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  1. MP1

    What are Solder Pots used for

    I keep a small one on my workbench for tinning wire ends. Makes quick work of it and always makes a much nicer wire end than using a soldering iron. MP
  2. MP1

    3-Axis Stepper Controller

    Good to hear you are making progress! MP
  3. MP1

    circuit design

    I have never used the feature for pin 6. You will not hurt anything for trying it out. Perhaps you could add a shunt so that it can be high or low if you decide to change. Pins 4 and 7 are already at 5V because of RP1. Have fun! MP
  4. MP1

    3-Axis Stepper Controller

    If you have checked the time for delay on the pulses and you are confident that this is not the problem, I would check over the connections to the board and just make sure you did not miss something. Next, are you sure your 1 A power supply is sufficient? Depending upon the stepper, you...
  5. MP1

    circuit design

    I see no reason that this would not work. You also do not need the part of the schematic with the 555 if you will send the pulses from a micro instead of using the on-board pulse stream. In other words, you can eliminate U1, R1, R2, R3, C1, C2. You only need to write a sequence to J3-2. The...
  6. MP1

    Shutter Mechanism

    Pinball machine comes to mind.... you know, those things that were popular before video games came around..    ;D MP
  7. MP1

    analog to digital converter

    Have you looked in the projects section of this site? There is a link at the top of the page... or follow the link below to the digital voltmeter project: http://www.electronics-lab.com/projects/test/007/index.html This project will give you a LED display reading of your voltage. Not sure why...
  8. MP1

    Cold Heat Soldering Tool

    Yes, I am aware many things do not carry a patent. Thanks for the link. Mac L: Thanks for bringing up the subject of patents. "Patents in general" might be an interesting discussion for a new topic. MP
  9. MP1

    help plzzzzzzz

    Thanks gogo, I forgot to mention the BCD to 7 segment display ICs. Shahzad: Here is a little diagram to get you going with the 4511 that gogo has mentioned. MP
  10. MP1

    Cold Heat Soldering Tool

    How does one go about looking through patents? Is there a URL link that you know? I know that it is public knowledge and that you could go to the patent office to look through items by category, but I have not seen an internet link. Was just wondering if anyone knew. MP
  11. MP1

    circuit design

    Hi Queen, J3 in your link are digital inputs. These should be connected to a micro or computer. A low would be 0 volts and a high would be 5VDC. J3-1 is self explanatory. Ground. J3-2 is a connection for the pulse stream that provides steps to the stepper windings. J3-3 will cause the motor to...
  12. MP1

    help plzzzzzzz

    shahzad, This is a very hard question since it depends upon what is being converted to a display. Some examples: Direct connection from parallel port is possible. No ICs. A digital signal from a micro controller can be used without any ICs, whereas an analog signal will need a little help. A...
  13. MP1

    need a simple project

    tiki, I also wanted to point out that there is a button at the top of the page named "Projects". Click on this link and you can view the many projects posted on this site. MP
  14. MP1

    Embedded System wave file player

    The drawing is somewhat over simplified, but what you are wanting to accomplish is posted all over the web as a mp3 player. There are schematics, etc. Actually, that brings me to the question: Don't you want to use mp3 instead of wav, since the same sound file in mp3 format is about 1/10th the...
  15. MP1

    what CMOS & 8-pin IC do?

    Not much without a little help....  ;D MP
  16. MP1

    Why electronics-lab takes longer time to appear

    .....dial up? If you can get a faster connection, you should. It has been years since I had dial up, but as I recall, I used to almost fall asleep waiting for pages to load up. MP
  17. MP1

    digital voltmeter build confirmed

    Dennis, This type of feedback is appreciated. I also agree that the other thread has become so large that many will not read all of it. In fact, the schematic was corrected after much of the discussion about problems with it. I have no intention to merge this with the other. Project looks good...
  18. MP1

    3-Axis Stepper Controller

    Have you checked timing? How much delay between your pulses? Can you try different values to see if it makes a difference? If the pulses are too fast, the motor will stall and/or be very jumpy. There is a learning curve where you find the fastest and slowest possible pulse stream for the motor...
  19. MP1

    90 degrees phase shift

    Here is how it is done for the audio range. Of course, this is for a sound effect. Add or take away phase shift stages as needed. MP
  20. MP1

    Can i get some help in a project>><

    Kevin, I posted a state variable filter tutorial on this site a few years back. It is here: Is this what you are looking for? Hope it is helpful. MP
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