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  1. MP1

    Free sample chips!

    I have never been asked to pay postage on samples. Not from National Semi or any of the other manufacturers. However, I have a business. Perhaps you tried to get samples as an individual or student? MP
  2. MP1

    RESISTOR TO VOLTAGE CONVERTOR

    If you mean to convert the current on your present system to a voltage, the simplest way to do so is to drop the current across a load resistor and measure the voltage. If you mean is there an easier way to get a 0 to 12.5V output from a 0 to 900 ohms resistance, I am not aware of anything...
  3. MP1

    RESISTOR TO VOLTAGE CONVERTOR

    I must not be understanding what you want because it sounds too easy. Why not an op-amp with your variable 0 to 900 ohms in the feedback loop to give you 0 to 12.5V? If this is not it, maybe you should show what you already have and explain what you want to be different. A drawing works really...
  4. MP1

    Eagle schematic and board editor problems...

    You should be able to figure this from the X and Y coordinates to the left of the code input window which is located above the schematic window. I do not know of a way to just type in the coordinates. MP
  5. MP1

    Digital Microscope Image Measuring Instrument

    Price? MP
  6. MP1

    What is Digital Microscopy and Why Should I Buy A Digital Microscope?

    Please post a price. MP
  7. MP1

    USD$35 manufacture 2layers+2silk+2mask pcb prototype!(CHINA)

    Wouldn't that calculate to about $35 for the board and $100 for the UPS International Priority shipping? MP
  8. MP1

    Electronic formula's ???

    Will this help? It has some Excel spreadsheets that show some of the formulas. http://ece-www.colorado.edu/~bart/book/book/chapter7/ch7_3.htm#top MP
  9. MP1

    Eagle schematic and board editor problems...

    To change the board size, you just click on the corner of the board outline and move it to the size you want. However, if you have the free version, you will only be able to put your parts inside the size contraints allowed by the program. The reason you do not have VCC and GND connections is...
  10. MP1

    line filter

    I think I know what you want to do, now. If you can program a micro, you could connect a port line to the phone line through an appropriate transformer and have it listen for the high pitched tone after it gets the ring signal and produces an off-hook voltage on the line. Obviously, there will...
  11. MP1

    LCD pinout?

    You might try www.earthlcd.com to see if there is a similar model there. They usually have links with data sheets and pinouts. MP
  12. MP1

    3-Axis Stepper Controller

    You could use the UCN5804 outputs to turn on and off power transistors, but then you could also do this without even using the UCN5804 chip. It would be hard to relate the rating to oz/in. since the current ratings of the motors are what you actually calculate. Different gear ratios, etc. would...
  13. MP1

    DOES MIT HAVE A FORUM LIKE E_LAB?

    No one has a forum like e_lab  8) MP
  14. MP1

    LCD datasheet

    You might be able to match it up at www.earthlcd.com Perhaps they have an equivalent or one which looks the same. MP
  15. MP1

    rosin flux

    Yeah, like I said, you could just build your own system. These expensive ones pull the air through a HEPA filter which is pretty expensive in itself. Unless you do a lot of soldering, I would not worry too much about it. A small DC fan to move the fumes away from your face would be a plus. MP
  16. MP1

    rosin flux

    You could probably make something on your own, but here is the Airex model that is sold with Weller soldering stations: https://www.galco.com/comp/SA011599.pdf MP
  17. MP1

    circuit design

    RP1 is pulling it to logic high through a resistor. Leaving it open is essentailly a high. You only need to connect a switch to ground if you ever want to pull it low. MP
  18. MP1

    Ignition coil driver circuits and experiments

    Cooperman, I do not think the "High Voltage" members need to worry much, unless they are making their own vacuum tubes. According to the 4 requirements in your link for a device to be emitting radiation, requirement #4 is "Low gas pressure between cathode and anode, i.e., a moderately good...
  19. MP1

    line in?line out?

    Only_, LINE IN is where your device is accepting or acquiring the audio signal from another source or device. LINE OUT is where your device is sending it's signal to another device. Hope that clears it up for you. MP
  20. MP1

    inverter using step-up chopper

    Inverters usually make a signal by switching the full potential voltage on and off with a transistor and feeding this directly into the transformer to limit the current loss. Your DC-DC converter would lose current in the conversion process, then would still have to incorporate the same charge...
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