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Topic: Darlington transistor

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	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.
		The idea of putting two or three transistors on a single chip was patented by him, but not the idea of putting an arbitrary number of transistors, which would cover all modern ICs.
		A Darlington pair is sufficiently sensitive to respond to the small current passed by your skin and it can be used to make a touch-switch.
	en.wikipedia.org /wiki/Darlington_transistor (369 words)

	Transistor - Wikipedia, the free encyclopedia
		The transistor is considered by many to be one of the greatest inventions in modern history, ranking in importance with inventions such as the printing press, the automobile and the telephone.
		Transistorized circuits are replacing electromechanical devices for control of appliances and machinery as well, because it is often less expensive and more effective to simply use a standard integrated circuit and write a computer program to carry out the same mechanical task using electronic control than to design an equivalent control function mechanically.
		Subsequently, transistors and other components and their necessary wiring were integrated into a single, mass-manufactured component: the integrated circuit.
	en.wikipedia.org /wiki/Transistor (2888 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-10-20)
		The Darlington transistor pair may be configured to generate an output signal in response to an input signal.
		The first common-base transistor may be coupled between the Darlington transistor pair and the output signal.
		Such a Darlington pair configuration may further reduce the impedance presented to the base of the transistor Q22'such that a higher output breakdown voltage of the circuit 300 may be attainable when compared to conventional approaches.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/107529.031224&ELEMENT_SET=DECL (3547 words)

	Darlington Pair Transistor Breadboard Project
		When a single transistor is used in the circuit, as seen earlier, the LDR has to be completely covered before the LED lights.
		This is because the circuit lacks sensitivity as the current into the base of the transistor is quite weak.
		A darlington pair is needed to amplify the current and this is achieved by the first transistors emitter feeding into the base of the second transistor.
	www.technologystudent.com /elec1/tranbrd2.htm (123 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-10-20)
		The use of the inventive transistor in a Darlington configuration may be suitable to obtain higher gains; however, the principle of the invention may be applied to a single transistor of the Darlington configuration.
		The improved Darlington structure according to the present invention do solves the technical problem and reached various advantages the first of which is given on the fact that, inside a single integrated power circuit, a simple and efficient driving circuit is obtained for the transistor or the transistors Darlington structure.
		Improved bipolar transistor structure (1) of the type having conventional base (B), collector (C) and emitter (E) terminals, characterised by comprising an integrated thyristor device (3) SCR between the base (B) and the emitter (E) of the transistor structure.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/73509.030904&ELEMENT_SET=DECL (2527 words)

	Darlington transistor - Patent 4136355
		The Darlington transistor comprising a first transistor of smaller output, i.e., a driving transistor Tr1 and a second transistor, i.e., an output transistor Tr2 of larger output, connected by their collectors in common and by the emitter of the first transistor Tr1 to the base of the second transistor Tr2.
		In the first transistor Tr1, the base electrode 16 is formed in an opening in the emitter electrode 15, and the emitter electrode 15 is formed in a manner that at least an extended part 15' of it contacts the base region 17' of the second transistor Tr2.
		In manufacturing process of the Darlington transistor of this example, the obstruction region 201 and the auxiliary obstruction region 20' are formed by a separate diffusing step from that of forming the emitter regions 13 and 13'.
	www.freepatentsonline.com /4136355.html (4534 words)

	PS-2 Power Supply documentation -- Electronic Fabrication (Site not responding. Last check: 2007-10-20)
		The Darlington is required to multiply the op-amp output current to the desired output level.
		The pass transistors are paralleled to permit higher output currents than would be possible with a single pass element.
		In this case, all high current wiring should be from the bridge output to this capacitor and the collector of the pass transistor and from the emitter of the pass transistor to R4, R5 and the output connector.
	www.austin.cc.tx.us /cloud/ps2/p2a.htm (1795 words)

	Encyclopedia: Darlington transistor (Site not responding. Last check: 2007-10-20)
		This is two transistors connected together so that the current amplified by the first is amplified further by the second transistor.
		Sidney Darlington (July 18, 1906 - October 31, 1997) was a famous electrical engineer who invented the transistor-configuration named after him, the Darlington transistor.
		Compound-pair transistor configuration The compound transistor or compound-pair transistor configuration consists of a pair of complementary bipolar transistors connected such that the base and collector of the second transistor are connected to the collector and emitter of the first, respectively.
	www.nationmaster.com /encyclopedia/Darlington-transistor (540 words)

	Transistors
		Transistor is a solid-state electronic device composed of semiconductor material, such as germanium, silicon, etc., that controls current flow without the use of a vacuum.
		Transistors are similar in function to electron tubes, but have the advantage of being compact, long-lived, and low in power requirements.
		Field-effect transistor (FET), is a type of transistor that has its output controlled by an electric field and is used to amplify a signal.
	www.eidusa.com /Electronics_Transistors.htm (82 words)

	Bipolar Junction Transistors
		High power bipolar transistors are conceptually the same as the bipolar transistors described in chapter 8.
		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.
		Furthermore, since both transistors are in saturation in the on state, a significant amount of minority carriers are accumulated in the base region of each transistor.
	ece-www.colorado.edu /~bart/book/book/chapter5/ch5_9.htm (1430 words)

	Darlington transistor -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-20)
		This gives it high current (The amount by which the revenue of a business exceeds its cost of operating) gain (commonly written β), and takes up less space than using two discrete transistors in the same configuration.
		It has more phase shift at high frequencies than a single transistor, and hence can become unstable with negative (The process in which part of the output of a system is returned to its input in order to regulate its further output) feedback much more easily.
		The base-emitter voltage is also higher; it is the sum of both base-emitter voltages and for silicon-transistor >1.2 V. This configuration (originally realized as two separate transistors) was invented by (Click link for more info and facts about Bell Laboratories) Bell Laboratories engineer (Click link for more info and facts about Sidney Darlington) Sidney Darlington.
	www.absoluteastronomy.com /encyclopedia/d/da/darlington_transistor.htm (174 words)

	Transistor de Darlington - Wikipédia
		Le transistor Darlington est la combinaison de deux transistors bipolaires de même type (tous deux NPN ou tous deux PNP), résultant en un composant hybride qui a encore des caractéristiques de transistor.
		Ces 2 transistors peuvent être intégrés ou non dans un même boîtier.
		Le gain en courant du Darlington est égal au produit des gains de chaque transistor.
	fr.wikipedia.org /wiki/Transistor_de_Darlington (241 words)

	Darlington transistor arrangement - Patent 4905069
		In the particular embodiment described in the specification, a Darlington transistor arrangement has a stepped upper surface with an emitter terminal of the preceding transistor disposed at the bottom of a groove formed between spaced raised portions on which the collector terminal and the emitter terminal of the transistor are located.
		Moreover the surface on which the base terminal is located is disposed outside the collector and emitter terminal locations on the transistor body and the surface at which the emitter terminal of the preceeding transistor is situated is located between the surfaces at which the collector terminal and the emitter terminal are situated.
		Where these four terminals, B, C, E and BO, of a Darlington transistor are arranged on the upper surface of a Darlington transistor body which is joined at its lower surface to a heat sink body, an arrangement of the type shown in FIGS.
	www.freepatentsonline.com /4905069.html (1015 words)

	Use of a ULN2429 Fluid Detector
		Thus, the base of the output Darlington stage is near 0 and the output Darlington transistor is off (open).
		Thus, in the arrangement in Figure #1a, the presence of a conductive fluid between probe points A and B causes the output transistor to turn on.
		Aside from the logic inversion, there is a possible advantage in the arrangement in Figure #1b in that by having one of the probe terminals at ground, one can simply ground the vessel holding the fluid and then run only the B lead to detect the level as shown in Figure #2.
	www.phanderson.com /printer/fluid/fluid.html (616 words)

	Transistor Circuits
		When a transistor is saturated the collector current Ic is determined by the supply voltage and the external resistance in the collector circuit, not by the transistor's current gain.
		A transistor can also be used to enable a chip connected to a low voltage supply (such as 5V) to switch the current for an output device with a separate higher voltage supply (such as 12V).
		If the transistor is switching a load with a coil, such as a motor or relay, remember to add a protection diode across the load.
	www.kpsec.freeuk.com /trancirc.htm (2212 words)

	Addition of a Darlington pair (Site not responding. Last check: 2007-10-20)
		Adding a second transistor Q2 as shown reduces the amount of base current required to operate the transistor.
		A configuration such as Q1 and Q2 can be thought of as a single transistor with a super b and that transistor is referred to as a Darlington transistor.
		Such transistors are commonly made and the transistors are usually close to identical.
	scitec.uwichill.edu.bb /cmp/online/el22c/Chapter18/Lecture_E_Power_Supplies/Slides/AdditionofaDarlingtonpairSlide1.htm (133 words)

	diyAudio Forums - Transistor relay circuit
		I like using darlington transistors for switching motors or coils on and off because it uses very little current to turn on the transistor.
		I was not suggesting to use transistor in the signal path.
		This has to be used as a transistor switch instead of mechanical switch which generates noise.
	www.diyaudio.com /forums/showthread.php?postid=23037 (1139 words)

	Can use a darlington (Tip110) as a switch ?
		You are using the transistor as an emitter follower.
		That is ground the emitter and put the load between the 12V and the collector of the transistor.
		One easy way for this is to use a npn transistor emitter grounded and collector to two resistors in series to 12V.
	www.edaboard.com /ftopic77657.html (896 words)

	Transistor Darlington (Site not responding. Last check: 2007-10-20)
		When you are trying to find high-class information on Transistor Darlington, it'll be complex separating value packed information from amateurish Transistor Darlington proposals and help so it is wise to recognize ways of judging the information you are offered.
		A good hint to follow when offered help or advice about a Transistor Darlington site is to verify the ownership of the website.
		This may reveal the operators Transistor Darlington qualifications The fastest way to determine who owns the Transistor Darlington website is to look on the 'contact' page or 'about this site' information.
	www.electronics-facts.info /transistors/Transistor-Darlington.htm (206 words)

	Darlington transistor: Definition and Links by Encyclopedian.com - All about Darlington transistor
		Darlington transistor: Definition and Links by Encyclopedian.com - All about Darlington transistor
		In electronics, the Darlington transistor is a semiconductor device which combines two bipolar transistors in tandem in a single device.
		This gives it high gain, but takes up less space than using two discrete transistors in the same configuraton.
	www.encyclopedian.com /da/Darlington-transistor.html (86 words)

	Darlington transistor (Site not responding. Last check: 2007-10-20)
		The total gain of the darlington is the product of the gain of the individual transistors.A typical modern device has a current gain of 1000 or more.
		The base-emitter voltage is also higher; it is the sum ofboth base-emitter voltages and for silicon-transistor >1.2 V. This configuration (originally realized as two separatetransistors) was invented by Bell Laboratories engineer Sidney Darlington.
		The idea of putting two or three transistors on asingle chip was patented by him, but not the idea of putting an arbitrary number of transistors, which would cover all modern ICs.
	www.therfcc.org /darlington-transistor-45813.html (172 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.
		Because the output transistor in a Darlington is never driven hard into saturation, the output is only pulled within 1.2–2.5 V of the rail, depending on I
		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)

	Application Darlington Transistor (Site not responding. Last check: 2007-10-20)
		When you are looking for the best advice about Application Darlington Transistor, you will find it hard unscrambling quality advice from inexpert Application Darlington Transistor suggestions and directions so it is important to recognize how to moderate the information you are offered.
		A great tip to pursue when you're presented with help or advice about a Application Darlington Transistor website is to verify the ownership of the website.
		This may show you who owns the site Application Darlington Transistor identifications The fastest way to determine who owns the Application Darlington Transistor website is to look on the 'contact' page or 'about this site' information.
	www.electronics-facts.info /transistors/Application-Darlington-Transistor.htm (229 words)

	Product Folder : SN75469 - High-Voltage, High-Current Darlington Transistor Arrays
		The SN75468 and SN75469 are monolithic high-voltage, high-current Darlington transistor arrays.
		The collector-current rating of each Darlington pair is 500 mA.
		The Darlington pairs may be paralleled for higher current capability.
	focus.ti.com /docs/prod/folders/print/sn75469.html (391 words)

	Datasheet catalog for electronic components integrated circuit, transistor, diode, triac, and other semiconductors.
		Darlington Transistors - NPN Silicon Darlington Transistor for general AF applications
		Darlington Transistors - PNP Silicon Darlington Transistor for general AF applications
		Dual Transistors - NPN Silicon Double Transistor to be used as a current mirror
	www.datasheetcatalog.com /catalog/28420.shtml (88 words)

	Product Folder : ULN2004AI - High-Voltage, High-Current Darlington Transistor Array
		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 (382 words)

	CentralSemi.com (Site not responding. Last check: 2007-10-20)
		The Central Semiconductor CZT2000 is an NPN Epitaxial Planar Silicon Darlington Transistor manufactured in an epoxy molded surface mount SOT-223 package, designed for applications requiring extremely high voltages and high gain capability.
		The Central Semiconductor power components are surface mount SOT-223 epoxy molded complementary silicon transistors manufactured by the epitaxial base process designed for surface mounted power amplifier applications from 3 to 6 amps.
		The Central Semiconductor CZT122 and CZT127 are Complementary Silicon Power Darlington Transistors, designed for low speed switching and amplifier applications, available in a space saving SOT-223 surface mount package.
	www.centralsemi.com /whatsnew/feature/featuredeschoice10a.aspx (249 words)

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