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Posts posted by slackjack

  1. You could use the LM741 operational amplifier to demonstate some simple function of math such as addition, integration and differentiation.

    The simplest one to design is probably the summing amplifier. Set all resistors equal and the output is the negative sum of the all inputs. To get rid of the negative sign use another LM741 as an invertor with a gain of 1.

    Summing op amp configuration

    Inverting op amp
    To achieve a gain of 1, set Rin = Rf.

    The output is taken from the inverting op amp. This is actually how they used to do addition and in different configurations; calculus functions. Using volatge to represent numbers.

    Hey you said simple  ;D

    Alittle more challenging one (using the same LM741) is to design a "force calculator" - the force required to accelerate or decelerate an object. The LM741 must be configured as a differentiator.

  2. Thanks for the input guys.

    Ante, I'm now interested in Hall-effect (or similar) sensors. Do you by any chance havethis in your collection?

    So Hall effect sensors work by detecting the magnectic field produced by moving electrons to somehow compute the current flow?

  3. You can try the program and become more familiar with it.


    As for the components of the program, I'm sure that the company that made it would want to release such data. Mayb if you have a more specific question, you could email them requesting help.

  4. Hi kerem ,

    In order to use a torrent file, you need a client to open the .torrent and start downloading the file the torrent file "links" to. Two good torrent clients are azureus and BitLord.


  5. Wow thats a great collection. It is possible for you to upload the following as I am currently unable to download such a large file.

    BALL, S. R. (2001). Analog Interfacing to Embedded Microprocessors - Real World Design

    CARR, J. J. (2002). RF Components and Circuits

    KESTER, W. (2003). Mixed-Signal and DSP Design Techniques

    PARR, E. A. (2003). Programmable Controllers - An Engineer's Guide (3rd ed.)

    VAN SICKLE, T. (2001). Programming Microcontrollers in C (2nd ed.)

    --thank you  ;D

  6. Well if you need a counter to count 3 digits, I would use a cascaded decade counters. One decade counter per digit, therefore I need 3 decade counters for 3 digits. The 3 decade counters allow me to count 1000 different states (0-999). The output is usually in binary form. To make it more readable i.e. decimal, you would need to feed the outputs of each decade counter to a BCD (Binary to Decimal Decoder) chip. From here the output of the BDC goes into a 7 segment LED display.

    Keep in mind that each decade counter needs its own BCD decoder chip and each BCD decoder chip needs its 7 - segment LED display.

    As for the which IC chip to use for the decade counter, I'm not sure. I usually make my own decade counters from cascaded JK flip flops(4 flip flops per counter). Mayb if you search google for decade counter IC chips, you may find a suitable one to purchase.

    If you do decide to use the above method for a counter, you should look up the pin configurations for the 7-segment LED and try to figure out how to carry the signal from the BCD to the 7 segment. Usually (on the BCD) upper case letters are for the inputs from the decade counter and lower case letters are outputs to the 7 segment LED.

    sundar_milo's suggestion on using the ripple counter is also a good way to go. The same principles of BCD to 7 segment still apply.

  7. If you have to change the resistor, replace with an equivalent resistor. The reason for the high wattage (high power dissipation) is to handle the excess current through it. Replacing it with a lower wattage resistor such as 1/2 W or 1 W will only introduce problems.

  8. What exactly do you need help in?  Is it schematics, theory or something similar.

    Here is a project with a (28) LED clock.

    Its about mid-way down the page.

    IMO, this seems like a rather difficult project for a 2nd semester engineering student. I spent my first two semesters doing most of my math and physics courses.

    --Good luck  :)

  9. could u contact me to talk about electronics.

    because i'm a student of technical engenering school.
    i just want to know a lot about electronics for my project.

    Welcome to the community oryza  :)

    Since this is an online community most discussions should be left for the forums. If you need to know something specific about electronics or need help with your project, dont hesitate to ask, the folks down here will be more than willing to help you.

    Please check out the links to ebooks that we have.

    If you look around, you'll find more.

  10. I dont know how the other guys do it. But you can find some books by using a p2p program such as emule. You can also search the bittorrent network.

    You can search for edonkey/emule files here

    Once you've what you are looking for, open the ed2k link with emule. http://www.emule-project.net/home/perl/general.cgi?l=1
    Note: you can also search the emule/kad network directly from the emule program.

    There are probably other ways to obtain these books that I'm not aware of.

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