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Recent content by maximka

  1. maximka

    220V two wires, why?

    Neutral and ground are very often the same.
  2. maximka

    220V two wires, why?

    In a 3-phase supply with Y configuration two voltages exist: phase-to-neutral and phase-to-phase. The phase-to-phase is 1.73 times the phase-to-neutral (example: 120 x 1.73=208). In Delta configuration only one voltage exists as phase-to-phase. In your case, you may have ether Y or Delta source...
  3. maximka

    how do I use a momentary switch break a circuit?

    You local RadioShack has a few. If you are breaking 5 Amp, go for 10A rating, something like 12VDC/10A DPDT Plug-in Relay Model: 275-218 | Catalog #: 275-218 http://www.radioshack.com/search/index.jsp?kwCatId=&kw=relay good luck.
  4. maximka

    4-20 mA Shielding

    Go fiberoptic with converters at both ends.
  5. maximka

    Turning CD ROM into a stand alone CD Player

    Hello, everyone! I happend to pull a CDROM drive out of my old computer. Would hate to junk it. Anyone ever tried to make it play audio CDs as a stand alone CD player? Thank you. Max.
  6. maximka

    Power Equations

    if your 3-phase load is not ballanced and not grounded, you will need to know the impedances of each phase, and all 3 currents. if your load has a ground (3-phase, 4 -wire), sum up the currents and multiply by 415V. What is your load?
  7. maximka

    Hi, What is your explanation for

    The resistance of a conductor increases with the temperature rise due to higher athom vibration and other related internal kinetic processes, such as enthropy rise. The resistance of an insulator decreases because the energy of the electrons is increased with the temperature, and therefore it is...
  8. maximka

    electrons

    Electrons will only flow (in a steady state) if the circuit is closed. Earth is a conductor, and therefore, while "draining" electrones at one end of the circuit, it actually "returns" them at the other end. Number of free electrones in a wire will forever remain the same, i...
  9. maximka

    simple voltage switch

    Any transistor with appropriate voltage divider ( two resistors) at the base would help. But, if you are not comfortable with that, use a relay that operates at 240V. Let me know if i understood your problem correctly.
  10. maximka

    Transformers in parallel: What are the pitfalls?

    From my own experience: a little voltage imbalance will create large currents. You will have to match your voltage outputs. It is hard, but I managed to do that with two DC supplies using their own regulators.
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