltage between D+ and ground and adjusts the current to the rotor to obtain the nominal voltage.
	www.detomaso.nu /~thomast/alternator (711 words)

	Voltage regulator - Chapter 5: DISCRETE SEMICONDUCTOR CIRCUITS - Volume VI - Experiments (Site not responding. Last check: 2007-10-21)
		Zener diodes are frequently used as voltage regulating devices, because they act to clamp the voltage drop across themselves at a predetermined level.
		Whatever excess voltage is supplied by the power source becomes dropped across the series resistor.
		It is helpful to think of a zener diode as a voltage limiter: establishing a maximum voltage drop, but not a minimum voltage drop.
	www.allaboutcircuits.com /vol_6/chpt_5/7.html (450 words)

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