Laser Diode Pin

Testing the polarity of a dvd diode?

I have been attempting to build the laser based on this video:

I have all of the needed parts and even extracted a diode from my old dvd/cd drive. However, I'm new to this kind of build and I do not know how to test the diode for its positive and negative pins. I'm not even sure if this diode works because of my "less than gentle" removal process... Please help with this!

In the YouTube video, two AA cells are directly connected to the diode. So the way to test for polarity is to series-connect the two AA cells (3.0V total) to two pins at a time and use trial-and-error. There are six combinations to try. Only two pins, when connected correctly will cause the diode to light. With all other connections, the diode will be dark. You won't hurt the diode with 3.0V if you hook the 3.0V up backwards, so trial-and-error is an okay way to determine the proper connections.

Laser Diode Microsystems $301.11 Laser Diode Microsystems provides the reader with the basic knowledge and understanding required for using semiconductor laser diodes in optical microsystems and microoptical electromechanic systems. This tutorial addresses the fundamentals of semiconductor laser operation and design, coupled with an overview of the types of laser diodes suitable for use in Microsystems, along with their distinguishing characteristics. Emphasis is placed on laser diode characterization and measurement as well as the assembly techniques and optical accessories required for incorporation of semiconductor lasers into complex microsystems. Equipped with typical results and calculation examples, this handon text helps readers to develop a feel for how to choose a laser diode, characterize it and incorporate it into a microsystem. Author: Zappe, Hans P./ Zappe, H. Series Title: Microtechnology and Mems (Hardcover) Binding Type: Hardcover Number of Pages: 355 Publication Date: 2003/10/10 Language: English Dimensions: 9.21 x 6.14 x 0.81 inches

Dime Used to Illustrate Miniature Size of the Diode of an Injection Laser $79.99 Dime Used to Illustrate Miniature Size of the Diode of an Injection Laser - Premium Photographic Print

Study of Laser Diode and Edfa $111.53 This book basically gives the over view about The properties of erbiumdoped fiber amplifier (EDFA) such as gain and noise figure have been studied. By determining the characteristics of the 980nm, 1480nm 1550nm laser sources and ASE (amplified spontaneous emission) at the output of the amplifier used to determine the gain and noise figure of EDFA. This model allows to follow the signal (1550nm), pump (980nm) and ASE as they propagate along the fiber and determine population inversion .The both forward and backward propagation ASE are important in determining the overall gain and noise figure. For the amplification of more than 80 channels the DWDM (Dense Wavelength Division Multiplexing) has required CBand (15251565)nm and LBand (15651610)nm EDFA.We show that a flat gain spectrum can be achieved in the range from 1565 to 1610 nm when the EDF length, pump power and pump configuration are appropriately chosen. Special care must be taken when selecting the EDF length. Author: Kumar, Pankaj/ Kumar, Chakresh/ Chack, Devendra Binding Type: Paperback Number of Pages: 68 Publication Date: 2011/06/19 Language: English Dimensions: 9.02 x 5.98 x 0.16 inches

Monolithic Diode-Laser Arrays $79.9 No Synopsis Available

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Laser Diode Modulation and Noise $145.28 No Synopsis Available

CET Domain 10021910 Playstation 3 Compatible Laser Diode $72.83 Replace your damaged laser diode built for Playstation 3 KEM400AAA and KES400AAA laser lenses. Use and replace your laser diode with precaution. All laser diodes are extremely ESD sensitive. Compatible Models: Playstation 3 compatible KEM400AAA and KES400AAA laser lenses (sold seperately). Note: Installation guide is not included' please look for it online or use the help of an accreditate technician. We will not be responsible for any damage of your device due to improper installation. This item takes between 721 days to ship/arrive because it ships out of Hong Kong or China.

Cet 10021911 Playstation 3 Compatible 410 Series Laser Diode $46.28 Replace your damaged laser diode built in your PlayStation 3 KEM410 and KES410 laser lens. Use and replace your it with precaution as this laser diode is very fragile and extremely ESD sensitive. Compatible Models: Playstation 3 compatible KEM410 and KES410 laser lenses (not included). Note: Installation guide is not included' please look for it online or use the help of an accreditate technician. We will not be responsible for any damage of your device due to improper installation. This item takes between 721 days to ship/arrive because it ships out of Hong Kong or China.

Simulation of Ingan Blue Laser Diode $172.06 In this book, the design of InGaN LDs structures including multi quantum wells (MQWs) active region device are described and investigated by integrated system engineering technology computer aided design (ISE TCAD) device simulator. The parameters of the LDs structures are varied and optimized for high performance. This optimization study involves aspects such as thickness of active region, doping, thickness of stopper layer region, thickness of quantum wells and quantum barriers, number of quantum wells and several approaches to improve and achieve high efficiency, low threshold current and high output power of InGaN LDs. The basic LDs structures treated here are FabryPerot type InGaN double heterostructure (DH), separate confinement heterostructure (SCH) and multi quantum wells (MQWs).High performance LD has been obtained by using multi quantum wells incorporated with the optimized parameters. The lowest threshold current, higher external quantum efficiency and characteristic temperature are obtained when the number of InGaN well layers is two, at our laser emission wavelength of 415 nm, which is related to the problem of inhomogeneous carrier. Author: Thahab, Sabah Binding Type: Paperback Number of Pages: 232 Publication Date: 2011/01/31 Language: English Dimensions: 5.98 x 9.00 x 0.53 inches

Diode Laser and Naocl as Root Canal Disinfectant $111.53 Enterococc faecalis considered to be the mostresistant bacteria of the root canal, in the presentstudy we used two types of root canal disinfectant toshow their effect on this type of bacteria, the firstis the diode laser and the second NaOCl solution withspecial concentrations and times. the study conductedon human decoronated extracted teeth, adjusted with13mm root length, filled with a suspension of E.faecalis, Samples were divided into 14 groups eachgroup consisted of 10 prepared roots, sixty sampleswere irrigated with NaOCl solution at differentconcentrations (0.5, 2.5 and 5.25) at twoselected times (2 minutes and 5 minutes) for eachconcentration.Sixty samples were irradiated at different powers (2W, 2.5W and 3W); each power at thetotal irradiation time 30 and 60 seconds. Whencomparison was made between NaOCl irrigant and diodelaser in a combination among differentconcentrations, powers and times the result showedthat 5.25 NaOCl at both 2 minutes and 5 minutes hadthe highest antimicrobial effect with no significantdifferences from 3W laser / 10 sec (6 cycles) butsignificantly different from 3W / 5 sec (6 cycles). Author: Shehab, Najwan F./ Zakaria, Assistant Prof Nawfal a./ Taha, Prof Dr Mahmoud y. Binding Type: Paperback Number of Pages: 104 Publication Date: 2011/07/29 Language: English Dimensions: 9.02 x 5.98 x 0.25 inches

The Blue Laser Diode: The Complete Story $233.03 No Synopsis Available

R500 650nm 500mw Red laser light, laser diode $195.88 It's widely used in scientific research, laser printing, spectrum analysis, laser show, etc.

Laser Diode Beam Basics, Manipulations and Characterizations $48.7 No Synopsis Available

High Power Diode Lasers: Technology and Applications $511.65 This book summarizes a five year research project, as well as subsequent results regarding high power diode laser systems and their application in materials processing. The text explores the entire chain of technology, from the semiconductor technology, through cooling mounting and assembly, beam shaping and system technology, to applications in the processing of such materials as metals and polymers. Includes theoretical models, a range of important parameters and practical tips. Author: Bachmann, Friedrich/ Loosen, Peter/ Poprawe, Reinhart Series Title: Springer Series in Optical Sciences Series Number: 128 Binding Type: Paperback Number of Pages: 560 Publication Date: 2010/11/29 Language: English Dimensions: 9.21 x 6.14 x 1.14 inches

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Pyle LAN Tester,Multimeter and Diode Tester $110.8 2 in 1 LAN Tester and Multimeter with Voltage, Current, Resistance, Continuity, and Diode Tester Tests Pin Configuration for 10 Base-T, 10 Base-2, RJ45/RJ11, 356A, TIA-569A/568B and Token Ring Cable Remotely Test Cables Up to 330 Yards Away Test Ground Wire Measure DC/AC Voltage, DC/AC Current, Resistance, Continuity, and Diode DC Voltage: Max Range 600 V, Accuracy +/- 0.5% AC Voltage: Max Range 600 V, Accuracy +/- 1.2% DC Current: Max Range 200 mA, Accuracy +/- 1.2% AC Current: Max Range 200 mA, Accuracy +/- 2.0% Resistance: Max Range 20 MO, Accuracy +/- 0.8% Continuity Test: Beeps If Less Than 100 O Accessories Included: Test Leads, LANtest Remote Terminator, 9V Battery, Carrying Case Dimensions: 6.38" H x 2.93" W x 1.73" D Weight: 10.86 oz.

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JVC VCR Problems In Model HR-J321EM-No Power

A customer sent me a JVC HR-J312EM model VCR for repair. The complaint was no power. I personally don’t repair VCR because I’m more on computer monitor repair. Because of he is a friend of mine; I told him that I’m willing to take the challenge to repair it. Repairing VCR at my era actually has begun to go obsolete because of the market filled with VCD players. VCD player is cheaper than VCR and compact in term of the size. Back then, many people sent their compact disc and laser disc players to electronic repair shop to convert the players into VCD player.

What the technicians do was to add in a mpeg or VCD card and tapped the EFM RF signal from the DSP ic. When you buy the VCD card, it came along with a list of the DSP ic part numbers and pin out and shown you at where you suppose to tap the signal. It was a 15- 20 minutes job and you could earn a lot from it. But now, everyone is using DVD player and VCD already obsolete.

Come back to the VCR player, after opened up the casing and placed my probe on the two pins of the main filter capacitor, I could see the capacitor still holding the charge. If the voltage present at the capacitor pins, this tells us that the main ac voltage is coming in, the fuse and the bridge rectifier is working. There must be a reason as to why the main filter capacitor still holding the charge. By following the positive marking pin of the main filter capacitor, I traced the line circuit and saw two high ohms resistors connected in series.

These two resistors are called start up resistors. The function of the start up resistors is to reduce the dc voltage to a lower value where it can then be supplied to the oscillator circuit and switch the power fet. If either one of the start up resistor developed an open circuit, there would be no supply voltage to the oscillator circuit and the power fet would not switch. Therefore no ac voltage produced at the secondary side of the power supply.

For the above VCR, I found a start up resistor (220 kilo ohms) open circuit and causing no power symptom. Other components such as the power fet, filter capacitor and diodes found to be in good condition. For your information, if either one of the start up resistor spoilt, you have to replace both otherwise the other one would become defective after in service for sometime. Replacements of the two resistors brought the VCR back to life again.

Conclusion, whether you are repairing the JVC HR-J312EM model VCR or any kind of electronic equipment, if you came across the main filter capacitor still holding the charge even with power off, suspect a defective start up resistors. However, certain electronic equipment power supply designed, the capacitor may still hold charge even the start up resistors seems to be working. In this case you have to use other troubleshooting techniques to solve it. Please refer back to my website for more electronic troubleshooting tips.

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