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  1. MP1

    220V PCB

    This does not matter when figuring trace width. It takes a lot of change in voltage to make a difference. It is the current spec that is more critical for trace size. MP
  2. MP1

    Circuit To switch Between Two Power Sources

    Normally, you only connect the solar cell to the battery and run the device from the battery. The solar cell voltage will change (fluctuate) with different light intensities and will not have the current you require at many times. Regulating this will only waste what you are getting out of it...
  3. MP1

    PC-based Stress Biofeedback Monitor

    Perhaps, being a Computer Engineer, you can tell us why we get this on our computers when accessing your link? (I could not resist making the joke.. ;D  ) MP
  4. MP1

    Charging a 9V rechargable battery using two 9V dc Motors

    oh, I have a transistor radio that is much bigger than that...  ;D MP
  5. MP1

    MP3 PLAYER

    siddarth, this topic has a thread here somewhere on the site. I recall posting a link to a website in that conversation. You might want to use the search feature to bring it up. You will have to use a microcontroller and program it for the data transmission to and from the hard drive. Here is...
  6. MP1

    Special IR Circuit

    This is correct. There is nothing in the emergency vehicle which causes traffic lights to change other than the strobe that flashes when their emergency lights are on. There is a sensor close to the signal light fixture at the intersection which will sense this strobe. When the emergency vehicle...
  7. MP1

    TSL220

    source2, Go to their website at www.ti.com and look for the box that is named "Support". In this, find the link named "All Support" and the sub-link named "Contact Tech Support". On this next page, go to the link on the left named "Contacts" and choose your country. This will lead you to phone...
  8. MP1

    OCCUPANCY SENSOR

    If you are only trying to turn something on when a person enters the room, a simple motion detector can do this. If you want another idea that is not so ordinary, you could make a small particle counter. A small pump pulling the particles through a tube where they must break the small light beam...
  9. MP1

    power point controller

    You can buy these. They already exist. MP
  10. MP1

    JOB INTERVIEWS

    I tell then to bring their calculator. At the beginning of the interview, I hand them a 4 page electronics test. 2 pages of standard questions found in digital and analog courses which are similar to the types of problem solving the technician will be up against every day and 2 pages of trick...
  11. MP1

    MOVED: Padlock Alarm Help

    Duplicate topic. Needs to be merged. This topic has been moved to Circuit/General Requests. http://www.electronics-lab.com/forum/index.php?topic=3863.0
  12. MP1

    Spellcheck Error

    Cody, I don't think the spell checker recognizes most of your words,,, ;D :o (just kidding with you. Please don't take it personal) MP
  13. MP1

    I'M Lost!

    Quite frankly, I think Bill Gates deserves every penny he has made from Microsoft. It is called business. The myth that a monopoly is harmful to the economy is just myth. What harm? The operating system is certainly affordable and you have the technology in a home computer that could only be...
  14. MP1

    MP IS EVERYWHERE

    How flattering ;D  A topic about me. Thanks for the nice comments, guys. Yes, I enjoy anonymity. MP
  15. MP1

    Hum in the incoming signal

    If walid can feel electricity by touching the case (as he stated several posts above) then he has a grounding problem to the case. The case is also the main shielding device. Unplug the unit, and check the ohms from the grounding prong of the power cable to the case. This will most likely give...
  16. MP1

    Most interesting electronics-area?

    We only get to vote for one category? I cannot decide. MP
  17. MP1

    Homemade Capacitor

    If you are also interested in reading the old thread on this subject, it is here: http://www.electronics-lab.com/forum/index.php?topic=427.0 MP
  18. MP1

    Alternative parts

    This happens a lot. The best thing to do in such a case is to find the data sheet on the web and look for another transistor that has comparable specs. It might take a while. MP
  19. MP1

    Dual sided PCB

    After the board layers are assembled and the holes drilled, the board goes through a copper plating process. The holes are seeded with a solution that will cause the plating to connect with copper from all the layers which terminate at the hole. This is done before the tin plating or gold...
  20. MP1

    Speakers

    Steve, MCM Electronics has a good variety of inexpensive good quality speakers in their catalog. They have been around for a long time. Another source is wolferstweeters.com MP
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