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  1. MP1

    Help me make a spark!

    Making a detonator, huh? I am sure you will figure that out without my help. MP
  2. MP1

    Double sided PCB, how to?

    The method in the article you posted will work fine for larger pads. There is nothing to cause precision and in the taping process, there is usually a small factor of mis-alignment. But for smaller pads, you might want to consider this method: Pre-drill or punch the mounting pads on your board...
  3. MP1

    Phonline Diverter (my first project)

    without an external power supply it looks like something that is going to cause you problems with your phone company. You will need to completely isolate your circuitry from the phone line with isolation transformers. You mentioned them, but I do not see them in your drawing. If your phone line...
  4. MP1

    Weird circuit

    Kevin, please post the circuit. I think you are having fun with a riddle? MP
  5. MP1

    laser idea

    A laser pen will not cut. This is done with a different frequency of laser and uses a much higher power supply. I do not mean to discourage you. Many on this site are interested if you would start such a project. As ante has stated, proceed with caution. It is very dangerous. MP
  6. MP1

    DC 12 Voltag to 24 DC

    Rhonn, what did you measure as current out on the doubler design with the TDA2004? MP
  7. MP1

    Small intercom system design

    Welcome to the forum. Here are a number of links for a wide variety of intercom schematics. Hope it is helpful. http://www.rcrowley.com/clonecom__schematic.htm http://www.austriamicrosystems.com/04segments/communication/pdfs/AN2507.pdf...
  8. MP1

    3-Axis Stepper Controller

    Alberto, assuming you have used the slowest delay possible so that your pulse is not faster than the device you used to test it, then I would believe you might have a problem with your parallel card. I cannot see how the program could cause this problem since the program only tells the processor...
  9. MP1

    6V to 12V question

    Yeah, transistor markings are a hard one. Depends a lot on the manufacturer. Sometimes they just have a factory code on them if you buy them in bulk quantities. You are lucky when you get the ones with the part number and company insignia stamped on them. Take a look at the surface mount ones...
  10. MP1

    3-Axis Stepper Controller

    Hi steven, these are good circuits for a DC variable speed motor, but a stepper motor works a little differently. These motors have multiple windings which are pulsed in a certain sequence in order to turn the motor a very small precise distance with each step. Some are set up to move 0.9...
  11. MP1

    3-Axis Stepper Controller

    Gene, if you can post what you have on this circuit, I am sure someone on this forum can help you with the questions. There are several on this forum who have put together stepper projects. There are also some stepper projects in our projects section of this site. Is yours similar to one of...
  12. MP1

    Stepper Motor Circuit

    jazcannon, Have you found a suitable design for your stepper? MP
  13. MP1

    6V to 12V question

    The arrows pointing down are the schematic symbol for your ground plane, which is also connected to the minus side of your battery in this project. MP
  14. MP1

    DC 12 Voltag to 24 DC

    How much current is needed? For low current, you can use DC-DC converter chip such as the ICL7662. MP
  15. MP1

    help with LCD power

    Audioguru: You are reading the data sheet wrong. ..BTW, I did not have a problem with the LM317. Worked on paper and worked well in real life. Applications engineer at National agreed with me on that one, by the way. Since you were so sure of yourself, I posed the question in an unrelated...
  16. MP1

    3-Axis Stepper Controller

    Alberto, you should have 5 volts coming from the parallel port. Perhaps you could check these pins with the UCN5804 disconnected. It is also necessary to add a large delay to the program or you will not get a good voltage reading. This is a fast pulse of 5 volts, so it will be hard to measure...
  17. MP1

    part replacement

    5 volt peak to peak is considered line level in audio applications. MP
  18. MP1

    help with LCD power

    Sorry audioguru, but I know how to read a data sheet. Pour through books of them in a typical week. Those are not minimums. Those are the specs they used for traceability. See where it says "Test Conditions"? That means this is the voltage they used to test it. It does not state or mean that...
  19. MP1

    part replacement

    I see audioguru is trying to squirm out of this by changing the subject. His statement was that they are not suitable for audio application. Trigger is absolutely correct. They ARE useable and suitable for audio applications. There will always be a better part that one can use. The industry...
  20. MP1

    help with LCD power

    I would guess that your problem was in the ripple. Of course you need more voltage if you do not take care of ripple properly with the correct value of capacitor. It is a simple rule of design. I design microprocessor projects with this regulator all the time and have been for years. I have no...
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