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Topic: Darlington Pair

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	Current Amplification Using the Darlington Pair of Bipolar Transistors
		The very high current gain (e.g., 10000) of a Darlington pair means that only a tiny amount of base current is needed to make the pair switch on.
		A Darlington pair behaves just like a single transistor with a very high current gain, i.e., it can also be modeled as having the three terminals of a typical transistor - the base, the emitter, and the collector.
		Darlington pairs packaged as a single transistor are already very common in the marketplace.
	www.ecelab.com /darlington.htm (379 words)

	Darlington transistor - Wikipedia, the free encyclopedia
		In electronics, the Darlington transistor is a semiconductor device which combines two bipolar transistors in tandem (often called a "Darlington pair") in a single device so that the current amplified by the first is amplified further by the second transistor.
		When a Darlington pair is fully conducting, there is a residual saturation voltage of 0.6 V in this configuration, which can lead to substantial power dissipation.
		A Darlington pair can be sufficiently sensitive to respond to the small current passed by skin contact, and can thus be used to make a touch sensitive switch.
	en.wikipedia.org /wiki/Darlington_transistor (539 words)

	The Messenger's Sports News
		Darlington’s Stacy Weather-ford and Sumter’s Jordan Atkinson were locked up in a pitcher’s duel for the eight innings that Dixie softball rules allow.
		Darlington scored a pair of insurance runs in the sixth, earning its third straight win against its county rivals and defeating Hartsville 5-1, eliminating Hartsville from the Debs tournament.
		Darlington Ponytails saw their tournament come to and end as Walterboro scored a pair of runs in the fourth inning, earning a 3-2 win in the elimination game.
	www.hartsvillemessenger.com /Sports/050720_sportdesk1.php (1286 words)

	BBC SPORT \| Football \| Teams \| Darlington \| Darlington reward pair
		Darlington have rewarded summer signings Ashley Nicholls and Ryan Valentine with new, extended contracts at Feethams.
		Valentine, 20, joined Darlington from Everton and has been an ever-present in the Quakers defence in the Third Division.
		Links to more Darlington stories are at the foot of the page.
	news.bbc.co.uk /sport1/hi/football/teams/d/darlington/2558447.stm (119 words)

	United States Patent: 5,491,437
		Transistor 20 may be replaced by a pair of transistors 20a and 20b coupled in a Darlington pair as shown in FIG.
		It is noted that transistor 44 may be replaced with an appropriate Darlington pair of NPN bipolar junction transistors, so as to reduce the output current drive requirements of amplifier stage 14.
		Clamp 162 also uses a Darlington pair comprised of transistors 166 and 168 to allow reduced bias current operation, and this requires the addition of diode connected transistor 178 to insure that clamp 162 operates to produce a lower voltage limit of one diode drop at node 164.
	users.ece.gatech.edu /rincon-mora/patents/p5491437.htm (5360 words)

	Proportional motor control circuit - Patent 4851753
		A motor control circuit as defined in claim 5, further comprising a diode bridge circuit in parallel with said Darlington configured transistor bridge circuit wherein the diodes of said diode bridge are electrically connected in a parallel and complimentary fashion to said Darlington connected transistors of corresponding bridge legs.
		The collectors of Darlington switching amplifiers 61 and 63 are connected to the L terminal of the tilt motor 60.
		This causes transistor 45 to conduct and Darlington switches 62 and 63 are turned on to cause the tilt motor 60 to rotate in an opposite direction to that experienced when the wiper was moved in the opposite direction in the first example.
	www.freepatentsonline.com /4851753.html (3108 words)

	Darlington Pairs
		A darlington pair is used to amplify weak signals so that they can be clearly detected by another circuit or a computer/microprocessor.
		The circuit opposite is a ‘Darlington Pair’ driver.
		The important point to remember is that the Darlington Pair is made up of two transistors and when they are arranged as shown in the circuit they are used to amplify weak signals.
	www.technologystudent.com /elec1/transis2.htm (386 words)

	Sziklai pair - Wikipedia, the free encyclopedia
		In contrast to a Darlington pair however, the Sziklai pair are made up of transistors of two kinds, NPN and PNP, which is why this configuration is sometimes called the "complementary Darlington".
		Sziklai pairs sometimes find an application in the output stages of power amplifiers (for audio, etc) where the designer wishes to use devices of the same type (NPN, say) for the final power transistors, instead of complementary types, which rarely match all that accurately.
		As with a Darlington pair, a resistor between 100Ω and 1kΩ is usually connected between the emitter of Q2 and the collector of Q1 to improve the turn-off time of Q2 - this helps to improve the performance of the pair at high frequencies.
	en.wikipedia.org /wiki/Sziklai_pair (344 words)

	ed1
		The circuit consists of a Darlington Pair which is nothing but a combinations of two transistors.
		The primary advantage of using Darlington Pair amplifiers is the simplicity of the circuit but this is offset by its undesired large size.
		We were aware that Darlington pairs made by MOTOROLA and other companies are commercially available in the market but these are very costly.
	members.tripod.com /~roboproject/ed1.htm (1616 words)

	Midcom, Inc.
		The basic circuit is a diode bridge connected to a biased darlington transistor in the common collector cascade configuration with an ac ground at the base.
		It is possible to understand operation of the circuit in a general way by inspecting the circuit and noting that the darlington connected transistors can be treated as a single transistor having a very high beta and a Vbe twice that of a single transistor.
		Assuming for the moment that base current is negligible with respect to the current flowing in R1 and R2, the voltage at the base of Q1, Vb, is the ratio of the voltage divider created by R1 and R2.
	www.midcom-inc.com /Tech/tn11.asp (851 words)

	Transistors
		A Darlington pair is two transistors connected together to give a very high current gain.
		This gives the Darlington pair a very high current gain such as 10000.
		Darlington pairs are sold as complete packages containing the two transistors.
	www.kpsec.freeuk.com /components/tran.htm (1577 words)

	Bipolar Junction Transistors
		The key advantage of the Darlington configuration is that the total current gain of the circuit equals the product of the current gain of the two devices.
		Since the two devices share the same collector, the saturation voltage of the Darlington pair equals the forward bias voltage of transistor Q2 plus the saturation voltage of transistor Q1.
		The Thyristor has a lower on-state voltage than the Darlington pair and typically requires an even smaller turn-on current, which only needs to be applied temporarily because of the internal positive feedback between the two transistors of the equivalent circuit.
	ece-www.colorado.edu /~bart/book/book/chapter5/ch5_9.htm (1430 words)

	Early fault detection in an opto-matrix touch input device - Patent 4645920
		The opto-matrix touch input device of claim 4 wherein the processor means comprises means for indicating the degradation or failure of individual emitter detector pairs both independently of and in conjunction with detection of the presence of a passive stylus between corresponding emitters and detectors.
		The collector terminal associated with the Darlington transistor pair for I/O line PB0 is connected to one terminal of resistor R10 while the collector terminal associated with the Darlington pair for I/O line PB1 is connected to one terminal of resistor R9.
		At this point a processing of an X coordinate emitter/detector pair is initiated at 610 and presented as 620 to begin again at block 130 which fires the next X LED CR5 with a repetition of the processing as mentioned for FIGS.
	www.freepatentsonline.com /4645920.html (7550 words)

	Darlington Transistor Array - ULN2803A - TI Product Folder
		The device consists of eight npn Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads.
		The collector-current rating of each Darlington pair is 500 mA.
		The Darlington pairs may be connected in parallel for higher current capability.
	focus.ti.com /docs/prod/folders/print/uln2803a.html (359 words)

	The Official Rusty Wallace Website - Dealerships
		DARLINGTON, S.C. (March 16) - Miller Lite Dodge driver Rusty Wallace is quick to applaud Darlington Raceway officials for the new SAFER (Steel and Foam Energy Reduction system) barriers installed prior to this weekend's Carolina Dodge Dealers 400, but he wonders what the impact will be to an already incredibly narrow groove.
		"The place is already notorious for its wall-whacking and it's bound to be dishing out more 'Darlington Stripes' than ever this time around," said Wallace, who has flirted with victory through the years with a pair of Darlington runner-up finishes and 11 top-five runs overall to his credit entering this weekend.
		Darlington is the sixth track hosting the NASCAR NEXTEL Cup Series to install the SAFER barriers.
	www.rustywallace.com /schedule/2004/march_21_news1.html (617 words)

	United States Patent: 5,500,625
		Transistor 20 may be replaced by a pair of transistors coupled in a Darlington pair as shown in FIG.
		Transistors 136 and 138 are coupled to form a Darlington pair with base turn-off resistor 140.
		Output stage 130 is operable to sink or source a large current on the order of 25 to 30 milliamps due to the combination of sourcing circuit 132, sinking circuit 134, current source 120, and a mirror circuit 148.
	users.ece.gatech.edu /rincon-mora/patents/p5500625.htm (6082 words)

	diyAudio Forums - is darlington pair is unsuitable for audio amplifier?
		DR3 and VHC are all with darlington output
		They need to be rated at 75 watts or higher, 5 amps for higher, and 80 volts or higher.
		Darlingtons arent usually linear enough for audio use.
	www.diyaudio.com /forums/showthread.php?postid=800624 (485 words)

	Crocodile Clips Lesson Activity (Site not responding. Last check: )
		The Darlington Pair basically has three connections and behaves very much like a single transistor.
		A Darlington Pair can be used to increase the overall current gain in a circuit.
		Add a voltmeter to the Darlington Pair to find out what voltage is required at the base of the first transistor to produce switching.
	www.crocodile-clips.com /gpv70/LP/technology/LP0280/LA0280.htm (171 words)

	Circuit Cellar - Digital Library - CCO
		When using these types of devices, one potential problem is the relatively poor ability of the Darlington pair to pull the "on voltage" near the rail.
		Many 5-V relays have a maximum pick-up voltage (the voltage at which the relay is guaranteed to operate) higher than 3.5 V. For example, the Aromat TQ-SMD relays have a maximum pick-up voltage of 3.75 V for the 5-V relay.
		Darlington outputs are widely used in industry and although they are versatile, they do have limitations.
	www.circuitcellar.com /library/details/0999/c99cd5.asp (2005 words)

	Electronic switch (US4556838)
		A regulator monitors the output voltage and controls the duty cycle of a switch providing base drive current to the second transistor of the Darlington pair.
		When the difference between the voltages at the input and output terminals is low, the second switch is closed so that the first transistor is driven by the current through the first switch directly.
		When the difference between the input voltage and output voltage is high, the second switch opens so that the two transistors are operative as a Darlington pair.
	www.delphion.com /details?pn10=US04556838 (302 words)

	Darlington Gain Blocks Eliminate Bias Resistor
		Wideband Darlington RF gain blocks are commonly used in wireless and wire-line applications.
		The Darlington feedback amplifier has evolved from Sidney Darlington's original-US Patent #4,236,119 on a high-current-gain transistor pair into what is now one of the most commonly used topologies in RF-amplifier design.
		The use of the Darlington pair in an RF feedback-amplifier configuration was first employed in silicon-bipolar technology by several commercial companies.
	www.mwrf.com /Articles/ArticleID/11906/11906.html (1048 words)

	Jobs In Darlington - Job Vacancies In Darlington - Job Search Darlington
		darlington county durham tonight, the one that is in the south park?
		Darlington: Where could I find video on the Net for what I think is one of the best finishes in Nascar history?
		Darlington: what is the oldest public house that is trading in darlington county durham england?
	www.jobnut.co.uk /jobs/darlington/index.html (490 words)

	Knowledgebase
		Q1 in figures 1, 5, and 7 refers to the two transistors shown, this is a single Darlington Power transistor.
		It would have been more obvious if we had shown a dotted box around the two transistors to let you know the unidentified transistor is part of the darlington pair.
		The TIP121 is a 5 Amp darlington transistor available from ON Semiconductor and the 2N6044 is an 8 Amp darlington transistor available from several suppliers.
	www.national.com /kbase/category/Automotive.html (336 words)

	The Top 10 at Darlington: Jimmie Johnson - Darlington Raceway
		Johnson swept both races that year at the track "Too Tough To Tame," including the 55th and final running of the legendary Mountain Dew Southern 500 in November.
		In only eight Cup Series starts at Darlington, Johnson has earned a pair of victories, six top 10 finishes, and four finishes in the top five.
		Johnson is pictured here sharing tips for Darlington success with his teammate, Jeff Gordon, during the 2006 Dodge Charger 500 weekend.
	www.darlingtonraceway.com /526957.html (122 words)

	High-Voltage, High-Current Darlington Transistor Array - ULN2004AI - TI Product Folder
		The ULN2004AI is a high-voltage, high-current Darlington transistor array.
		This device consists of seven npn Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads.
		The collector-current rating of a single Darlington pair is 500 mA.
	focus.ti.com /docs/prod/folders/print/uln2004ai.html (391 words)

	Darlington Pair Speed Control - Electronics in Meccano
		The circuit in figure 1 shows a linear potentiometer connected between Vs and 0V such that the voltage at its wiper terminal will always be somewhere at or between these two voltages.
		The small amount of current flowing out of the potentiometer's wiper is amplified by two transistors, connected together in a configuration known as a 'Darlington pair'.
		The current from the potentiometer is amplified by the first transistor, and then again by the second transistor, greatly increasing the amount of current that can be controlled by the potentiometer.
	www.eleinmec.com /article.asp?13 (907 words)

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