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slackjack

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Everything posted by slackjack

  1. You can download electronics for dummies here: http://www.box.net/public/5hv4jgeo3e#f717969 Check out our electronic resources section for links to tons of other books. We also have the The Art of Electronics which is very good. http://www.electronics-lab.com/forum/index.php?topic=6168.21 http://www.electronics-lab.com/forum/index.php?board=23.0
  2. Well for now I'm going to use windows xp (mayb later I'll worry about interfacing with linux). Ante can you please elaborate on "software". For now I plan to control, but later I will be using sensors hooked up to the computer. I dont understand what is meant by "channels". I guess (talking about the sensor part) ill measure some entity with analog signals then ill have to convert it to digital signals so the computer can understand it. But before I jump that far ahead ill worry about the LEDs and LCD display ;D This 5v you are talking about. Does it apply to the volatge from or to the serial port? What is the typical output volatge from the serial port or is it variable?
  3. None of the files I've downloaded need a code. Most of them are just plain pdfs and rarely rar archives. Thats odd, i dont need to sign up to download files or browse (nor do I even have an account there). Cant you download any files?
  4. Hey guys, I'm now wanting to interface circuits to the PC. Whether if its for data acquisition, control systems or just to light up a few LEDs or LCD display, it just comes down to interfacing. My question is what interface (port) should I use on the computer - serial port, parallel port or USB port? And can you please say why I should use that. --thank you :)
  5. This site has books software, computer, electrical, and electronics engineering. omg its so many books http://www.box.net/public/5hv4jgeo3e#main Enjoy
  6. Is there anyone thats willing to trade/give Bitme and/or oink invites? I have Demonoid and desitorrents invites. I'm mostly interested in Bitme because I heard it has good academic content. --thank you.
  7. Thanks Ante. 4th of July is very noisy around here ;D
  8. Switches are found the "Basic" family. Baisc --> Switch Also rotary switches (4 - 8 positions) can be found in Electro_Mechanical --> Supplementary_Contacts (I think this is what you are looking for).
  9. The 7447 is the BCD to 7 segment decoder. What you have to do is feed the output (binary) into the 7447. Consider the following: Here you can see four inputs - A,B,C,D (the input will of course be the output from your calculator. The outputs a - g, will go to the respective pins of your 7 seg display. This one 7 seg will be able to display 10 states (0 - 9) hence thats why we have 4 binary inputs (1111 base 2 is 9 base 10). Here is an example of the pin playout:
  10. Hi misha14, I think you indirectly answered what decoupling means. It used to block dc signals i.e. it prevents the mixture of the ac and dc signals. In order to do this we can use a capacitor, which btw has an infinite resistance for dc, therefore it blocks it and lets the ac signal through. It can be placed in series with the source (that needs amplifying) or at the output of each stage for a multi-stage amplifier.
  11. Hi misha14, Here is something similar to what you wanted. http://ourworld.compuserve.com/homepages/Bill_Bowden/opamp.htm
  12. Hi MP, Whats the best time do this? Should I wait to finish my junior year first so I gain some more background in theory?
  13. Thanks for the unlocker tool Kasamiko. But sad to say that it does not work, yes the rename feature of it does not work on my desktop. An error pops up saying "Cannot rename file: Cannot read from source file or disk". Logan, the reason for it being renamed is becuase these are all file names reverved for the system. Trying any of these will also result in "New Folder". CON, AUX, COM1, COM2, COM3, COM4, LPT1, LPT2, LPT3, PRN, NUL ;)
  14. Thats a neat little trick Ante. But it does not work on my desktop (from win explorer). It works for other folders and files that are not located on my desktop though. I know that it is trying to rename because I hear a beep that usually sounds when a user tries to do something that windows wont allow. One way I can solve my problem is by moving the folder or file in question to another part of my drive and rename it but this gets highly inconvenient. It seems that the permissions on my desktop are messed up, any idea on how to change this? :)
  15. Hi rigdoctor99 ;D I guess I forgot to mention that there is no rename option in the properties of the folder. In the attributes section of the folder, read-only seems to be automatically selected everytime I make a new folder. Unchecking it and applying the changes does nothing.
  16. Hey guys, I have a problem. I'm using Windows XP Pro and I cant seem to rename folders on my desktop or folders within folders on my desktop. I am logged in as the admin. Any help? --thank you :)
  17. Hi audioguru, I'm just curious, why did you use the LM3915 instead of the LM3914. I would like to know what requirements you based this on.
  18. Are you requesting this book or did you just forget to upload it?
  19. Here is a brief intro to semi-conductor physics I uploaded some time ago. http://www.electronics-lab.com/forum/index.php?topic=6168.42
  20. Thanks for mentioning that Zeppelin. I checked out the site and found this: http://www.sonsivri.com/forum/showthread.php?t=1209 All Elektor magazines from 1995-06. Sweet!!! Its like a gold mine out there.
  21. Thanks for the input logan. I'm currently trying to make the transition from whatever theory I know to practical applications. But unfortunately its not going as smooth as I thought it would. Mayb I just need to work on a few more projects. I plan on doing this extensively during the summer vacation. :)
  22. I will be graduating in 2 yrs with a bachelors degree in computer engineering. I want to know whats the best way to prepare for the "real world". What should I start doing from now to best prepare myself for post-college jobs. I want to avoid receiving a blow in the face. Any advice would be great. --thank you :)
  23. The LM3914 looks very neat. According to this website they say that it has a LM317 voltage regulator built in. Is it a good idea to use this IC for both regualtion and voltage display?
  24. I plan on using comparators instead to indicate voltage levels. For now I experiment with 3 different voltages - 5V, 12V, and 25V. I plan on using the LM741 general purpose operational amplifer. I have a problem with this circuit though: V1 is used to represent the reference voltage (connected to the non inverting input). I set up a voltage divider so that each 741 has its own reference voltage. V2 is used to represent the output voltage from the power supply. V3 supplies +-Vcc to both comparators (and is also the voltage source for the LEDs). The forward voltage drop for the LED is 1.8V and activates at 2mA. I calculated that the current limiting resistors should be 3600 ohms. What did I forget to add to this circuit (or connected wrongly) because it does not work?
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