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  1. Closed: Re: High voltage issue in my MP3 player - help needed

    I cannot see the attachment. Please attach a valid file.
  2. 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.
  3. 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...
  4. 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...
  5. 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.
    ...
  6. 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...
  7. [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?...
  8. [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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    Closed: Re: Clarification on RMS value

    The correct statement will be over a complete period; not over half-cycles.
  19. Closed: Re: Basic 12v Battery VOLTAGE METER, more resolution needed

    There is one example in the application notes that can be used to set the lower point (the voltage needed to light up the first LED) and also the steps for the next LED.
  20. Closed: Re: Basic 12v Battery VOLTAGE METER, more resolution needed

    No, it won't work; because the driver for the display takes the power from the same battery and the ground is common.

    You need to have an offset (say 10V) and then apply the voltage to the input....
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    Closed: Re: How many devices can we have on SPI?

    I should have checked before posting. Thanks anyway
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    Closed: Re: How many devices can we have on SPI?

    I was under the impression that the number is 255 (256 with zero excluded).
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    PCB layout is an art and some consider it as a black art!

    Simple advice that may work sometimes: group blockwise and keep related blocks close.
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    Closed: Re: Two Qs re: resistance

    Each resistor has two ends. It is a symmetrical device in the sense that you can exchange the two ends without ANY effect.

    Let us label the two ends of resistor R1 as E1 and E2. Same way label the...
  25. Closed: Re: Rectifier diodes with bypass capīs & gounding speaker basketīs

    Carbon has basically two allotropes: graphite and diamond. Of these only graphite is conducting.

    Ignore some of the nano forms of carbon- nanotubes, fullerenes etc etc.

    Carbon dioxide is a gas...
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