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Everything posted by slackjack

  1. Hey all, I'm curious. How can ohms law be dervied. The only way I can do it is by experiments. How do we arrive at V = IR without any experiments. Thats all ;D --thank you.
  2. Hi claudiorfernandes :) Welcome to the forums. Hope you will be an active member here.
  3. If you google for converters, you'll find tons.
  4. I'll definitely put it in. I have a page about online communities, ill drop it in soon ;D
  5. Hey all, I scrap my first project that I posted some time back. I started a new one called Free Engineering Online. It contains links to engineering, physics and math video lectures. There are also links to tons of ebooks. There is also a Discussion Board to go along with it.
  6. Hey all, I just started my website using google pages. Its a collection of ebooks, video lectures, and projects that cover the areas of physics, math, electrical/electronic engineering. Do check it out: http://linuxfreak87.googlepages.com/ Its a great resource if youre a college student. --thank you.
  7. I've heard this term somewhere, but I'm unsure as to what a switching diode actually is. Can someone please explain it to me. --thank you.
  8. btw, the last of your requested book can be found here: http://www.electronics-lab.com/forum/index.php?topic=6188.0 re (reply number 4)
  9. You may find some good robotics books here: http://www.box.net/public/5hv4jgeo3e#f653820
  10. I havent really given that aspect any thought. I just wanted to "mess around" a little. But since you asked - things like cell phones, cordless phones, radio waves. I guess all of these are above 1KHz.
  11. Is it possible for you to post the PWM circuit?
  12. Hey all, Is there such a software package that uses the computer's wireless card to detect frequencies - not internet signals coming from a router, but other frequencies floating around. --thank you.
  13. So youre trying to minimize power dissipation. So now I must ask how would you choose whether to leave the transistor fully on or off? Yes, that would great.
  14. Is this parameter known as PDmax? I dont really understand why this is so. Also why did you use half the max current?
  15. It makes sense now. Thanks for youre help :) btw, I noticed that you used some dashed lines in the schematic (LED section). Does this mean that I can have as many LEDs without changing component values?
  16. Yes, please do tell the digital scope thats cheaper with all those features you mentioned. I'm very curious to get my hands on it.
  17. Thanks for the replies guys. I've got another question about the circuit that Cabwood drew. Can the circuit be made with only one transistor? Also why wont the LEDS come on just like that, I mean the way I see it the anode is currently more positive than the cathode - shouldnt this cause the LEDs to light up wihtout any variations in brightness? Hey Theatronics , do you by any chance have an example that I can look at (that may also include the PWM circuit)?
  18. Hey Cabwood, thanks for youre reply. But you said that the voltage linearly drops across the collector of Q2, do we really need to have the transistor in there. Couldnt this be accomplised by just the charging and discharging action of the capacitor? Also I dont understand the need for a dralington pair. thanks again
  19. Hey all, I want to make an LED dimmer, that has about 5 LEDs hooked up to a 12VDC supply. They should gradually approach their (near) max brightness. But I want this to be done with user intervention. I just close the switch and the brightness increases (and also the opposite must happen when I open the switch). Can this be done by a capacitor whose charging time is controlled by a resistor? Please tell me the several ways of doing this. --thank you.
  20. I use AIM. For my client I use Gaim. Very simple yet powerful alternative to AIM's client - no ads and that kind of stuff.
  21. Hi opacheco, welcome to Elab. Here are some books that may interest you: http://www.electronics-lab.com/forum/index.php?topic=4807.0 http://www.electronics-lab.com/forum/index.php?topic=5003.0
  22. me confused ??? I thought that this was the best part of the job.
  23. I'll be using TubroC++ for my programs. Is it this project you are referring to Ante? http://www.electronics-lab.com/projects/pc/020/ Theatronics, thanks for the walkthrough, it very much appreciated. But I have decided to use the parallel port as a start becuase I have several books on it ;D Do you have any tips on using the parallel port, mayb some experiments? thanks again guys.
  24. To find out about more jobs opportunities with your degree, you can seek help from your guidance counselor at ITT Tech. It wont hurt to pay the department a visit before classes start and chat with someone. nanop link: http://www.careercornerstone.org/engtech/etearn.htm
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