Search:

Type: Posts; User: c_mitra

Page 1 of 20 1 2 3 4

Search: Search took 0.03 seconds.

  1. Replies
    6
    Views
    193

    Closed: Re: water flow detection in a pipe

    It helps if you follow all the units in the same system; 6 in dia pipe; o pressure diff corresponds to zero flow but max pressure diff 32 bars corresponds to a flow of 20 GPM. These numbers do not...
  2. Closed: Re: how to select capacitor for ruhmkorff coil?

    It does not eliminate arcing across the switch contacts; but it reduces.

    Think in terms of the total energy: when the current collapses, a part of the energy may be stored into the capacitor (a...
  3. Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

    The experiment (in the above video) has not been done (planned) properly. All experimental design has one focus: prove an hypothesis. The outcome of the experiment may be pass or fail.

    In my...
  4. Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

    I am trying to say the same thing; the culprit is the rapid movement of large amounts of charge under significant potential gradient. The associated energy kills the chip.
  5. Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

    I do not get it; can you please elaborate?

    I presume that by static shielding you mean a surface that blocks electric field (any conducting surface will do). However, if the electrical...
  6. Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

    It is really interesting; I saw the link you gave and it does detect movement of charges (that is a current) but not a stationary charge.

    It is not the static charge that is the culprit: the...
  7. Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

    That may not work well.

    They are electrically conducting but the conductivity is not much. That is a feature so that discharge current stays low with a reasonable time constant (0.1 to 2 sec or...
  8. Replies
    14
    Views
    5,614

    Closed: Re: Choose a proper magnetic field sensor

    You can call them geomagnetic sensors but they are mostly a variant of metal detectors. They are well proven and tested designs.
  9. Closed: Re: High voltage issue in my MP3 player - help needed

    I cannot see the attachment. Please attach a valid file.
  10. Closed: Re: how to measure the current consumption by dc motor

    I am surprised. Most DMMs use a current shunt of a low value.

    Just for fun, try this experiment; use a 1 Ohm resistor in place of the DMM and measure the voltage across the resistor.
  11. Closed: Re: Automatic Water Level Controller - Dynamic Dry-Run and OverLoad Current Calc Rela

    Sounds a good strategy. But...

    If you see a trend (current slowly increasing or decreasing over a long period), perhaps the motor is getting overheated or due to retire...

    If you see a...
  12. Closed: Re: How the washing machine Automatic Load Sense works?

    Then how does it overcome "This in addition to the drum's high inertial load that will obscure the inertia of the wash load."- the problem stays.

    - - - Updated - - -



    My washing machine is...
  13. Closed: Re: Automatic Water Level Controller - Dynamic Dry-Run and OverLoad Current Calc Rela

    Looks OK.

    For dry run (pump running without pumping anything), the actual current will depend on the type of motor. For simple capacitor start induction motors, 20% will be a conservative value.
    ...
  14. Closed: Re: How to brake a three phase brushless DC motor?

    This is expected.

    Plugging is considered an emergency method to stop the motor; first you disconnect the power (so that the motor runs on its own inertia) and then it acts like a generator. At...
  15. [SOLVED]Closed: Re: Inflatable Hard Drive - transferal of data between three devices via USB

    It may be wise to think in advance how you are going to connect it. The SATA hard disk can be connected to a PC and the arduino can be connected to the PC. Where you are going to connect the USB hub?...
  16. [SOLVED]Closed: Re: Inflatable Hard Drive - transferal of data between three devices via USB

    Computer is connected to the hard disk via the USB cable; the filesystem reports the amount of hard disk used.

    How this information comes to the arduino? You need to have a connection to the...
  17. Replies
    16
    Views
    1,748

    Closed: Re: Light distribution from multi LED lamp?

    I understand.

    You are planning to use the LEDs at a low height. In this case, the peripheral rays can reach the ground and you want to divert some of the central rays to the edges. But most of the...
  18. Replies
    16
    Views
    1,748

    Closed: Re: Light distribution from multi LED lamp?

    Why use a lens at all?

    15cm X15cm heatsink for 10 COB LED with 300W power input may be difficult to focus on a wide area - best may be to skip the lens altogether. Unless the light source is...
  19. Replies
    22
    Views
    2,915

    Closed: Re: Current increase electrolytic cell

    Although the anion has less important roles, sulphate is not the optimal anion in this experiment. You should use Cl- as the preferred anion in your experiment: just add sufficient NaCl in the...
  20. Replies
    16
    Views
    1,748

    Closed: Re: Light distribution from multi LED lamp?

    The situation will be different if you want a small spot or a wide area of illumination - these are different requirements.

    For practical purposes, you can consider each COB as a point source; A...
  21. Replies
    16
    Views
    1,748

    Closed: Re: Light distribution from multi LED lamp?

    300W is not really much; I presume that 300W reflects the input power.

    Just as a rough approximation, say about 50% of this input is converted into light. The rest will be converted into...
  22. Replies
    8
    Views
    1,131

    Closed: Re: Clarification on power consumption

    Refer to the circuit diagram shown in #6.

    The two negative ends of the voltage source are connected to ground; they are at zero potential.

    Potential at V1 is +10 and the potential at V2 is +5V...
  23. Replies
    16
    Views
    1,748

    Closed: Re: Light distribution from multi LED lamp?

    If you want any specific distribution of light, you need to use individual lenses. It may not be possible to use a single lens to focus on a desired distribution. For example, to get an uniform...
  24. Replies
    22
    Views
    2,915

    Closed: Re: Current increase electrolytic cell

    I suggest a read of the semi-popular article: https://en.wikipedia.org/wiki/Aluminium%E2%80%93air_battery

    It has the potential of better energy density and efficiency compared to Li batteries but...
  25. Replies
    22
    Views
    2,915

    Closed: Re: Current increase electrolytic cell

    It is not possible to use Al and C electrodes to make a rechargeable cell using water as an electrolyte. You need to use non-aquous electrolyte for recharging to be effective.

    When you are...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4