PoojaMoolya: Created page with " {| border="1" |- | style="color:#000000;" | '''Time''' | style="color:#000000;" | '''Narration''' |- ||00:01 || Welcome to the spoken tutorial on '''Creating a Device Model..."

2022-09-05T07:51:00Z

Created page with " {| border="1" |- | style="color:#000000;" | '''Time''' | style="color:#000000;" | '''Narration''' |- ||00:01 || Welcome to the spoken tutorial on '''Creating a Device Model..."

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{| border="1"
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| style="color:#000000;" | '''Time'''
| style="color:#000000;" | '''Narration'''

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||00:01
|| Welcome to the spoken tutorial on '''Creating a Device Model '''in '''eSim'''.

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||00:08
||In this tutorial, using '''eSim''' we will learn -

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|| 00:12
|| To create a '''Germanium Diode''' from an existing '''Device Model''' and

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|| 00:17
|| To edit a current '''Device Model'''.

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|| 00:21
|| To record this tutorial, we will use-

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|| 00:25
|| '''Ubuntu Linux OS ''' version 16.04 and

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|| 00:30
|| '''eSim '''version 2.0

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||00:34
||To practice this tutorial, you should know to-

create a circuit schematic and simulate the netlist file in '''eSim'''.

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|| 00:43
|| If not, watch the prerequisite '''eSim''' tutorials on this website.

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||00:49
||The '''device model''' file begins with a '''dot model''' statement.

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|| 00:54
|| '''mname''' indicates the model name like '''diode model N4007, 1N4148'''.

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|| 01:04
|| '''Component type''' indicates the type of '''model''' used.

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|| 01:09
|| For example: '''D''' is used for '''Diode''', '''M''' for '''MOSFET''',and '''NPN''' or '''PNP''' for '''BJT'''.

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|| 01:19
|| '''pname''' is the '''parameter''' name and

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|| 01:22
|| '''pval''' is the '''parameter''' value.

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|| 01:26
|| The '''model''' components are already added in '''eSim'''.

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|| 01:31
|| They are referred to as '''templates'''.

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||01:34
|| The '''templates''' are in a tabular form with '''parameter''' names and values.

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||01:40
|| The '''Device Model libraries''' are used for the components present in '''eSim underscore Devices'''.

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||01:48
|| To launch '''eSim''', you need to double-click on the '''eSim''' icon on your '''Desktop'''.

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||01:54
|| I have already opened '''eSim'''.

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|| 01:57
|| Let us now create a '''Device model''' of a '''Germanium diode 1N34A'''.

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|| 02:04
|| On the '''eSim''' window, click on the '''Model Editor''' button from the left toolbar.

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|| 02:11
||The '''Model Editor''' tab opens.

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|| 02:15
||Click the '''New''' button in the '''Model Editor''' tab.

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||02:19
||A '''New Model''' pop-up window appears.

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||02:23
|| Type the '''Model Name''' as '''Germanium underscore Diode'''.

Click on the '''OK''' button.

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||02:31
||A list of '''model''' components appears on the left corner of the '''Model Editor''' tab.

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|| 02:38
|| These are the '''models''' you can choose from.

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|| 02:42
||Since we are creating a new model of a ''Diode'', click on '''Diode'''.

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|| 02:48
|| The '''diode model''' opens up in a tabular form with the '''Parameter''' name and value.

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|| 02:55
|| You can see the default values.

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||02:59
||Let us now add the '''spice parameters''' of '''Germanium diode'''.

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|| 03:05
|| The '''parameters''' of '''Germanium Diode model 1N34A''' can also be downloaded from the '''Code File''' section.

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|| 03:14
|| Download and open the file in a '''text editor'''.

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|| 03:18
|| Copy-paste the '''parameter''' values in the respective text-box in the '''Model Editor''' window.

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||03:26
||Here I am entering the values.

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||03:29
||To enter a value, click on the '''value''' field.

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||03:34
||Enter '''Rs''' as '''7'''.

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||03:36
||Enter '''Cjo''' as '''0.5 exponential minus 12'''.

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||03:42
||Enter '''N''' as '''1.3'''.

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||03:46
||Enter '''Ibv''' as '''0.018'''.

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||03:52
||Enter '''tt''' as '''144 exponential minus 9'''.

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||03:59
||Enter '''M''' as '''0.27'''.

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||04:04
||Enter '''Vj''' as '''0.1'''.

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||04:09
||Enter '''Is''' as '''2.0 exponential minus 7'''.

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||04:15
||Enter '''Bv''' as '''75'''.

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||04:19
||The sequence of '''parameters''' may vary.

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||04:23
||You can also add or delete the '''parameter'''.

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||04:28
||After the '''parameters''' are entered, click on the '''Save''' button in the '''Model editor''' tab.

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||04:35
||An information pop-up window, ''''Model saved successfully'''' is displayed.

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||04:41
||Click on the '''OK''' button.

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||04:44
||These '''libraries''' will be saved in the '''Diode''' folder of '''deviceModelLibrary''' directory.

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||04:52
||If the '''component model''' was chosen as '''BJT''', then the '''library''' would be saved in the '''Transistor''' folder.

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||05:02
||Each '''template''' chosen will be saved in their respective folders of '''deviceModelLibrary''' directory.

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||05:11
||Now let us simulate the characteristics of '''Germanium Diode'''.

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||05:16
||We will open the '''Diode characteristic''' example from the '''Examples''' folder of '''eSim'''.

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||05:24
||On the '''eSim''' window, click on the '''Open Project''' button from the top menu.

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||05:31
||Locate the directory where the '''eSim''' is installed.

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||05:36
||Double-click on the '''Examples''' folder.

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||05:40
||Scroll down and select the '''Diode underscore characteristics'''.

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||05:45
||Click on the '''Open''' button.

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||05:48
||The '''Diode characteristics''' example is added to the '''eSim''' window under '''Projects'''.

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||05:55
||To see the '''schematic''', select '''Diode characteristics'''.

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||06:00
||Click on the '''Open Schematic''' button from the left toolbar.

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||06:05
||It directs us to the ''schematic editor''.

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||06:09
||Press '''F1''' key to zoom in the '''schematic'''.

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||06:14
||Let us go back to the '''eSim''' window.

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||06:18
||Select the '''Diode underscore characteristics'''.

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||06:22
||Click on the '''Convert Kicad to Ngspice''' button from the left toolbar.

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||06:28
||Select '''DC''' in the '''Analysis''' tab.

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||06:33
||Scroll down to enter values.

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||06:37
||Enter '''Source''' as '''V1'''.

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||06:41
||Enter '''Start''' as '''0'''.

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||06:45
||Enter '''Increment''' as '''0.1'''.

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||06:50
||Enter '''Stop''' as '''2'''.

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||06:53
||In the '''Source Details''' tab, enter value as '''1'''.

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||06:59
||Skip the '''Ngspice Model''' tab.

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||07:02
||Click on the ''''Device Modeling''' tab, click on the '''ADD''' button.

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||07:08
||Double-click on the '''Diode''' folder.

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||07:11
||Select '''Germanium underscore Diode dot lib''' file.

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||07:16
||Click on the '''Open''' button.

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||07:19
||This adds the '''Germanium Diode library''' file from the '''Diode''' folder.

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||07:25
||On the '''Kicad to Ngspice''' tab, click on the '''Convert''' button.

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||07:31
||Click on the '''OK''' button in the '''Information''' dialog box.

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||07:36
||Now, let us simulate the '''Ngspice netlist'''.

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||07:41
||On the '''eSim''' window, click on the '''Simulation''' button from the left toolbar.

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||07:48
||An '''Ngspice terminal''' and '''plot''' window opens along with a '''Python plot''' window.

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||07:55
||The '''plot waveforms''' show '''DC analysis''' of the '''Germanium Diode model 1N34A'''.

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||08:04
||This '''diode''' has a '''knee voltage''' or '''turn-on voltage''' around '''0.3'''.

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||08:10
||The '''forward current''' is around '''1.7 milliampere'''.

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||08:15
||Close the '''Ngspice plot''' and '''Ngspice terminal''' windows.

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||08:20
||In the '''Python plot''' window, check the '''In''' node and '''Out''' node.

And click on the '''Plot''' button.

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||08:28
||You can see the '''forward characteristics''' of the '''Germanium diode'''.

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||08:33
||Close the '''Python plot''' window.

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||08:36
||The '''Shockley diode''' equation relates the '''diode current I''' with the '''diode voltage Vd'''.

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||08:43
||The main '''spice parameters''' that determine the '''DC analysis''' are

'''emission coefficient n''', '''saturation current Is''' and '''ohmic resistance Rs'''.

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||08:59
||For an ideal '''diode, N''' is equal to '''1'''.

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||09:03
||This factor mainly accounts for '''carrier recombination'''.

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||09:09
||Now let us learn how to edit a '''model library'''.

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||09:14
||On the ''eSim'' window, click on the ''''Model editor''' button from the left toolbar.

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||09:20
||We will edit the '''Germanium diode parameters'''.

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||09:25
||On the '''Model editor''' tab, click on the '''Edit''' button.

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||09:30
||Double-click on the '''Diode''' folder.

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||09:34
||Select '''Germanium underscore diode dot lib''' file.

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||09:39
||Click on the '''Open''' button.

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||09:42
||A tabular form of '''Germanium Diode parameters''' and its corresponding values will appear.

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||09:50
||Let us now change the value of the '''parameter N''' .

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||09:55
||Click on the '''parameter N Value field''' and enter '''4'''.

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||10:01
||Click on the '''SAVE''' button in the '''Model editor''' tab.

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||10:06
||In the '''Information''' dialog box, click on the '''OK''' button.

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||10:11
||Let us now simulate the '''characteristics'''.

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||10:15
||On the '''eSim''' window, select '''Diode underscore Characteristics'''.

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||10:21
||Click on '''Convert Kicad to Ngspice''' button from the left toolbar.

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||10:27
||Let us keep the default values for the '''Analysis''' tab and the '''Source Details''' tab.

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||10:35
||Skip the '''Ngspice Model''' tab.

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||10:39
||Click on '''Device Modeling''' tab.

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||10:42
||Click on the '''ADD''' button.

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||10:45
||Double-click on the '''Diode''' folder.

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||10:49
||Select '''Germanium underscore Diode dot lib''' file and click on the '''Open''' button.

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||10:58
||This step was done because we have edited the '''Germanium diode library''' file.

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||11:05
||On the '''Kicad to Ngspice''' tab, click on the '''Convert''' button.

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||11:11
||Click on the '''OK''' button in the '''Information''' dialog box.

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||11:16
||Let us now generate the '''plots'''.

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||11:19
||On the '''eSim''' window, click on the '''Simulation''' button from the left toolbar.

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||11:26
||The '''Ngspice terminal''' and '''plots''' opens along with the '''Python plot'''.

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||11:32
||Notice a decrease in the '''forward characteristics'''.

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||11:37
||The '''knee voltage''' is around '''0.5 volts''', which is similar to a '''Silicon diode'''.

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||11:45
||The '''forward current''' is '''1.1 milliampere'''.

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||11:50
||Close the '''Ngspice terminal''' and '''plots'''.

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||11:54
||In the '''Python plot''' window, check the '''In''' and '''Out''' nodes.

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||11:59
||Then click on the '''Plot''' button.

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||12:03
||You can see the '''input''' and '''output plot'''.

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||12:08
||Now close the '''Python plot''' window.

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||12:12
||Let us summarise.

In this tutorial, we learnt: To create a '''Germanium Diode''' from an existing '''Device Model''' and

|-
||12:22
||To edit a current '''Device Model'''.

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||12:26
||Do you have questions in this '''Spoken Tutorial'''?

|-
||12:30
||Choose the minute and second where you have the question.

|-
||12:35
||Explain your question briefly.

|-
||12:38
||Someone from the '''FOSSEE''' team will answer them.

Please visit this site.

|-
||12:45
||For any general or technical questions on '''eSim''', visit the '''FOSSEE''' forum and post your question.

|-
||12:54
||The '''FOSSEE''' team coordinates the '''Circuit Simulation''' project.

|-
||13:00
||We give '''Certificates''' and '''Honorarium''' to the contributors.

For more details, please visit this site.

|-
||13:09
||The '''FOSSEE''' team coordinates the '''Lab Migration''' project.

For more details, please visit this site.

|-
||13:18
||'''Spoken Tutorial''' Project is funded by '''NMEICT, MHRD, Govt. of India'''.

For more details, visit this site.

|-
||13:30
||This is Gloria N from IIT Bombay signing off.

Thank you

ESim/C2/Creating-a-Device-Model/English-timed - Revision history

PoojaMoolya: Created page with " {| border="1" |- | style="color:#000000;" | '''Time''' | style="color:#000000;" | '''Narration''' |- ||00:01 || Welcome to the spoken tutorial on '''Creating a Device Model..."