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Recent content by alberr

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    Exam help! A loop-gain greater than one

    Let's take common equation of oscillator. It will be something like this: W(s)= k/(T^2*s^2 + 2*zeta*T*S + 1) where k - gain (close loop gain depend on it); T - time constant (have effect on poles configuration and phase margin); and, at last, 'zeta' - damping factor. Characterizes irreversible...
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    A question about Q factor

    Q-factor means quality of device. The more Q factor the less resistive loss will be.
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    Power dissipation values in TIP142 (Darlington Pair)

    Re: Power Dissipation This is maximum power dissipation when case of device gets cooled with some heatsink with good thermal contact to obtain case temperature 25°C. Device without heatsink. Air convection is not so good way of cooling. Temperature of case on this occasion will be more than...
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    How to view Chinese website in English?

    website translation translate.google.com
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    How do the generators of a power network get syncronized?

    This process occurs automatically and constantly. It's just a maintenance of some balance. Generators work in parallel mode. When rotor of some given generator get slower it starts working as an electric motor. Its frequency automatically increases. And vice versa. When some given generator...
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    Time Response of the Control system!

    If response is written as function of time then it is time-domain form. As a rule, it is combination of exponential and sine functions. Transfer function is function of s or p (different authors have different notations for it). As a rule, it is fraction.
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    advantages and disadvantages

    Advantages and disadvantages depend on particular field of application. There's no way to make DC amplifier with capacitive coupling ;) Advantage: possibility of independent DC offset for adjacent amp stages, when it needed. Disadvantages: more complicated schematic; limit of lower frequency...
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    Appliances impedances???

    It depends on your purposes. For what do you need to know the current? If you need to select diameter of wiring you don't need to measure actual current value. There's simplier way. Typical power consumption for any appliance is shown in its manual. It's not so hard to calculate the current...
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    ELECTROMAGNETIC WAVE IN VACCUME?

    Stars at night and sun in the daytime... And many other cases. prakash13 Recall scholl physics course. There were some answers for this question ;)

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