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  1. MP1

    High Power LED Mood Lamp

    Hi Nef, I think there was some confusion from the discussion about the different designs on our site and on the author's site. I would recommend building the project as it is on this site and then making any adjustments as needed to get the colors and brightness where you want it. The 10K...
  2. MP1

    Automatic Down All Car Windows

    One method is to use a transistor as a switch that has the base controlled by a 555 timer used as a monostable. You would calculate the monostable for the amount of time needed. If you are not experienced in this, there are actually 555 timer calculators on the web that will help you. It is also...
  3. MP1

    Body Resistance help

    Hi Korslain, Welcome to Electronics-Lab! There are quite a few factors involved in this. Here is a portion of an ohm's law tutorial that goes a little into depth about body resistance: http://www.allaboutcircuits.com/vol_1/chpt_3/4.html Hope this helps. Also note that there are books written...
  4. MP1

    Automatic Down All Car Windows

    The window switching is handled inside the door. Just find the power feed from the switch. You can feed this on a timer since the door circuit will sense a load and nothing will happen if the voltage or switch is activated too long. Note that you will need to tear into all the doors to build...
  5. MP1

    How do I draw a truth table for this!???!

    Are you sure the teacher didn't say "timing diagram" and not "truth table"? 4017 is a decade counter. MP
  6. MP1

    Automated plant watering

    Hi Alex, Firstly, Welcome to the forum! Do you have experience programming a micro? This would be the most interesting way to do it. Otherwise, you might want to use a timer. Either way, you really do not need a water monitor, per se. You just need a circuit that will activate a relay at a...
  7. MP1

    MCU Code extract engineering

    Since this is more related to the author's paid services, it has been moved from the micro forum to the buy/sell forum. Please keep all advertisements for paid services in the buy/sell forum. MP
  8. MP1

    MOVED: GSM modem with Microcontroller

    This topic has been moved to Microcontroller Projects, Programming. It is not about a project in our "Projects" Section. http://www.electronics-lab.com/forum/index.php?topic=8880.0
  9. MP1

    High Power LED Mood Lamp

    No, I have not contradicted myself. Again, I see no point in this thread except your need for argument. MP
  10. MP1

    High Power LED Mood Lamp

    Sounds like you just want to argue..... and you don't even use micros. EDIT: ..."do not use" meaning you do not design projects with, or program micros. There is no point in posting any further here. MP
  11. MP1

    Resonator datasheet needed

    Sure, 10.7 MHZ is a size used for IF, but micros also use various size Crystals for specific purposes. A 10.7 MHZ Resonator (or Crystal) will give you almost 3% less error in RS232 data transmission at 57600 baud than a 10 Mhz Resonator (or Crystal). I don't know what OP purchased since I am not...
  12. MP1

    High Power LED Mood Lamp

    PICs can run hot with no current limiting. Since this program is sending out a pulse and not a steady DC voltage, there is no danger to the PIC. It will just run warmer at certain duty cycles. Personally, I like to use resistors on the output pins of microcontrollers. I am just saying that the...
  13. MP1

    Resonator datasheet needed

    Actually, that is not so. What he has is also used for microcontrollers. They are perfect for this application and much cheaper than a crystal. Just ground the middle pin and either of the outside pins can be connected to either of the clock pins on the micro. I have a drawer full of these for...
  14. MP1

    Skin effect articles

    Here is a calculator: http://daycounter.com/Calculators/SkinEffect/Skin-Effect-Calculator.phtml MP
  15. MP1

    High Power LED Mood Lamp

    Although 10K is a bit more than I would use, either way is fine since the source is a PIC. The project is ok as is. MP
  16. MP1

    Motorola's circuit doesn't work.

    Your circuit is a standard level converter, but the resistor values are high for connection to micro. Try 10K instead of 100K and 3K3 instead of 4K7. Also, the PC should be connected to the 10K and the micro should be connected to the pin marked TTL. Note that this is a one way communication...
  17. MP1

    newbie again! a few questions

    The second power source that you posted a link uses the same circuit as our project here: http://www.electronics-lab.com/projects/power/010/index.html Might as well just build it rather than buy it. I f you just want to jump in, either of these would be good starters. The breadboard is ok, too...
  18. MP1

    Need to design a filter to allow only voice frequencies

    Here is an interesting project done at cornell university: http://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2006/XL76_SL362/XL76%20SL362/index.html MP
  19. MP1

    Need to design a filter to allow only voice frequencies

    sundar, The filter that was posted by audioguru will give you more attenuation than the bandpass filter posted. The reason bandpass will not give you the results you want is that Q is inversely proportional to Bandwidth. As you increase the bandwidth of a bandpass filter (300 to 3K is a wide...
  20. MP1

    Neutral , ground & earth

    "Ground" and "Earth" are actually two different things, but can be at the same potential. In other words, the ground of your circuit does not have to be connected to earth ground, which is the potential of the return or ground of the mains in your service box on the house. This is always at...
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