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Everything posted by slackjack

  1. Use google translate. http://www.google.com/translate_t
  2. Well a wave the lags a sine wave by 90 degrees is a -cosine wave. When we integrate a sine wave, we get a -cosine wave. To do this you could use an operational amplifer configured as an integrator. The output voltage is: Notice that the integral has a negative (-) sign. Well the negative cosine and the negative integral will cancel out to give a postive output. To get the -cosine, feed the output to an invertor with a gain of 1. I'm not sure how good this method is at replicating distortions though
  3. 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. http://www.ibiblio.org/obp/electricCircuits/Semi/SEMI_8.html#xtocid1828610
  4. Thank you so much Ante. You're awesome. That little book is exactly the type of info I'm looking for. :)
  5. 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?
  6. You can try the program and become more familiar with it. http://www.iliumsoft.com/site/ew/ewallet.htm 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.
  7. Its there any way to measure current in a circuit without actually placing the ammeter in series with the component? Mayb there is another special device that does this? --thank you :)
  8. 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. http://azureus.sourceforge.net/ http://www.bitlord.com/
  9. Its about time we knew what this book was called ;D
  10. You guys spoke about this about 1 year ago. Where is the newbie section ;D
  11. I must say that BitLord makes it way easier to unselect and select stuff. ;D
  12. Thanks for the input Ante. I now remember that azureus offers this feature. :)
  13. 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
  14. WHat is this Elektor thing about ??? I've never heard about it.
  15. 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.
  16. slackjack


    If I wanted to know the inners or how an electronic component works, I would first check http://electronics.howstuffworks.com/
  17. I do believe that putting an inverter in series with the cathode of LED will fix it.
  18. I believe the wiki link that hotwaterwizard gave you contains some info on the architecture.
  19. Does anyone know what topic the book is about?
  20. I'm a new user to spice(2G.6). I have a problem with labeling my nodes. Below I attached the circuit. Here is my netlist: Example netlist V1 1 0 dc 12 r1 1 1 1k r2 1 2 1k r3 1 0 1k .end I get this error: Less than 2 connections at node 2. How can I correct this? Is there any guides that I should follow when labeling nodes? --thank you.
  21. 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.
  22. I see no reason why it should not work with a 640 khz signal from the function generator.
  23. Hello, You may want to read this. It gives some theory and the circuit components needed. http://ww1.microchip.com/downloads/en/AppNotes/00238b.pdf ;)
  24. 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 :)
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