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  1. MP1

    LCD Backlight

    AJB, there are others as well. One must read the data sheet for the specific display. MP
  2. MP1

    EAGLE. Is it a good choice?

    Usually, the board manufacturer will use what is called a GERBER file to make the boards. Because of this, you do not need to convert between the different programs. This is the main reason why you do not see conversion programs for the different PC Board programs. The GERBER files are the...
  3. MP1

    URGENT HELP PLEASE

    Vinod, welcome to the forum. Some members do not read the posts if they are not familiar with the subject. Posting with topics like "Help" or Urgent" are not read by many. You will have much better luck with subjects like "Looking for Wireless Trasnsmitter" or "Radio Schematic Needed". MP
  4. MP1

    "Power?" Inverter

    I have merged this one with your original posts. They are now all here in this thread. MP
  5. MP1

    Newbie question on terminology

    shekhar, Tri-state refers to a feature of some digital devices which allow a connector (pin) to either act as a normal output, drive a signal onto a line, or to be "tri stated" which is setting it to a high-impedance ("high Z") condition. This allows other outputs to drive signals onto the same...
  6. MP1

    eq. or parametric analizer

    Mark, Welcome to the forum. Please ignore the offensive ridicule by audioguru. This type of equipment is usually connected to the output of the pre-amp to save a lot of expensive circuitry. The values are calculated and thus you have the levels at the power out. Such a circuit as you have...
  7. MP1

    Site's Clock

    Such a trivial matter. Nineteen minutes off? Why not just send him a private message to let him know? When he is busy checking trivial things like clock punctuality, do not grumble when other matters are not tended. MP
  8. MP1

    3-Axis Stepper Controller

    David, The forum was loading pages real slow for a week or so and people were not posting. In answer to your question about opto-isolators, some recommend to never connect your PC to the outside world without isolation. However, I never use isolation on my personal devices and I take a high...
  9. MP1

    European applience in North America, question

    Suraj, I understand that sasha is using a 240 VAC outlet. Niot the 120 VAC. Both are available in North America. MP
  10. MP1

    LM317 circuit doesn't supply enough current (only 20mA)???

    Audioguru, If he only has 20 mA available before the regulator, he is not going to get 90 mA at the output of the regulator. I do not understand your comment that measuring the current ahead of the regulator will not tell him anything. It will tell him a lot. For example, when he is not able to...
  11. MP1

    LM317 circuit doesn't supply enough current (only 20mA)???

    Perhaps I missed this in the posts, but I do not see where the input current was measured. The regulator will not give you current that is not available ahead of it. Measure the current ahead of the regulator. If you only have 20 mA available ahead of the regulator, you are not going to get...
  12. MP1

    What is Switched Capacitor D/A converter

    Here is a link that might help. http://www.analog.com/UploadedFiles/Associated_Docs/515845288752089293027389Power_sect4.pdf#search='Switched%20Capacitor' MP
  13. MP1

    Led display Digital Voltmeter question

    Zwieke: I do not think this device will handle the current you are wanting to measure. Please look at the maximum ratings on the data sheet to be sure. Burr1: These two capacitors are the power supply bypass caps. There is a wide variety of what will work and it is dependent upon the power...
  14. MP1

    square wave to sine wave converter

    Here attached is some info I found in my archives regarding square to sine conversion. Hope it is helpful. MP square2sine.pdf
  15. MP1

    How to control the motor

    Tommy, It sounds like you are trying to describe what is called an H - Bridge for the motor control. It is built with 4 transistors. MP
  16. MP1

    New areas and new moderators

    Nice to see some new areas of interest. I would like to take a moment to welcome the new moderators! MP
  17. MP1

    Where to buy single capacitors?

    You do not need to know the manufacturer of the chip. These companies carry many brands and can help you determine this. Are you trying to match up a component in something you are repairing or are you just looking for capacitors of a specific package type? MP
  18. MP1

    Help: Circuit Design 4in NOR Gate

    A resistor from base to collector would be a good insurance policy. This problem has hit me in the past, so I highly recommend it from experience. You are correct that the gate should be either logic high or logic low, but when something causes it to become unstable, you sometimes see levels in...
  19. MP1

    Where to buy single capacitors?

    You can get help from the digikey website by contacting their technical support link. They will be able to give you specific part numbers and pricing. I think Mouser is good in this area as well. MP
  20. MP1

    Help: Circuit Design 4in NOR Gate

    Simon, Audioguru has given you some good advice. I only have one addition: Add a resistor from the base of the transistor to the 12V supply. A good value is 10 times the value of the base resistor. You want to have a pull-up here at all times unless your chip pulls it low. This will insure...
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