Wires 6. LIGHT EMITTING DIODE CHARACTERISTICS (SAMPLE LAB WRITEUP) John A. McNeill ECE Box 000 March 17, 2004 ABSTRACT This lab investigates the V-I characteristic of a light-emitting diode (LED). Light Emitting Diode (LED) Schematic symbol and I-V Characteristics Curves showing the different colours available. Fig. Part 3: Identify the Controls and Variables ... characteristics, behaviors, and habitats of the creatures can be used in … 331 0 obj <>/Filter/FlateDecode/ID[<951FF674811BFA43920D0E7D1B4A0DC5>]/Index[313 34]/Info 312 0 R/Length 91/Prev 169991/Root 314 0 R/Size 347/Type/XRef/W[1 2 1]>>stream �_~,����֦��/�:�dQ���&+�����iN��P��i�+�8�7��� ��Rc���hG�smxM?p�_��S�u;8� endstream endobj startxref 2 ... is a list, by letter symbol, of the major electrical characteristics for the rectifier and signal diodes. !M�HJ�j�J�� ���?��/�.�� Connecting electrodes are following: positive p-side is anode, and negative n-side is cathode. This threshold voltage concept comes from the fact that a diode is just a pn junction. EXPERIMENT 7:Observation of characteristics of a Zener diode Debangshu Mukherjee BS.c Physics,1st Year Chennai Mathematical Institute 7.11.2008 1 Aim of experiment In this experiment, we try to observe the relation between the voltage and corressponding current generated. Physics Page 3 of 8 S . Electronic Measurement & Instrumentation (EE-323-F) LAB MANUAL(V SEM ECE) Page 4 VERTICAL AMPLIFIER:-This is a wide band amplifier used to amplify signal in the vertical section of the signal. ��X@8�"�'�H6��.%J�x`�`8+*��}������ViX_����^!iO���GqՉ���#�W/�5�/��!l%]�"y��s$�G^���E���^��T>���2?��ńy��â���A�x���*LK0S�"�-��4�����J݇� 3. DELAY LINE: – It is used to delay signal for sometime in the vertical section. of ECE CREC 9 2. The LED specification for light intensity is important. stream h�b```��,��@����(��!E��#~���d�n\g㌖z��������Hq�Հ�2�Hi0>3�3� ;H�P�૰ر�i�W���00��pV���*��T���h�f`�d��� /Length 302 this lab manual a method based on the shift of the peak emission wavelength with the temperature and a method based on the shift of the diode forward voltage with temperature are discussed. In 1962, Nick Holonyak has come up with an idea of light emitting diode, and he was working for the general electric company. ZENER DIODE CHARACTERISTICS AIM: 1. Basic Electronics Lab Manual School of Physical Sciences National Institute of Science Education and Research Bhubaneswar . @U`k��8 endstream endobj 317 0 obj <>stream 70 0 obj << /Length 538 For example, in the TTL logic family, there are several logic series: the 74 standard, 74L low-power, 74H high-speed, 74S standard Schottky, 74LS low-power Schottky series, and 74ALS advanced low-power Schottky series. :Q�CY��}�@����w��3���!.48vA�RM�>?��$b}���W���}���B�dӴ��@�F{�����e!�1=�f��MMK���t�:#?f ���>�������ҏ��˼�� �"-� >> x��UMs�0��W�(�j�e�X e����V8�XIL;c9m���V��GI�N���}zo���Eg����fW7�!H)P�D@�Z���Q��;��*[6.��ݞ�C&�TJ�fR3E��!�8� The LED is a special type of diode and they have similar electrical characteristics of a PN junction diode. �H�4=�EaD�O�\����dLD�W��x������~d�n�h�Ɩ�f=!O�xC��Z/N��b������Z�_=fɔ���jℤsB�3h�9s�C r� H��V�n�8}�W�V4o"E�(����Y���I\Y�����-#��w��dG���0D�䜹�r��jq�5�ݻɇ��)�����%��Ϥ��ʒk�6��ɵvܐ]��K6�e��gA�,,�] ��.��0P���,4Q��0-@��lr�d��>eW@���&{Sdg���$��ɾ�d���X�g�5��,I��aT�rP��"gI��n���S�Q�r�5%�0E��}���Jk�@��g���? Zener diode is used for voltage regulation purpose. Therefore, over �H��QPQL[�(�����.��N��m���0���{h��l���0t*l���;���C6���?����.���fU.������u��t}�x6��f��f���OZW���s�}|i~�5eSe���[?��NO��v^� �0ٴ|��Z<>5���X�]'2����|��ڲ�uݜ��_�N�v������n�jˮ����zU�����rQat������z�py��gͦj�Oq�������yvє��|R?.+�g��Z�ʸ4�2q,��Y<7�M�[X��֯7��=�c=_?,������E�}��l��S��G���3�)��#������ �sg�Kс��i{g�c�� ���!S��?>��QX�;� �y��%��IoY�c�Π��9�B@�Y_ƺ�)]��b� The effect is a form of electroluminescence where incoherent and narrow-spectrum light is emitted from the p … p�I �� U� ` �T"D , the current level, encapsulation and other factors. common emitter configuration is the same as the I-V characteristic of a diode. Light emitting diode (LED) symbol. The experiments in this lab manual are designed for low voltage which minimizes the electrical shock hazard, but it only takes several milliamperes of current to cause a harmful electrical shock. To observe and draw the V-I characteristics and Regulation characteristics of a Zener diode. 2 shows, voltage control of LEDs might be possible. �/�Z��Eֶ���L�CZ:A���B��I{r��)24L�t�{��& ��Zʄ}~T�˔dݜ�>�����7����M�����0y�;Hޣ��e誼�'"���e��27%'����[T�"ċ�c��dq�������&�� ��@�b�x���S .�'C�*�O�u���E.�;�\\�'.�;čH�!n� .��\�Ii�Wi�.��"G44\h|�RK>�����o��G��c*>��y;f���6�-ջ��[�#o�M�}��}�;�,�%���}�vQ�}Qu?��k�i!QƆ�kLe^��E%�T"RJ��y��x��y�u�;2�|�ۈM�Q��q\��E������ �]Nu�!�KG��LJ�Hm�h�7�����oO�RǾ!��N����y�}Y�[*�{�f:�[��ކ��JmZ��t^�J���� U2ʁH�6�b�T;�b!�}*�f�X�:�_��P�P����}ƨ��m[8BUU�ۣ�ȯ-E� �nr�xCΊ�R �1X|ӪV�;�Vp�S����%}D�_D�I�j�:�z�"��MJ8$uR�8�$T�X��G*稪�kK��C���? /Filter /FlateDecode 0 12 Characteristics of BJT in Common Emitter Configuration 26 ... and procedures in the Lab Manual before starting the experiments. TIME BASE: – It is used to generate sawtooth voltage which it is applied to A light emitting diode (LED) is known to be one of the best optoelectronic devices out of the lot. 313 0 obj <> endobj Don™t feel bad if you haven™t studied pn junctions before; it is not required for this lab. In the first part of lab, there are tasks where we have to practically understand the characteristics of semiconductor diode. %%EOF endstream Consequently, the I B and V BE relationship in the . Around 1900 Planck developed the concept of energy quantization to explain the spectral distribution of xڅ��N1E�|��M����D@B �f������H�{�)�!Qyl�̽sG�7&��D�s^瓋[���k&�J����,_�y�6u�7SN�eOu8T� �q�������ƎW�"�ڀ7f��倆�i�lönF*����4�')GwU,�}��6:+ߋX�mCӆ���#��@�c�������@2��T@������d-���]�U��"[/G�tNr"Pi.-xɫ�C�,H�)��T�p�F���X�MX����. With each of these devices, the current increased as the light increased The photodiode was measured by using the base and collector leads of the phototransistor The phototransistor measurements were made between the emitter and collector Semiconductor diode Objectives This laboratory work consists of two parts. •If, we just reverse the diode to measure the I-V characteristics, the sudden change might destroy the diode. It will then increase Introduction: The Zener diode is designed to operate in reverse breakdown region. The light intensity is governed by a variety of factors including the LED chip itself (including the design, individual wafer, the materials, etc.) However, a slight increase in the temperature results in a shift in the curve characteristic to the left as can be seen in Fig. The LED occupies the s… 3.2 Junction temperature and LED emission The emission intensity of LEDs … •Current must not pass through it for a very long time. LAB MANUAL EC6712- OPTICAL AND MICROWAVE LABORATORY . >> %PDF-1.5 %���� This was conducted as an introductory to Electronics laboratory and in line with some topics in lecture classes. 3. LAB MANUAL 2009 Author: Todd Kaiser Montana State University Solar Cell LAB MANUAL July 2009 This manual was designed for use with the Montana Microfabrication Facility at Montana State University. INTRODUCTION Max Planck (1858-1947) was an early pioneer in the field of quantum physics. •The diode should not be short-circuited. 10. endobj Light Emitting Diode (LED) A Light Emitting Diode (LED) is a semiconductor diode that emits light when an electric current is applied in forward direction of the device as in simple LED circuit. Our High-Power LEDs for Microscopy, Collimated LEDs, Multi-Channel LED Sources, and Illumination Kits are all designed for microscopy applications. the phototransistor characteristics. LAB MANUAL ELECTRONIC DEVICES & CIRCUITS LAB Dept. ANNA UNIVERSITY: CHENNAI SYLLABUS R - 2013 L T P C 0 0 3 2 LIST OF EXPERIMENTS ... DC Characteristics of LED 2 Mode Characteristics of Fibers 3 Measurement of Connector And Bending Losses 4.a) Setting Up … Below are several general safety rules for all digital experiments and activities in the laboratory. This experiment led to the development of what major medical advancement…? CIRCUITS LABORATORY EXPERIMENT 6 TRANSISTOR CHARACTERISTICS 6.1 ABSTRACT In this experiment, the output I-V characteristic curves, the small-signal low frequency equivalent circuit parameters, and the switching times are determined for one of the commonly used transistors: a bipolar junction transistor. The Light emitting diode is a two-lead semiconductor light source. NAME OF LABORATORY: Engg. THE CURRENT-VOLTAGE CHARACTERISTICS OF AN LED AND A MEASUREMENT OF PLANCK’S CONSTANT Physics 258/259 I. We will then plot it to get the depen-dence. Optical Fiber Communication Experiment Kit 2. Figure 1. AVO meter 5. 2 Preface This laboratory book in Electronics I has been revised in order to be up to date with curriculum changes, laboratory equipment upgrading, and the latest circuit simulation software. The device is capable of emitting a fairly narrow bandwidth of visible or invisible light when its internal diode junction attains a forward electric current or voltage. 346 0 obj <>stream LABORATORY MANUAL DEPARTMENT OF ELECTRICAL & COMPUTER ENGINEERING Revised Summer 2018. characteristics are obtained between the input current I B and input voltage V BE at constant output voltage V CE. b�tL��&:���c+�e�A5U�%�,��Ƙ\���#�� ���qhv�X֨"�ڰ��@��֫�F�;j�z��>6�S��[�J �h�Jq8��K��"��%���a���&=G�пՓ�:�#���L�. 49 0 obj << The symbol of LED is similar to the normal p-n junction diode except that it contains arrows pointing away from the diode indicating that light is being emitted by the diode. The visible lights that an LED emits are usually orange, red, yellow, or green. 3: Forward I–V characteristics of the 340 nm LED measured at 5-300 K [2] As Fig. That will allow a flow of huge current which might destroy the diode. 2. gk���P-���l��Aat3�u0� �h- 4�ݻW@P�?AT��I�r>*�5�}M��R�(A�P���K��ݗ���JF�pc�;[�f_�1O&Q,)�?��q�k:��p'�L�� �"v[8�&�Г��7��;5��ecF���2����L� �E�B˪~4u6զ1��7D Table 1. However LED luminaires with very bright light points, which can be perceived indi-vidually, are crucial. Diode, power Supply, dc milliammeter and dc voltmeter Here is a semiconductor light source and their units characteristics. Might BE possible: Engg procedures in the Forward direction and blocks the current the. Planck ( 1858-1947 ) was an early pioneer in the vertical section: positive p-side is anode, a. 6. characteristics are obtained between the input current I B and input V... 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