How can you get rid of unwanted leakage current to ground?
Make the device very small, so that the capacitance of the device is small
Where can you find circuit board illustrations of Mesa-Boogie amplifiers?
I would definitely check the Mesa/Boogie website, they generally have lots of stuff like that : )
Who invented the 555 timer chip?
Invented in 1970 by Hans R. Camenzind who was an electronics engineer from Switzerland, the 555 timer was first produced by Signetics in 1971.
What is the Schematic symbol for pressure sensor?
unfortunately i only know the HYDRAULIC symbol for pressure GAUGE. I hope that helps. Anyways, its basically a circle, with a line sticking out the bottom. Looks like a lolly-pop.
Inside the circle is an arrow, pointing either upwards to the right, or upwards to the left. But not straight up (confusing since this is similar to the symbol for hydraulic pump!)
There is a site called FESTO, which has a list of electrical, pneumatic and logic symbols.
hope this helps!
convert signal gains or losses to comparative decible reading.
Is an op-amp made of two transistors?
The op amp is an electronic device consisting of a complex arrangement of resistors, transistors, capacitors, and diodes. Here is a link to a 741 Op-Amp design...
http://www.play-hookey.com/analog/inside_741.html
What is difference between resonant and non-resonant antenna?
Every antenna is at resonance according to length to which it is cut ! They are usually cut to resonate at a particular band of frequencies, ie, Vhf Television band etc.
If no resonance then no signal is present and in such a case antenna is merely a random chunk of metal.
The magnetic field that an antenna puts out will produce an electric current on any conducting surface that it strikes, however if that surface has a characteristic length the induced current will be much stronger on the object. For example, when a Citizens Band signal travels through the air, it completes a cycle in approximately 36 feet. If the object that the magnetic wave strikes is 18 feet long (1/2 wave length), 9 feet long (1/4 wavelength) or 36 feet long (1 full wavelength), then the induced current will be much higher than if the signal struck a metal object that was not some appreciable fraction of the wavelength of the signal.
A resonant antenna is so much more efficient at converting (receiving or transmitting) current between the field and the antenna's feed-point than a non-resonant antenna that much effort is put into configuring resonance. A non-resonant antenna still works as an antenna but simply requires a more sensitive receiver or more powerful transmitter.
If you have ever heard people say they want to "tune" their antenna, they usually mean they mechanically change lengths in relation to the frequency / wavelength they are trying to match. It is also possible to change electrical properties to match frequency, which is more handy for matching multiple frequencies with a single antenna.
Connected in parallel with the system to reduce overcurrent/losses
An AC (non-polarized), usually high voltage capacitor that is connected in
parallel with an inductive Motor (and very close to the motor, or other
inductive load) to help reduce Reactive Power (Magnetizing AMPS)
which do no real work but only cause extra heat in the wiring and motor
as there is a Lagging Current Phase Angle created by an Inductor and a
Leading Current Phase Angle created by a capacitor which helps correct
the impedance mismatch between line and load.
Google "Reactive Power" and/or "ELI ICE man" for more information.
What does No-load voltage mean?
A no load voltage means the power level that is giving from the output pins power converter. This is when 0% load is given.
What are the functions of the resistor?
Resistance: Electrical resistance describes how an electrical conductor (a wire) opposes the flow of an electrical current (flow of electrons). To overcome this opposition a voltage (a energy) must dropped (used) across the conductor (wire). Resistance can be described by ohms law: Ohms Law: R = V / I (Resistance = Voltage / Current) (resistance measured in ohms) where: Voltage [V]= the energy lost across an component (voltage measured in volts). Current [I] = the charge (electrons) flowing through an component (current measured in Amps). Electrical resistance can be thought of as sticking your hand out a car window. The faster [current] you drive the harder the wind presses [resistance] against you hand and therefore it takes more energy [voltage] to hold your hand steady. When trying to overcome electrical resistance, the electrical energy lost is turned into heat. This is how the elements of a household stove, toaster, and fan heater work. Because of the vacuum in a light bulb, the electrical energy lost is instead turned into light. It can be seen the electrical resistance plays a large role in modern life. Resistor: The resistor is the most common electronic component and is used to limit and/or control the voltage and current in an electronic circuit. Resistors are carefully manufactured to provide a predetermined value of electrical resistance which may range from 0.1 ohms to 100,000,000 ohms, depending on the application. The physical size of a resistor also varies dependant on the amount of power passing through the resistor, given by: P = V x I (Power = Voltage x Current) (power measured in watts) There are also many types of resistors including: · Variable Resistor - changes resistance when its shaft is rotated (volume knob on a stereo). · Thermistor - changes resistance when the temperature changes (used in a thermostat). · Light Dependant Resistor (LDR) - changes resistance when the lighting changes (used in children's night-lights). Resistor Example: An LED is a small red light (such as the one on the front of most TVs) and requires 2.0 volts and 0.02 amps to operate correctly. If we connected that LED up directly to a 12 volt battery, the voltage would be too high, and too much current would flow… the LED would blow up. We need to use a resistor to limit the voltage and current. But which value of resistance should the have resistor? Uses ohms law: R = V / I = (12.0 - 2.0) / 0.02 = 500 ohms (Note: the voltage across the resistor is the battery voltage minus the voltage we want across the LED) But which value of power should the resistor be capable of handling? P = V x I = (12.0 - 2.0) / 0.02 = 0.2 Watts
What is common mode rejection ratio Explain briefly?
common mode rejection ratio is defined as ratio of differential voltage gain to common mode voltage gain
Common mode rejection ratio is the ability of the circuit to reject common entries like noise.
The only way is to contact the manufacturer or supplier with the model number at hand, normally it is the large number that is on the ID plate
The only way is to contact the manufacturer or supplier with the model number at hand, normally it is the large number that is on the ID plate
If a Self excited machine fails to excite what is the reason?
A break in the shunt circuit which is provided with excitation voltage from the armature circuit.
Excessively worn armature brushes.
This device must be started without any load attached.
Advantages and disadvantages of an ionization smoke detectors?
Cheap and effective when maintained properly.
Smoke detectors will run out of battery over time as they are not wired in to the houses electrical system.
Statistics show that far fewer people die in house fires when smoke alarms are present.
When the smoke alarms are placed to close to bathrooms steam may interfere with the detector, triggering false alarms.
Ionization detectors seem to respond better with high flames which could be a problem under certain circumstances.
What Is The Function of A L.E.D?
LED or light-emitting diode refers to a semiconductor material that emits light when electricity passes through it. It is used for visual signals, illumination and data communication.
This is an abbreviation for gigabaud; a giga prefix is equivalent to one thousand million and baud is measure using in information theory and datacomms and indicates symbols per second. So 1 gigabaud is one thousand million symbols per second.
Difference between class A classBclassABclassC amplifier?
Difference is in the work spot of voltage. Because of that, difference is in the graphics too. Also, angle(A)>180 , 90<angle(B)<180, angle(C)<90
How a lightning can affect a optical isolated RS 485 bus?
Because of the very high voltage of lightning, an opto isolator can't block it, the best is to relay any lightning to ground but that is still not a guarantee that the spike will be stopped. Lightning voltage is in the Giga Volt range.
What will be the power factor if the load is non linear?
Non-linear loads such as VFD drives and other rectifier power supplies usually cause a leading PF, similar to a capacitively reactive load. Many power supplies nowadays, like IT (computer) power supplies are PF corrected, BUT, when they are not loaded to full capacity they still cause a leading PF. Apparently the correction is only accurate at full load.
What is an uplink an downlink in mobile coommunication?
Uplink is from MS to BS
Downlink is from BS to MS
P.S: BS=Base Station, MS=Mobile Station e.g cell phone
When reliability is concerned then ICCP method is superior but when overhead cost incurred in installation and maintenance is concerned then sacrificing anode method is better than ICCP method. When reliability is concerned then ICCP method is superior but when overhead cost incurred in installation and maintenance is concerned then sacrificing anode method is better than ICCP method.
Why resistors are connected in series with the voltage source and in parallel with current source?
a voltage source has very less(negligible)resistance.thus is considered as a short.if connected in parallel to a resistor will draw all the current acting as a short.thus is always connected in series of a resistor.where as a current source has tremendous resistance(infinity).thus if connected in series will be conidered as an open branch and no current will flow through it other than the source current.