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  1. MP1

    voice activated door locking system

    Samartha, I have changed the subject to reflect what you are making. You will normally have better responses when you use a real subject instead of a call for help. MP
  2. MP1

    Speed-limit Alert PLEASE HELP!!!!!!!!

    Pieter, I suggest you continue to try contacting the author. I have e-mailed him a number of times and have had no problem with replies after a few days. Perhaps he is on holiday. In a past conversation, Red has told me all of the projects he posts on his site have been bench tested. MP
  3. MP1

    Electronic Eavesdropping Devices Detector

  4. MP1

    3-Axis Stepper Controller

    This chip is capable of 1.25A Maximum, which is pushing it to the limit. MP
  5. MP1

    Forum rules?

    The rules are here: http://www.electronics-lab.com/forum/index.php?board=;action=register But you will have to delete cookies on your computer before you can access it. The cookie on your computer from this site identifies you as a user who has already read them and will allow you to log in...
  6. MP1

    Humanoid with artificial intelligence and emotions.

    this is really the point that we differ. Example: Thomas Edison had 3 years of schooling, could not cope in the education system, and had no electronic experience other than being a telegraph operator. After moving to Boston, and acquainting himself with Alexander Graham Bell and Benjamin...
  7. MP1

    Forum rules?

    Yep. We could lose our site. MP
  8. MP1

    ACTIVE AUDIO FILTER

    Here is also a tutorial that I posted a few years ago to build and calculate your own. MP State_Variable_F.zip
  9. MP1

    ACTIVE AUDIO FILTER

    Here is one such chip. MP UAF42_Universal_Filter_IC.pdf
  10. MP1

    Automotive 12V to +-20V converter

    Jonathan, Thanks for your contribution to the site. It seems that every time you post a new project, you are challenged by someone who thinks you made mistakes (like when you posted the temp controlled fan). I hope it is not discouraging to you. Very good work! MP
  11. MP1

    Humanoid with artificial intelligence and emotions.

    ...on the other hand, a project that seems like it is too large in your eyes might not be so for this individual. Since you do not know what resources they have available to them, you are jumping in with a mind set to tell someone they are not capable of something. You are also looking at the...
  12. MP1

    Digital Logic Problem

    Not much current draw on this chip. How did you connect the supply? Pin 7 for GND and 14 for VCC? If you think you have a supply problem, you can try battery power. Be careful to not exceed the recommendations. MP
  13. MP1

    LIGHTENING STRIKES

    Hi Dazza, Current always flows from a negative potential to a positive potential. Since the flow is determined by the positive and negative charges, it is flowing to the ground. (Negative particles along the cloud bottoms attracted to the positive charges on the ground.) MP
  14. MP1

    ACTIVE AUDIO FILTER

    You are wanting to use the wrong chips for an easy off the shellf active filter. These are meant to be controlled with a microprocessor and they need a clock control as well. There are basic active filter chips out there. MP
  15. MP1

    LIGHTENING STRIKES

    Prateek, Thunderstorms are formed when warm air rises quickly from Earth into the sky. As the warm air cools, it forms rain clouds (cumulonimbus). As the warm air continues to rise and cool inside the clouds, it drops water and ice. Lightning is caused by electricity moving in between clouds or...
  16. MP1

    Led display Digital Voltmeter question

    I normally use an ICL7660 for a negative supply on mine, but the datasheet for the ICL7106 and 7107 shows how to use a CD4009 and some diodes to generate the negative voltage from the oscillator pins. This is probably the simplest. The negative side does not need much current. MP
  17. MP1

    Choice for digital oscilloscope?

    Hello Kain, I just now noticed your post, but I would have also suggested the Tektronix scope. I have used them for years and they are very reliable even if there were no additional features. MP
  18. MP1

    Universal Active Filter IC

    quantum, The schematic of the chip is on page 1 of the data sheet. You could make the circuit with op-amps and the few discrete components shown. MP
  19. MP1

    transformer windings

    Kevin, With the transformer out of circuit, check the ohm readings between the different taps. This will give you the information you need about the windings and which are connected to which. Then you will be able to draw your own schematic of the transformer windings. It is possible that you...
  20. MP1

    Duplicate threads and circuit requests.

    Alun, Microelectronics is defined as the branch of electronics that deals with miniature components. 20 years ago, this would have referred to all ICs, but today it refers to microscopic electronics. Conversations regarding this might be in the order of using microscopes to solder and other...
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