Electronics Engineering

A simple rectifier circuit uses a diode and there is a turn ON voltage for the diode. The input voltage has to exceed the turn ON voltage (0.6V for ordinary Si diode) before rectification is achieved.

A precision rectifier is an active circuit using an opamp and a diode in the feedback loop. This overcomes the turn-on "knee" voltage.

The op amp reduces the turn-on voltage of a diode in its feedback loop by a factor equal to the open-loop gain of the op amp. For practical op amp gains this reduces the forward voltage to a fraction of a mV, thus giving a "precision" or near ideal diode characteristic for the rectifier function.

I am going to assume that you mean low "resistance" in an open circuit test and are performing this with a multimeter. An ammeter works by place a very small amount of resistance in series with a circuit and then measuring the Voltage drop across the resistance. The Voltage is directly proportional to the current as given in ohms law: E = I x R If you are measuring the resistance through the ammeter it will have a very low resistance and impedance.

The question is invalid.

Volts is a unit of electrical potential in fundamental units of joules per coulomb. Watts is a unit of (electrical) power in fundamental units of joules per second. As such, you can not determine volts from watts without knowing something else, such as amperes (coulombs per second) or ohms.

The conversion of Amps to Watts is governed by the equation Watts = Amps x Volts. For example 1 amp * 110 volts = 110 watts

You have two unknowns for this equation, 1) the voltage which you want to find, and 2) the amperage. You must know the amperage to find your answer. In household current the voltage is 110-120. However, if you use a car battery, the voltage is 12.

You could have the amperage and then use the equation above.

4 amps: 500watts = 4amps X ? volts. 500 watts/4amps = 125volts (close to household current)

42 amps: 500watts = 42amps X ?? volts. 500watts/42amps = 11.9volts prox. (close to a car battery)

1 amp: 500watts = 1amp X ??? volts. 500watts/1amp = 500volts (about like a large electric eel--300 to 800 volts)

A diode characteristic curve is a curve that describes the characteristic of diode and it is normally based on experiment data.

The curve itself has two distinctly separate parts.One part lies in the first quadrant and it stands for the forward-biased situtation.It reflets the barrier voltage(meaning the smallest amount of voltage that can turn on the diode).For Germannium diode,the barrier voltage is 0.3V while silicon diode is 0.7V,but the real value differs according to the temperature and current flows through the diode.The other part lies in the third quadrant which indicates the reverse-biased situation,from which you can find out the leakage current(the current flow through before Breakdown Point).

Typcially, a diode characteristic curve varies from diode to diode.But theoretically speaking,we regard them as the same.

Work in reverse bias.(breakdown at a particular voltage to keep the volt. constant so used as voltage regulator)

same as diode when forward biased.

The capacitor helps to keep the quiesent point fixed. During its operation it bypasses the ac component. If the ac also flows through this emitter link then as we know by parameter equations emitter current and ce voltage changes hence varying q point.

i dont knw the answer thats why m asking from u stupid people

The influence of a coil of wire upon an alternating current passing through it, tending to choke or diminish the current, or the similar influence of a condenser; inductive resistance. Reactance is measured in ohms. The reactance of a circuit is equal to the component of the impressed electro-motive force at right angles to the current divided by the current, that is, the component of the impedance due to the self-inductance or capacity of the circuit.

interrupts in 8085 are basically classified into two types:

1.Maskable

2.Non maskable

maskable interrupts are those which can be delayed.This is done by masking off the interrupts which are not required.

Maskable interrupts are:RST 7.5,RST 6.5,RST 5.5 and INTR

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The 555 is a timer and oscillator chip capable of sourcing and sinking 200 milliamperes, and is useful for pulsing an infrared LED to power an infrared transmitter. It can be pulse width modulated or otherwise controlled via the various control pins.

See: http://talkingelectronics.com/FreeProjects/555/555-P3.html

in most cases the IR detector used is TSOP sensors which works only on a specified frequency of 38KHz. So by using 555 timer, we can design the circuit very easly to work @ 38KHz. dats why in 555 is used in many IR txns.

Most true RMS voltmeters can measure the value of a ripple voltage on top of a DC supply, when you place it in AC mode. You can also place a small capacitor in series with a DC voltmeter and that would measure the ripple. The real way to do this, because ripple voltage is not sinusoidal, is to use an oscilloscope, particularly if you want the peak values.

Advantage - 1. Phase modulation & demodulation is easy compared to Frequency modulation. 2. Phase modulator is used in determining velocity of moving target by extracting Doppler information. Doppler information needs stable carrier which is possible in phase modulation but not in frequency modulation. Disadvantage - 1. Phase ambiguity comes if we exceed its modulation index pi radian(180 degree). 2. we need frequency multiplier to increase phase modulation index.

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Apex- 12 ((:

A: A zener diode is manufacture to reverse breakdown at a certain voltage this voltage will remain almost constant no matter how much more voltage is available [within operating parameters]. this zener must be able to sustain both itself operating currents plus the load

http://wiki.answers.com/Q/What_is_an_analog_and_digital_control_system"

A current cannot exist without voltage but voltage can exist without current.Simple example is battery. A battery has votlage even though it is not connected elsewhere.

The electret microphone is based on the electret capacitor, which is a special capacitor with quasi-permanent charge. Vibrations in the air are picked up by the capacitor, which generates an equivalent vibrating electrical signal. Unlike a traditional condensor (another name for capacitor) microphone, the electret does not require a power source.

A food processor is a multifunctional kitchen appliance that is designed to quickly and easily perform repetitive food preparation tasks like chopping, slicing, shredding, grinding, and pureeing. A food processor can be used to prepare almost any type of food. Importantly, a food processor can be a valuable time saving resource for any cook and eliminate stress that would otherwise be put on hands, wrists and forearms from repetitive cutting tasks.

the disadvantages are;

· They're usually really noisy

· They're hard to clean

· They might over cut, blend, chop, grate, need

· You don't have much control

· If you forget the lid to the tube it could go everywhere

· They are very dangerous to clean because of the sharp blades

It means do you want a mansion a jacuzzi to watch your movie the goonie loonies then we start bubling then what you doing next week ohh ohhh im the olny one you need now oh now just a mofuking kids oghh

The application is simple a flip for every input change

The LM741 series are general purpose operational amplifiers which feature improved performance over industry standards like the LM709. They are direct, plug-in replacements for the 709C, LM201, MC1439 and 748 in most applications. The amplifiers offer many features which make their application nearly foolproof: overload protection on the input and output, no latch-up when the common mode range is exceeded, as well as freedom from oscillations. The LM741C is identical to the LM741/LM741A except that the LM741C has their performance guaranteed over a 0°C to +70°C temperature range, instead of -55°C to +125°C.

there are different types of proximity sensors namely inductive capacitance and infrared. the working principle of inductive proximity sensor is,

it consists coil, oscillator, detector and trigger circuit. when current flows through a coil magnetic field will be generated and when the metal get contact with that field

the voltage is induced in the metal the detector detects this loss in voltage and triggering circuit will give the contact output...

praveen achalkar

MCF mangalore