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  1. MP1

    IC problem

    You have data bits on this line, which are just pulses. Use a scope or other device that will allow you to watch the pulse stream and compare with the other ports. By working your way through the circuit, you will be able to find the place where the signal stops. MP
  2. MP1

    PCB drill press design

    Dremel makes one. The dremel fits in it perfectly....or did you already know this? MP
  3. MP1

    Stepper problem

    Forgot your second question.... You can find out which windings are connected by using an ohm meter. The windings will read like two resistors connected in series and the center tap is half the resistance of the ends of the coil. Hope that helps. MP
  4. MP1

    Stepper problem

    Yes, in some cases, you can run a stepper directly from the micro. However, your micro port pins are limited on current and if the stepper all of a sudden draws more current, poof! goes the micro. The ULN2003 is good insurance. MP
  5. MP1

    0 ohm resistor

    Zero ohm? All wire has some resistance. You can look at a zero ohm resistor as a value with not enough resolution. Add the decimals places and you would have some small value there. MP
  6. MP1

    Type of heat sensor used in a digital clinical thermometer

    In a search, I found medical clinical digital thermometers with accuracy ranges from 0.1 deg C to 1 deg C. You can pretty much choose how accurate you want it to be, then spend accordingly for the parts. MP
  7. MP1

    0-30 Vdc Stabilized Power Supply

    The circuit designer's list is the one that is in the project. The designer has made no changes. The list above are modifications suggested by a forum member. MP
  8. MP1

    3-Axis Stepper Controller

    This chip would not power steppers needed for such a project. You need something like a L297 and L298 combination to get enough power. Steppers are rated in torque. You should be able to calculate the motors needed from the torque rating if you know what it is. Actually, this is something you...
  9. MP1

    relay question

    That is not actually true. The first step is to check the data sheet for the relay you are using. If you are using a 5 volt relay with a 6 volt maximum allowed, you are slowly killing the relay by using 6 volts. You also have the worry of surges on the circuit causing the voltage to fluctuate...
  10. MP1

    plz help me out !!

    It is rare to see anyone go through the trouble of making a project and then posting it if it does not work to begin with. In most cases, I see simple things like component drawings backwards, a line in the drawing that gets connected to the wrong lead or is missing a connecting dot. These are...
  11. MP1

    FM impedance antenna matching

    1 euro is approx 1.25 USD, so the price from Mouser is pretty close to what you have been paying for this part. MP
  12. MP1

    plz help me out !!

    How do you know these projects do not work if you have not built them and rely on comments from someone else who has also not built them? Most projects have links to the author. Why not contact the author directly? mailto:[email protected] MP
  13. MP1

    Pool water level stabelizer

    You're not going to see electrolysis effects for a long time. The chlorine would have a bigger impact than electrolysis. In fact, chlorine is going to be harsh on a reed switch. Also note that a floating magnet setup will act erratic. Instruments that use a reed switch and magnet have the reed...
  14. MP1

    Newb Question: 12v-80ma transistor switch

    hehehe.... here we go again  ;D MP
  15. MP1

    MOVED: HELP:about dc power supply

    This topic has been moved to Circuit/General Requests. http://www.electronics-lab.com/forum/index.php?topic=7234.0
  16. MP1

    FM impedance antenna matching

    13.8V will not hurt a 2N3866. Mouser has them as their PN 610-2N3866 @ $1.50 each. They are also sold by Futurlec, Digitron, American Semiconductor, Electronic Surplus, Ocean State Electronics, and American Electronic Resource. Searches can easily find thousands with PartMiner, Global Spec., and...
  17. MP1

    Pool water level stabelizer

    I see no problem with it. I assume you would use a float type switch? Something like this? http://www.homesecuritystore.com/ezStore123/DTProductZoom.asp?productID=1075 You know, if you find something on the market that you like, you can go here: http://www.uspto.gov/patft/index.html to find all...
  18. MP1

    Pool water level stabelizer

    I'm not sure how you were going to connect a switch, but DC voltage will not hurt anyone in the swimming pool. A good finish on the electrode will allow it to last for a long time. If you connect a float to a switch, you would not need transistors. However, I tend to worry when someone talks...
  19. MP1

    Pool water level stabelizer

    A couple of rods in the water will not be a reliable trigger for your circuit. There are two parts to the circuit here. One part is the trigger from the pool water. The other part is the control switch to turn the relay on and off. Also, I am not sure where I got this drawing. There is...
  20. MP1

    Pool water level stabelizer

    Rybitski, You would want a little more control than that, but you have the idea. Here is one example. MP
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