Microelectronics Circuit Design and Analysis FREE Download

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David Pozar Microwave Engineering Solution Manual

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Practical Matlab Application for Engineers- Free ebook

This free matlab tutorial ebook "Pratical Matlab Application for Engineers" contains time domain and frequency domain matlab tutorials, AC and DC signal examples, Fourier and Laplace tutorial, DTFT,DFT, ZT and FFT matlab programming examples and also analog filter and digital filter examples in matlab software. If you don't have matlab software then you can download matlab software here in this blog.

Download Link:

http://www.filefactory.com/file/n977r1rfve5/n/Kalechman_M._Practical_Matlab_Applications_for_Engineers_CRC_Press_2008_en_708s_.pdf

Abaqus v6.10 Software Free Download

Abaqus v 6.10.1 ISO-TBE can be download here for free, the link is provided below. Stimulia Abaqus software supports multiphysics simulation helpful for mechanical, electrical, thermal, moisture simulation  and perform, analyze different materials like metal, plastic, rubber and others required for modelling and prototyping electronics consumer products. FEA Abaqus is based on finite element analysis modelling (fea modelling)which is very helpful in todays rapidly growing electronics industry for faster productivity and manufacture-ability of electronics system design end products while lowering the cost and design cycle.

Fig: Abaqus v6.10 Software Free Download

Download links:

Simulia.Abaqus.v6.10.1.ISO-TBE.part1.rar [1.91 GB]
http://d01.megashares.com/?d01=4OTs5JD

Simulia.Abaqus.v6.10.1.ISO-TBE.part2.rar [1.04 GB]
http://d01.megashares.com/?d01=jtP4TvB


Other popular Free Electronics design software:

Xilinx ISE Design Suite 14.3 Free Download
Portable Matlab R2012 Free Download
Mentor Graphics Expedition Enterprise Free Download
Cadsoft Eagle Professional Free Download 
 

Free Download MPLAB IDE v8.10

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Download Atmel Studio 6 for Free

Download Atmel Studio 6 for Free

Download Atmel Studio 6 for free here. Atmel Studio is useful for avr programmer for development and debugging of Atmel ARM Cortex-M and Atmel AVR microcontroller. With this microprocessor based application you can learn and build, write machine code in C++, assembly language and for development of firmware.

Atmel Studio is useful for microcontroller and microprocessor designers. It is similar to Mplab IDE software from microchip. See download Mplab IDE for more information.

Download link for Atmel Studio 6 for free:

http://rapidgator.net/file/a932addebac9cfcc31072cabff614b0b/AtmelGallery.part1.rar.html
http://rapidgator.net/file/ce3cd5e3cb3601995447a80f2b8a4be1/AtmelGallery.part2.rar.html
http://rapidgator.net/file/c1c0401d64e3bde10f67415cb175524c/AtmelGallery.part3.rar.html

Dowload ipad excel spreadsheet apps for free

Fig: Ipad excel spreadsheet apps for free

Download Apple's ipad number v1.4 application for free from the link provided below. ipad (or iphone) number application is a spreadsheet application which can also be downloaded from apple from the app store. Here you can download for free. This ipad application is a spreadsheet application for apple's ipad,iPhone,ipod touch which can be used to create tables, charts, photos etc with just touch of finger. It can also be used for iphone spreadsheet or ipod touch excel spreadsheet application.

Download Link for IPAD EXCEL SPREADSHEET:

http://d01.megashares.com/dl/FK9QMA6/Apple.Numbers.v1.4.iPad.iPhone.iPod.Touch.NON.STOLEN-Lz0PDA.rar

Download Comsol Multiphysics Simulation Software Free

Fig: Comsol Multiphysics for thermal analysis of IC on PCB

Comsol Multiphysics 4.3 is a simulation software based on electromagnetic simulation used for scientific research by engineers, scientist for electronic packaging design prototyping and viewing the designed product before manufacturing. The multiphysics environment allows product designers, engineers and researchers to create 3D model, design board, pcb prototype and view the electronics/ electrical parts, mechanical parts, chemical and fluids and it also provides interfacing and import/ export to other CAD and EDA software. Comsol simulation software is an EDA based on finite element method. Free download Comsol multiphysics links are given below

In particular the RF cosmol simulation software is useful to electronics designers to create 3D electronics components and evaluate performance and visualize the effect of RF heating, stress and elastic deformations.


Download links:

http://rapidgator.net/file/01d3f6cc50cbbde80c313933a92b3e25/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part1.rar.html
http://rapidgator.net/file/6858ad59e71f03f943dc389dd8dae747/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part2.rar.html
http://rapidgator.net/file/367a7f1a8a1f3d14777e6b0d05e11f2c/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part3.rar.html
http://rapidgator.net/file/e66d816b186ae1a3a769355ca4bfc99f/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part4.rar.html
http://rapidgator.net/file/030061a564264a9ebfcb64ed1d79f8fb/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part5.rar.html
http://rapidgator.net/file/5af27abb7a0b46363b4f5c1a95036c79/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part6.rar.html

or

http://extabit.com/file/29g2wym0iuxkk/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part1.rar
http://extabit.com/file/29g2wym0iuxhg/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part2.rar
http://extabit.com/file/29g2wym0iuxl0/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part3.rar
http://extabit.com/file/29g2wym0iuo1w/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part4.rar
http://extabit.com/file/29g2wym0iuo3o/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part5.rar
http://extabit.com/file/29g2wym0iur84/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part6.rar

or,

http://lumfile.com/itm5j4y9n3u0/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part1.rar.html
http://lumfile.com/ie5jtld1ehi6/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part2.rar.html
http://lumfile.com/5h8f8k6b1sb9/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part3.rar.html
http://lumfile.com/0564q6s5oxhv/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part4.rar.html
http://lumfile.com/gqlfh2ceuiln/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part5.rar.html
http://lumfile.com/fd6uticpmbf1/COMSOL.Multiphysics.v4.3a.Multiplatform.ISO-TBE.part6.rar.html

download Microsoft Visio 2013 for free

Download ms visio 2013 free

Download the latest version of microsoft visio 2013 for free. Microsoft Visio 2013 is a project management software is useful for project management works and used by project managers, ceo, engineers and the like.

Microsoft Visio 2013 lets you create diagram of complex project, schedule task, assign resources to task, write work description etc. Electronic engineer can use this software to plans for design projects, from starting electronics circuit design, electronics circuit simulation, pcb design, electronic packaging design and pcb manufacturing. This Microsoft Visio 2013 download free is also useful for anybody in their project and to student for academic work.
 
Activate Method (Phone Method is the best)(Update April 13, 2013):

http://pastebin.com/vEn1abuC
VL Version must use KMS Tool to activate. This key only for Retail version

USE Advance Token Manager to BACK UP Your LICENSE 
 http://disk.karelia.pro/fast/f7v2LmF/

Download Links for:
Microsoft Visio/Project Professional 2013 Retail + VL (x86/x64)
Incl. Keys/KMS Tools

For Visio Professional 2013 VL (x86) - (English) 
  
https://safelinking.net/p/6578e78463
or,
https://safelinking.net/p/1c5c9d46dd
or,
https://safelinking.net/p/90817b2708
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or,
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For Visio Professional 2013 VL (x64) - (English)

 https://safelinking.net/p/b8c1867b9b
or,
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or,
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or,
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For Project Professional 2013 VL (x86) - (English)

https://safelinking.net/p/e4c8a015f0
or,
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 or,
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or,
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For Project Professional 2013 VL (x64) - (English)
  
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or
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or,
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or,
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Also,

Visio Professional 2013 (x86) – (English)
File Name: en_visio_professional_2013_x86_1123796.exe
Languages: English
SHA1: cc91588734c11afa15703e29169919fd476e4e60

https://safelinking.net/p/6cce505b22


or,

https://safelinking.net/p/7829895b70

And,

Visio Professional 2013 (x64) – (English)
File Name: en_visio_professional_2013_x64_1123802.exe
Languages: English
SHA1: 6812cb3a4967824fefe29e302968f13b98fa85c6 

https://safelinking.net/p/be673359cb

or,

https://safelinking.net/p/78648a9f01

Similarly,

Project Professional 2013 (x64) – (English)
File Name: en_project_professional_2013_x64_1123813.exe
Languages: English
SHA1: ed737bd07ec815d898f5a72b773f529a8d3aafdc 

https://safelinking.net/p/4d182a4aa9

or,

https://safelinking.net/p/a6b383ae27

And,

Project Professional 2013 (x86) - (English)
File Name: en_project_professional_2013_x86_1123807.exe
Languages: English
SHA1: 3a44d77f437fac9f59a9afe5d1915a81106b0fa4 

https://safelinking.net/p/8a59ac9c41

or,

https://safelinking.net/p/0258734c8c

Free Download Autodesk for Electronics Product Development

Download AUTODESK SIMULATION DFM V2014 WIN64-ISO for free. Autodesk is a 3D product design software that can be used to prototype electronics product. After having designed the electronics circuit, pcb board for manufacturing, the pcb board can be further imported in the autodesk software to design the 3D housing and get a visualization of the final product before it is sent to the product development firm. Autodesk simulation software for electronics is useful for those who provides or is interested in providing 3D electronics product development services or consumer electronics product development. The free download Autodesk 3D product design software is 1.05GB in size.

 Download Link:

http://uploaded.net/file/1qtf1k99/AUTODESK.SIMULATION.DFM.V2014.WIN64-ISO.rar

Download NI Multisim Ultiboard PowerPro 12.0.1 Free

Download Multisim & Ultiboard (Circuit Design Suite) PowerPro 12.0.1 for free. Multisim is used to create schematics of circuit board and Ultiboard is used to design and prototype printed circuit board. This PCB manufacturing software is developed by Analog Devices National Instrument Corporation.

Analog Devices Multisim allows electronics engineers to create and enter schematics of electronics product, perform simulation, evaluate performance. During the design of circuit board schematics electronics components have to be added which can be easily done from the database. If there is no parts available then new part can be created. The parts footprints search can also be performed and associated with the part. In Multisim the different color of the components in the schematics shows which component has available simulation model and footprint and which components has only simulation property. Once the ERC checks, simulation analysis is performed the schematics to pcb layout transfer can be done.

Analog Devices Ultiboard is a EDA tool to prototype PCB board. The circuit board schematics from the Multiboard is transferred to Ultiboard to prototype printed circuit board. The transfer of schematics from Multiboard to Ultiboard is easy with simple few step clicks. Once the transfer is complete the Ultiboard software is used for pcb production process that involves creating board outline, the mechanical holes, annotation, manual and auto-routing, layer assignment, power and ground plane assignment etc. Once the PCB board design is completed the Gerber PCB file, DFX files for pcb production can be generated and sent to the pcb manufacturer.

Multisim 12 full version free download links:

http://rapidgator.net/file/44132626/Multisim_12.0.1.rar.html
or,
http://lumfile.com/6753s471mhbb
or,
http://extabit.com/file/279fqtda2o0je

Free Download Labview 2012

Fig: NI Labview

Download Labview 2012 for free. Labview is a EDA tool to solve engineering problems using automatic data collection and testing. This software can be used with Multisim Ultiboard software for solving electronics design problems.

Labview 2012 from National instrument is a graphical programming tool used by researchers, scientists and engineers around the globe. It is a graphical system design tool that can be used for example to design pulse code modulation system, digital modulation, encoders decoders, multiplexers with the use of VI modules. There are library of VI modules for example for flip flops, multiplexers, registers, FPGA devices, micro-controllers. It can also be used for programming embedded system and FPGA then the designed system can be implemented in Xilinx ISE design suite. The designed system can be converted into program and exported to other EDA. It ease the presentation and processing of data.

Labview download student can be to generate and save realistic waveform data obtained from simulating the circuit schematics created from Multisim. Once the output data is collected the circuit schematics to PCB layout is performed, that is the schematics from the Multisim is transferred to Ultiboard PCB prototyping software. After the PCB is produced from the Gerber PCB file the physical PCB board with components on them can be again tested with the Labview to compare the results.

Free Download Link for Labview 2012 :

http://uploaded.net/file/7kwwdyee/Labvi1ps.part01.rar
http://uploaded.net/file/l44p8g7p/Labvi1ps.part02.rar
http://uploaded.net/file/qtdn9qnq/Labvi1ps.part03.rar
http://uploaded.net/file/7bolsjrt/Labvi1ps.part04.rar
http://uploaded.net/file/hdzzwuzz/Labvi1ps.part05.rar
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http://uploaded.net/file/mrt34nlr/Labvi1ps.part08.rar
http://uploaded.net/file/tnj5515s/Labvi1ps.part09.rar
http://uploaded.net/file/uotq63vn/Labvi1ps.part10.rar
http://uploaded.net/file/1cxnp8zm/Labvi1ps.part11.rar



How to design pcb in orcad?

Orcad cadence is a popular pcb design software used by professional engineers around the globe. Here how one can learn to design pcb using orcad pcb software quickly is described. First of all you have to download cadence orcad pcb software.

The major general steps to designing a pcb with orcad are:

1. Start orcad capture and draw the schematics
2. Perform Simulation and verify result and replace/add components according to your result requirements
3. Find and assign the footprints(names) for all the schematics symbols
4. Perform annotation
5. Perform DRC
6. Create Netlist
7. Open orcad PCB Editor
8.  Define board outline
9. Place the mechanical components
10. Place the electrical components
11. Create layers if multiple layers are required
12. Place copper pours(multiple layers)
13. Check electrical rules, physical rules and spacing rules in the constraint manager
14. Perform manual and automatic routing
15. Generate Artwork for manufacturing

Once you have downloaded the orcad software, you have to start the orcad schematic capture which is a tool where you can enter the schematics or circuit diagram of the electronics system which you want to design. This requires you to place parts from libraries. There are two kinds of libraries, one that has footprints, part symbol with simulation information and those with only part symbol but without simulation information and/or footprints. Any part used in electronic system design prototyping need its schematic symbol for identification, simulation profile(how it works) and footprints(for pcb generation). If there is no part symbol(and/or simulation profile) then you have to create a new one which you can do so either from orcad capture window or from the model editor application.

Once the schematics of the electronic system to be designed is complete. The next step is to perform simulation. Once the simulation is verified the schematics parts are assigned their footprints. If there is no footprint available then you have to either search for footprint or create a new one using pad designer or using the new part option in the orcad PCB designer.Then the next step is annotation(giving unique identification names to parts) and perfrom DRC(Design Rule Check) to check any error. If there is no DRC then you can create a netlist of your circuit.

This netlist is required by the PCB designing software. During the netlist creation you have the option to automatically open the Orcad PCB editor(or you can independently open the PCB editor and go to open menu to open the netlist file). Once the PCB editor is open you have to create a board outline and start placing components both mechanical components that will hold the pcb board and the electrical components(capacitor, resistors, amplifiers etc).

If it is required to have more than two layers then multiple layers has to defined next. After this pouring of copper planes and construction of vias and the fanout has be carried out. Then the spacing between the copper traces, length width of the copper traces and other electrical and non electrical constraints have to be defined prior to routing the traces using the constraint manager. Once the constraints are defined the next step is to perform routing. The routing can be performed manually for critical nets(for eg power and ground nets) and fixing such nets and then the auto-routing to non-critical nets can be applied for speed-up. The last step is to generate artwork which contains all the information of the pcb to be manufactured, this file(extension usually gerber) is sent to the pcb board manufacturer.

To learn to design pcb in orcad, we recommend you to Download Kraig Mitzner Complete PCB Design Using OrCad Capture and Layout 2007, which you can do so for free

Download Fundamental of Microelectronics Behzad Razavi

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Agilent Genesys 2012 Free Download

Fig: Agilent Genesys 2012 Free Download

Download Agilent Genesys - an RF and Microwave electronics board design software that is used widely by RF circuit board design engineers and PCB Board Designers.

As an overview example on application of this electronics board design software - it can be used for drawing schematics diagram of an electronics circuit. Then the designed electronics circuit can be analyzed such as performing S11 and S21 S-parameter analysis, smith chart analysis. Another great feature of this pcb board design software is that the values of the circuit components can be varied easily and simultaneously check the output graph to optimize the electronic component value for desired output. This work is much easier to do in agilent genesys than for example in cadence orcad software. Also in agilent genesys electronics board design software circuit schematics of any transmitter or receiver can be designed easily and then the spectrum of signal at any node in the designed circuit can be viewed by simply clicking on the desired node and clicking on the spectrum option that pops out. The best part of genesys is that the once the transmitter or receiver is designed the power level link budget can be viewed on a graph. This means that the gain and attenuation power level in dB at input and output of each components such as mixer, amplifiers, filters can be viewed. This gives many information of the system performance. For example it can be used to see which component is causing unexpected power loss and which component can be modified to obtain desired better output power level. Moreover, the input power in dB can be varied with easy scroll part and the power link budget in the circuit will be changed automatically.

Other advantages of using this electronics board design software is the automatic optimization of components values, automatic generation of strip lines and pcb layout. Then using this pcb board design software the pcb layout can then be optimized further with agilent momentum electromagnetic tool at desired frequencies. The optimized circuit can then be transferred to the PCB layout tool to generate the Geber PCB files for manufacturing. Agilent Genesys pcb board design software also supports 3D view of the designed pcb board with the components on it so that engineers can visualize the final design.

Agilent Genesys 2012 electronics board design software free download links

http://rapidgator.net/file/24378299/AgilentGenesys.2012.01.part1.rar.html
http://rapidgator.net/file/24378297/AgilentGenesys.2012.01.part2.rar.html
http://rapidgator.net/file/24378301/AgilentGenesys.2012.01.part3.rar.html

Or,

 http://letitbit.net/download/71966.7173c716688574d4db907d4f16f0/AgilentGenesys.2012.01.part1.rar.html
http://letitbit.net/download/95061.9c00043acb7f1ff8f799c87eb90e/AgilentGenesys.2012.01.part2.rar.html
http://letitbit.net/download/62216.6b8944657124aee454ddc3ec1f2c/AgilentGenesys.2012.01.part3.rar.html


Other Similar EDA software for downloads:

1. CST Studio Suite 2013
2. Altium Designer v 10
3. Proteus Professional 8
4. Xilinx ISE Design Suite v14

Download Cadence Orcad 16.5 PCB Design Software

Fig: Cadence Orcad 16.5 Free Download

Cadence Orcad 16.5 is an integrated tool for schematic design entry, circuit board design, simulation and pcb layout board design software for designing electronics products. It is used by professional engineers and circuit board designer around the world for schematics drawing of electronics circuit board and for PCB board Prototyping.

The design step to design PCB board is to enter the electronics schematics, then to perform simulation and other analysis. If the simulation result are correct then footprint are added for PCB board design. Then the next step is to transfer the designed Orcad schematics to PCB layout tool called allegro PCB. The nice feature of this PCB board design software is that there are lots of automation during the transfer process of orcad schematic to PCB board design making it easy for designers to quickly develop PCB for manufacturing. During the PCB design, it provides very useful features such as components placing, auto routing and design of multiple layer pcb and others. After the PCB board design is completed, it generates Geber PCB file required by the PCB manufacturers. Gerber PCB is the final file required which in case of orcad is generated by the artwork tool. See the orcad capture video tutorials.

Download cadence orcad 16.5 along with hotfixes from the link provided below.

 Download Links:

Cadence SPB/OrCAD v16.5 - [2.15 GB]:

• https://safelinking.net/p/d08a268f8d

Cadence SPB/OrCAD v16.5 Latest Hotfix - v16.5-S033 (2012-10-31) - [632 MB]:

• https://safelinking.net/p/5bebcab126

Cadence SPB/OrCAD v16.5 Installation Instructions - [2.11 kB]:

• https://safelinking.net/p/d0f8fb8058
  

Other PCB Design Software Download Links:

1. CST Studio Suite 2013
2. Altium Designer v 10
3. Proteus Professional 8
4. Xilinx ISE Design Suite v14 

Cadence capture Schematic and Orcad PCB editor tutorial ebook in pdf format:

1. Schematic Capture with Cadence Pspice by Marc E. Herniter
2. Complete PCB Design using Orcad Capture and layout 2007 by Kraig Mitzner

Thomas H Lee - The Design of CMOS RF IC

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Diptrace Download for Free

Download Diptrace for free. Diptrace is a PCB circuit board prototyping software used for producing electronics products. It is a widely accepted PCB Manufacturing Software used by electronics students, engineers, researchers and Electronics Design Companies.

Diptrace PCB circuit board prototyping tool has schematic editors, pcb layout editors, simulation and analysis tools, error checking capabilities like ERC, DRC, manual and auto routing capabilities, generates bill of materials(BoM) reports, Gerber PCB files, NC drill files, DFX files and others.

It has also easy to use interface, with library of components of different electronics manufacturers such as National Semicoductor, Analog Device, Philips etc. The part search is very easy to use and is at the top horizontal bar with names of the manufacturing companies. If there is no part available then the part can be created and imported into the Diptrace software. 

Some of the difference between the Orcad capture PCB circuit board prototyping software and Diptrace are like the zoom in and out capability which is found in Diptrace but not in Orcad capture. Another difference is that when any wire is hovered with the mouse the wire becomes highlighted showing the wire connection to different part in the design. This is useful in a large project circuit board.Diptrace PCB manufacturing software is easy to start and learn. The Diptrace website has a excellent video tutorial to learn schematics, designing layout, auto routing and generating gerber pcb for PCB manufacturing. 

Download link for DipTrace v2.0.07:

Full Download: http://depositfiles.com/files/ayzuqc8ul

Application Only: http://diptrace.com/downloads/dipfree_en.exe

Crack Only: http://thehiveteam.iamspace.com/upload/cracks/Hive_DipTrace_v2.0.07_Loader.zip

Educational Game

Educational Game

This educational game project can be used in a quiz competition to see which of the participants press the button first to answer questions posed by the quiz master. This constructional project is based on a latch CD74HC75 IC and a 4 input CD74AC20 NAND IC. The first person to press the switch will light up the LED designated for the person. The rest of the LEDs will not be able to be activated until the RESET button is pressed.

The truth table of the Latch IC and the NAND IC is as shown in the figures below.

Schematic Diagram

Initially when RESET button is pressed, the output of NAND gate from U2A will be logic "0" as all the inputs are at logic "1"state. As shown in the truth table for NAND gate, when all the inputs are "1", its output will be "0". Hence the output of NAND gate from U2B will be logic "1" since an input of "0" will cause it to go to logic "1". The logic "1" to the latch indicates that it is ready to output any data once any of the button is pushed.
If the first button pushed is S1, the logic at its output 1Q will be logic "0" and caused LED1 to light up. At the same time,it caused the output of U2A to go into logic "1". Hence the output of U2B will be logic "0" causing the latch to be disable which means that the outputs of all the latches will be at their previous state. As a result, the player who pressed button S1 will be shown as the one who is first to press the button and so qualify to answer the question.
The RESET button will be pressed by the quiz master to prepare the circuit for the next game.

Parts List

Time Delay Circuit

Looking for a simple time delay circuit? In the design of analog circuits, there are times when you would need to delay a pulse that came into a circuit before being used for the next process. This circuit uses a 555 timer to delay a pulse that comes in to a maximum time of 75 seconds. The timing of the delay can also be changed by changing the resistor value of VR1 and the capacitor value of E based on the time delay formula of t=0.69RC.

In order for the output to go high, the reset pin of 555 timer (pin 4) must be high and the TRIGGER pin (pin 2) voltage level must be below a third of the level of the power supply to the IC. When there is no pulse being applied to the input, transistor Q1 will turn ON and capacitor E is charged.

Once a pulse is applied to the input, transistor Q1 will turn OFF and pin 4 reset pin is held to high. This caused the capacitor E1 to be discharged through VR1 resistor. The time delay will depend on the discharged of capacitor E to a third of the supply before the output of 555 goes high. Experiment with different values of VR1 and E to get different time delay.
If the maximum value of potentiometer is set to 5M ohm, the time delay of the pulse will be 75 seconds.

Parts List

 

This is a good project to embark on if you are a beginners to electronic design. There are only 5 components needed to construct this circuit. It will provide you a good hands-on experience of using the 555 integrated circuit, one of the most commonly available IC widely in use for the past decades.