
	Where results make sense

Topic: Photo transistor

Related Topics

Photodiode

Floppy disk drive

Avalanche photodiode

Photodetector

Propeller wind generator

Darlington transistor

Thyristor

Floppy disk

Electronics

Flippy disk

Propellor

Fan (implement)

Rocket

Commodore 128

Water wheel

	Radio-Electronics.Com :: Photo transistor (Phototransistor)
		The base of the photo transistor would only be used to bias the transistor so that additional collector current was flowing and this would mask any current flowing as a result of the photo-action.
		Another form of photo transistor that is often seen and belongs to the same family is called the Darlington phototransistor, or photodarlington.
		It is essentially a pair of transistors in a Darlington arrangement where the first transistor acts as the photodetector, and its emitter is coupled into the base of the second transistor.
	www.radio-electronics.com /info/data/semicond/phototransistor/photo_transistor.php (954 words)

	Photo Ics, Hamamatsu
		Photo IC for synchronous detection of an optical signal in the presence of backgound such as bright sunlight.
		Photo IC for synchronous or asynchronous detection of an optical signal in the presence of backgound such as bright sunlight.
		Photo IC for synchronous or asynchronous detection of an optical signal in the presence of background such as bright sunlight.
	sales.hamamatsu.com /en/products/solid-state-division/photo-ic-series/photo-ic.php (749 words)

	Transistor Museum Photo Gallery Bell Labs Type A First Point Contact Transistor
		[1], a metal cartridge version of the original point contact transistor was developed at Bell Labs in the early months of 1948, only a few months after the invention of the transistor.
		This first cartridge version of the transistor was designated “Type A’, and represents the earliest developmental transistor which was robust enough to be manufactured in quantity (3700 by mid-1949) - many were made available (for experimentation and circuit development) to other companies, universities and the military.
		As shown in the photos above, each unit was serialized and the measured performance characteristics of the device were written on the cardboard packaging.
	semiconductormuseum.com /PhotoGallery/PhotoGallery_TypeA.htm (215 words)

	[No title]
		The medium sensitivity device is the Photo Transistor and the high sensitivity devices are the LASCR, Photo FET and Photo Darlington transistor.
		Both photo-transistors and photo-diodes can have two leads as the base of a photo transistor is not connected to an outside circuit and thus it is not brought out of the package.
		Sometimes a second transistor is also mounted inside the case and it amplifies the change in resistance to produce a more-sensitive device.
	www.talkingelectronics.com /Pay/BEC-3/Page51.html (1396 words)

	Antique Radio Classified: Vintage Transistor Radios
		Although there were working demonstrations of the potential uses of the transistor presented to the audience (audio oscillator, audio amplifier, and radio receiver), no one present could have known or reasonably predicted the tremendous impact that this device would have on technology over the next 50 years.
		The transistor developed by Bell Labs in 1947 was of the type known as "point contact." This term refers to the technique used to attach two fine wires as points of contact to a germanium block, as shown in Figure 1.
		The junction transistor was constructed using a die or chip of germanium, with transistor action accomplished by any of several different manufacturing techniques, such as adding controlled amounts of impurities to the germanium -- the point contacts, with their inherent drawbacks, had been eliminated.
	www.antiqueradio.com /ward_history_12-98.html (2501 words)

	Electronic bicycle odometer and speedometer - Patent 4156190
		Photo transistor 25 is mounted within bracket 26 upon leg 21 in alignment with the light beam emitted from LED 23.
		The signals generated by photo transistor 25 as a result of repetitive interruptions of the light beam from LED 23 are transmitted to computation circuit 27, which circuit may be mounted upon plate 16, as illustrated.
		Thus, when photo transistor 25 receives light energy from LED 23, the output voltage V.sub.O of sensor circuit 28 will be at a voltage level approximately equal to that of the supply voltage.
	www.freepatentsonline.com /4156190.html (3090 words)

	Rotation detector - Patent 4418288
		Additionally, the resistors 22 and 24 are connected to the base of a transistor 26, the collector of which is connected to an anode of the battery 18 and an emitter of which is connected to the cathode of the battery 18, respectively.
		As a result, the photo-transistor 10 is brought into a saturated state, whereby the switching transistor 26 is also brought into a saturated state, so that the level of signal at the output end 30 is rapidly transferred from the mean level to a logical "0" level.
		As a result, the photo-transistor 10 and the switching transistor 26 are brought into the cut-off states, so that the level of signal at the output end 30 is rapidly transferred from the mean level to logical "1" level.
	www.freepatentsonline.com /4418288.html (2964 words)

	Datasheet catalog for electronic components integrated circuit, transistor, diode, triac, and other semiconductors.
		Photo transistors(high-sensitivity NPN silicon phototransistors mounted in durable)
		Photo transistors(high-sensitivity NPN silicon phototransistor mounted in a clear sidelooking)
		Photo transistors(a high-sensitivity NPN silicon phototransistor mounted in a clear sidelooking)
	www.datasheetcatalog.com /catalog/p888480.shtml (112 words)

	Transistor
		A study of the transistor and simple solid-state devices and circuits is appropriate in an introductory physics class.
		When using an NPN transistor, the collector is made positive with respect to the emitter as shown in the diagram.
		The physics of the amplification of current in the transistor is described as follows: When the base is open and the collector positive with respect to emitter, the reversed biased base-collector junction prevents any current flow.
	www.warren-wilson.edu /~physics/physics1/ActivityGuides/Transistor/transistor.html (1237 words)

	RCA CED Player Diode and Transistor Reference Guide
		These two transistors are by far the most common, being used a number of times in any given player, while the more exotic transistors, like the programmable unijunction and hall effect latch types are used only once or twice.
		Bipolar junction transistors perform the function of amplification where a small varying voltage or current applied to the base (the lead on the left side of the symbol) is proportionately replicated by a much larger voltage or current between the collector and emitter leads.
		The unijunction transistor is more like a diode than a transistor in that the voltage on the emitter (the lead with the arrow) determines whether current flows from the lower base lead (B1) to the emitter.
	www.cedmagic.com /tech-info/rca-diode-transistor.html (1475 words)

	Transistor
		The transistor was invented at Bell Laboratories in December...
		A transistor is a small electronic device that can cause changes in a large electrical output signal by small changes in a small input signal.
		Transistors are either NPN or PNP in the configuration of the layers.
	www.101science.com /transistor.htm (599 words)

	Light-responsive light-emitting diode display - Patent 4329625
		In the case of a narrow gate-to-gate interval, the current gain exhibits a characteristic analogous to the current gain exhibited by a bipolar transistor, and this characteristic of current gain is substantially constant for a considerably broad range of gate voltage applied.
		In the case of a large gate-to-gate interval, the current gain is relatively constant as in the case of narrow gate-to-gate interval, in the operating region where the drain current is large.
		It should be noted, however, that this transistor can be made to act like an ordinary field effect transistor depending on the design parameters such as the impurity concentration and dimensions of the channel region.
	www.freepatentsonline.com /4329625.html (8305 words)

	Transistor
		The earliest junction transistors were made using molded plastics but it was soon discovered that this contributed to early device failure due to contamination by moisture.
		Sylvania transistors initially became available in early 1955 and the 2N94 was among the first transistors to operate reliably at radio frequencies.
		From l to r: a rare CK740 diode (constructed in a half-size CK series transistor case) from 1954, a 782 hearing aid transistor from 1956, a 2N138 from 1957, a CK768 from 1956 and finally a CK721 from 1953 (shown in a sub miniature hearing aid tube socket).
	users.arczip.com /rmcgarra2/xstr.html (6155 words)

	[No title] (Site not responding. Last check: )
		Photo Transistor는 pn 접합의 2극 소자인 것과, npn 접합의 3극 소자인 것이 있는데, 최근의 Photo Transistor는 증폭 작용이 있는 npn 접합이 주로 사용되고 있다.
		보통의 Transistor인 경우에는 베이스 전극이 필요하지만 Photo Transistor인 경우에는 빛이 베이스 전류를 대신하기 때문에 전극이 없는 것이 많다.
		Photo Transistor의 수광감도는 파장이 약 8000Å 근처일때 가장 좋은 효율을 갖기 때문에 GaAs발광 다이오드, 또는 텅스텐 램프가 가장 효율 좋은 빛 에너지의 변환을 수행한다.
	www.roboblock.co.kr /info/mp2-98.htm (118 words)

	PHOTO TRANSISTOR (Site not responding. Last check: )
		Photo transistor Therapy Medical Social Services Home Health Care Programs LTHHCPs should project operational costs for the purposes of this study, home nurse visit returned to the photo transistor...
		High sensitivity photo transistor Where appropriate, we may need to send revised work high sensitivity photo transistor for which the controlling person managers, directors, principal members and the...
		Germanium Photo Transistor Vintage: 1956 Donated by : Dennis Uhlich General Transistor Corporation was a premier manufacturer of germanium alloy junction transistors in the latter part of the 1950s.
	www.transeuropamusic.de /phototransistor (262 words)

	Experimental Determination of g
		Two are connected to the infra-red LED and two to the photo-sensitive transistor.
		For the infra-red LED (blue casing), the fl wire is wired to the cathode and the white wire to the anode.
		For the photo-sensitive transistor (clear casing), the fl wire is wired to the emitter and the white wire to the collector.
	www.physics.utoledo.edu /~alukasz/measure_g.htm (1142 words)

	Transistor Museum Photo Gallery Raytheon CK311 Germanium Alloy Junction Power Transistor
		The Raytheon CK311 is a unique vintage germanium power transistor in several respects.
		Most interesting is the fact that this device was sold in a vacuum tube cardboard package – this occurred very early in transistor history, when a few of the first transistor manufacturers used existing tube boxes for their first transistors, but the CK311 was sold in the 1960s, about a decade after the first transistors.
		Another interesting feature of the CK311 is that it is a relabeled CBS transistor (2N156 style), and reflects the fact that Raytheon had bought the CBS Hytron company in the late 1950s and continued to manufacture the existing CBS transistors.
	semiconductormuseum.com /PhotoGallery/PhotoGallery_CK311.htm (175 words)

	Transistor Museum Photo Gallery Sony 2T76 Germanium Grown Junction Transistor
		Transistor Museum Photo Gallery Sony 2T76 Germanium Grown Junction Transistor
		The Japanese company Sony was an early manufacturer of germanium transistors.
		The first commercial quality Sony germanium transistors were of the grown junction type, which had been developed originally at Bell Labs in 1951.
	semiconductormuseum.com /PhotoGallery/PhotoGallery_2T76.htm (156 words)

	Transistorized! The History of the Invention of the Transistor, Photo Credits
		All Photos Courtesy American Institute of Physics: Emilio Segre Visual Archives Except Where Noted
		Gordon Moore from Transistorized!, ©1999 Twin Cities Public Television, Inc. and ScienCentral, Inc.
		Betty Sparks from Transistorized!, ©1999 Twin Cities Public Television, Inc. and ScienCentral, Inc.
	www.pbs.org /transistor/photocredits.html (500 words)

	Adjusting Sensitivity of Photo Transistor? - Electronic Circuits Projects Diagrams Free
		I have been using photo transistors lately as part of a laser beam detector device.
		The laser has to be directly into the transistor for it to turn on.
		In the past I would always just connect a resistor to either P or N and the other end of the resistor to the base of the transistor to turn it on or off.
	www.electro-tech-online.com /general-electronics-chat/16226-adjusting-sensitivity-photo-transistor.html (934 words)

	Transistor Tester On B2BManufactures.Com from China & Taiwan Transistor Tester Manufacturers & China Transistor Tester ...
		They supply top quality transistor tester with their own brand names or for OEM, ODM, custom-made and contract manufacturing services.
		PTS-600 is a tester designed ot test photo diode and photo transistor.
		Transistor Tester - Wei Min Industrial Co., Ltd.
	www.manufacturers.com.tw /electronics/transistor-tester.html (168 words)

	Expert Calls Bell Labs "1947 Transistor Photo" FAKE!
		It depicts a high voltage rectifier prototype (a diode or triode), probably from 1943, and it has a small vacuum chamber embedded in its center, implying it is a microwave-use device.
		As verification, the Forensic scientist included a stunning photo of alleged Bell Transistor inventor, William Shockley working at a flboard during the era.
		It has been suggested that the photo in Figure 3, and the drawing on the flboard, appear to not only resemble the Test Rig in Figure 2, but it also looks like an actual transistor as might be found today.
	www.fortunecity.com /greenfield/swampy/1/transistor.htm (576 words)

	Phototransistors (Site not responding. Last check: )
		Phototransistors are designed specifically to take advantage of this fact.
		The most-common variant is an NPN bipolar transistor with an exposed base region.
		Here, light striking the base replaces what would ordinarily be voltage applied to the base -- so, a phototransistor amplifies variations in the light striking it.
	encyclobeamia.solarbotics.net /articles/phototransistor.html (155 words)

	CR4 Photo Album
		This photo was included to show the dramatic difference in altitude between the F-motors and the H-motors in this rocket.
		These were scanned at 300 dpi for high-resolution, reduced by 50% (effective 150 dpi) for medium-resolution, reduced by 50% again (effective 75 dpi) for low-resolution, and reduced by 50% yet again (effective 37.5 dpi) for thumbnail-resolution.
		Construction details and photos, as well as photos of the completed rocket can be accessed at CR4 Construction.
	home.neo.rr.com /rocketman/rockets/cr4/photo.htm (707 words)

	Model Railroad and Misc. Electronics
		The circuit uses six photo transistors to control the operation of the flashers and can easily supply up to four sets of LED flashers (8 LEDs).
		This page features a photo and schematic from an article that was published in the August 1994 issue of Model Railroader Magazine.
		The basic transistor throttle serves as a base to which other circuits are added.
	home.cogeco.ca /~rpaisley4/CircuitIndex.html (3837 words)

	Photodiode : Photo transistor
		Circuits based on this effect are more sensitive to light than ones based on the photovoltaic effect.
		A phototransistor is in essence nothing more than a normal bipolar transistor that is encased in a transparent case so that light can reach the Base-Collector diode.
		The phototransistor works like a photodiode, but with a much higher sensitivity for light, because the electrons that tunnel through the Base-Collector diode are amplified by the transistor function.
	www.wordlist.org /ph/photo-transistor.html (409 words)

	Paragon Photo Controls
		Our Photo Controls provide illumination all night and save energy all day.
		Your applications shine from dusk until dawn when light is needed.
		Conduit-wired photo controls all available with 510 CAD sulfide cell bi-metallic switch that eliminates false switches traditional 4 to 1 ON/OFF ration.
	www.icca.invensys.com /paragon/photocontrols.htm (341 words)

	Prix du matos : Home-cinéma, DVD, Photo numérique, Informatique - Lexique
		Element electronique fondamental dans "tout" amplificateur, c'est l'element semiconducteur qui permet d'amplifier un courrant.
		- BJT : bipolar jonction transistor, ce sont les transistors les plus classiques que l'on retrouve dans la plus part des amplificateurs entree millieu voir meme haut de gamme, ils sont commandé en courrant, donc, le transistor envoies en sortie le courrant d'entrée multiplié d'un facteur Beta qui determinera le gain de l'amplificateur.
		le transistor est le sucesseur des lampes, ce dernier se distingue du fait que la tention de polarisation est plus basse et que il ne nécessite pas de chauffage.
	www.prixdumatos.com /lexique.php (1501 words)

	Cell library for PREMA ASICs with photo diodes, hall sensors
		NPN and PNP standard transistors, NPN-HV and PNP-HV high voltage transistors, and NPN-VHV and PNP-VHV very high voltage transistors with a breakdown voltage of V
		Junction field effect transistors (JFETs) with a breakdown voltage of 35 Volts and threshold voltages between 600 and 1000 mV.
		Photo transistors with maximum sensitivity in the visible range.
	www.prema.com /Design/cell-library.html (211 words)

Try your search on: Qwika (all wikis)