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  1. MP1

    star trek style sliding door

    electrodoc, I do not mind a few pictures of the mechanism. It is an electronic project. This will explain it a little better, I think. I would be interested to see how it all works together. MP
  2. MP1

    Circuit allowing ac to operate a dc relay

    and I would add a cap just before the bridge... MP
  3. MP1

    "Power?" Inverter

    I have not yet heard that this re-engineered device works. Has someone built it? ...and who on this site has had the inverter that we are discussing here blow caps or come close to being injured? I would like to hear some input. Other than yours. You seem to be the only person on this forum...
  4. MP1

    3-Axis Stepper Controller

    It would be a 4.7K ohm resistor tied to the 5 volt buss. If the switch is not very good and has a lot of bounce, you might get additional triggering. If this is the case, you will have to add a debounce circuit to the switch, which is just a digital gate and some components around it. 1 step is...
  5. MP1

    Electronic Stethoscope

    CDAK, Thank you for the feedback on this project. Also, if you would like to forward your modifications to the circuit, we will have them posted for the next person who is considering this project. From your description, it seems that the circuit worked fine with removal of the preamp and a...
  6. MP1

    Analog/Digital GND

    audioguru, I work with them every day. It is not the opposite. It is both. I only mentioned the side that I work from. It can happen both ways, which is why they are separated. Add a motor to a microprocessor circuit without the separation and tell me that the microprocessor can handle it. Not. MP
  7. MP1

    "Cannot Connect", again and again

    I did just get the following error message when changing to a different forum area: Fatal error: Cannot redeclare phpadmentor_maxinttonull() (previously declared in /home/electronics-lab.com/www/advertising/phpadmentor_config.php:18) in...
  8. MP1

    "Cannot Connect", again and again

    ...still no problems here. Note that the clock keeps the timezone of the server it is on. Not necessarily your time. MP
  9. MP1

    Transformerless power supply

    Siddharth, have you been hearing ante? It is dangerous. But if you must, then the answer is yes. You can build one of these for any voltage that you need. Just choose the appropriate zener value and calculate the series resistor for the current. Those are the only changes that will matter for...
  10. MP1

    Project Help

    Yeah, I have always hated BMPs. Glad to know this is workable for others. I still use eagle for schems, though. Drawing all the parts each time in Paint does not appeal to me. MP
  11. MP1

    Analog/Digital GND

    It is necessary in a layout which uses digital devices and analog devices to use a different voltage buss on the circuit board for each. These ground busses are then connected at one axis. This keeps the digital circuitry clean of the transients introduced by the analog circuitry. MP
  12. MP1

    Power supply for AMP in CAR

    Sure, lots of devices use this array. As it stated in the pdf that I posted, it is for speed of transition. I do not understand where you think there is an argument....unless you mean you are arguing with the contents of the article that I posted. MP
  13. MP1

    Project Help

    In case this will help anyone: The standard "Windows Paint" program found in "accessories" will convert files. When you open a file in the program, you can "Save As" a different type. If you use "attributes" you can change the size of the file. If you are using Adobe Acrobat 6 to read pdf...
  14. MP1

    Impedance matching

    kevin, perhaps I am not understanding, but I thought you wanted to find the resistance of wire when knowing the thickness and length. If this is the case, there is a nice little calculator here at the link: http://www.mogami-wire.co.jp/e/cad/wire-gauge.html MP
  15. MP1

    Night rider scanner

    Micros have non-volatile built in. ;D MP
  16. MP1

    Why are PCB's green on the trace side

    FlipFlop, the material you see on the boards is called solder mask. It is cured at about 300 degrees F after it is silked onto the boards. Normal quantity is 5 gallon container or larger. For the hobbyist, you can get a similar spray on material. I have seen it at www.pulsar.gs in the past. I am...
  17. MP1

    0-30 Vdc Stabilized Power Supply

    EIST, the solution of using a battery would be a simple solution. As you have stated, the alternative is to use a transformer. The voltmeter needs a different source than the voltage which it is measuring. If you could describe something about the rest of the project, maybe we can come up with...
  18. MP1

    Re:Transistors discussion

    All: Here is a link to an article on transistor history. It is very interesting. http://www.pbs.org/transistor/ Actually, I think there were quite a few who knew quite a lot about transistors since it's development in the late 1940s. MP
  19. MP1

    Open Circuit Test

    Siddharth, thought you might be interested in this circuit: http://www.web-ee.com/Schematics/AudibleCircuitTracer/AudibleCircuitTracer.htm It is a circuit "tracer", which would be more of what you were talking about. MP
  20. MP1

    Transformerless power supply

    siddharth, the resistor before the zener is calculated as follows: You have a different voltage on each side, input voltage on the one and zener voltage on the other. Subtracting these voltages gives you the voltage drop of this resistor. Figure out how much current you need through this circuit...
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