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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
What is alternative of semiconductor?
- as a material, nothing
- as a device to perform the function, vacuum tubes or magnetic amplifiers
What is the acceptable voltage higher than 480v for a 480v inverter?
The voltage range should be marked on the case but without that information a 5% increase can be assumed, so 504 v.
Which logic gate is a basic comparator?
Either XOR or XNOR can be used, but the output will be inverted on the XNOR.
How many transistors colossus?
The Colossus computers built by the British in WW2 to break German teletype cyphers were built with vacuum tubes as transistors did not exist at the time.
- Colossus Mark 1 contained about 1400 tubes, with 1 processing unit it analyzed messages at a rate of 5000 characters per second, only the one prototype machine was built
- Colossus Mark 2 contained about 2400 tubes, with 5 processing units running in parallel it analyzed messages at a rate of 25000 characters per second, 10 machines were built
A typical run of a message on Colossus Mark 2 took about 15 minutes to crack the key for the last 2 bits, another 15 minutes to crack the key for the first 2 bits knowing the key for the last 2, another 15 minutes to crack the key for the remaining middle bit knowing the key for the other 4 bits. Including setup times this was probably just over an hour per message. The message and this key were put on another machine to partially decrypt the message. The partially decrypted message was then analyzed by another group by hand to get the remaining part of the key. After this was finished, the message and both parts of the key were put on another machine, which printed out the fully decrypted german message... which then had to be translated, etc.
Is pic16f877a microcontroller a 16bit microcontroller?
No, pic16f877A is powered by a 8 bits pic core. the 877A is an upgrade for the 877 version. same for the sister microcontroller pic16f876A and pic16f876.
I ve been fan of this microcontroller for years. It is powerful and you can do a lot of thing with it.
You can you can have it from www tmartis com together with many other stuff that you can purchase together. I always do my purchases from there.
Have fun
What do you mean the 1st order and 2nd order filter circuit?
1st order that has in low pass filter one resistor and a capacitor in parellal to ground .And the 2nd order filter has one pole as a above and second as resistor in series and capacitor for gain and the refers to the number of components (C,L).
How do you make an impedance- and level-matching transformer?
You'll need to decide *which* one you want.
An impedance-matching transformer has a defined primary-to-secondary turns ratio.
This *may* give the level match that you want, it may not.
Alternately, you can design for a level match, which also *may* give the impedance ratio you want, it may not. It also has a defined turns ratio, but this may not meet an impedance-matching requirement.
For impedance matching find the ratio of impedances, take its square root, and use that as the turns ratio:
2400 ohms to 600 ohms has an impedance ratio of 4:1, so its turns ratio will be (sqrt4) = 2:1.
To level-shift 1.23 volts (+4 dB) to 300 mV (-10 dB), the ratio is (1.23/0.3) approx 4:1.
From the above, you could match 2400 ohms to 600 ohms, but *not* +4 dB to -10 dB with the one transformer.
Where can someone buy VOX amplifiers?
Vox amplifiers can be purchased at a variety of locations both online and in local stores. Music Arts, Musicians Friend, and Amazon offer Vox amplifiers for purchase online. Guitar Center is also a well-known musical gear store than offers these amplifier online or in-store for your convenience.
What is the super famous national semiconductor?
The famous national semiconductor was a manufacturer of semiconductors, with a specialty in analog devices and their subsystems. In 2011, the company became part of Texas Instruments.
What TV shows are shown on G4 TV?
Some of the television shows on G4 TV include: Bomb Patrol Afghanistan, Campus PD, The 100 Video Games of All Time, X-Play, Cops, Heroes, Knight Rider, and Quantum Leap.
What can a communication degree be used for?
There are many career paths one may take after receiving a degree in communications. These include Broadcasting Station Manager, Advertising Sales Coordinator, Actor, Comedy Writer, Sports Caster or a Talk Show Host.
Why resistance of germanium increases on decreasing temperature from room temperature to 80 Kelvin?
loss of free current carriers as temperature drops.
Can an OR gate have one input?
Technically, an OR gate could function with only one input, in which case it would perform the same as if it was not present; when its only input goes high, it would go high, and when the input goes low, it would go low. As a practical matter, the only useful purpose of a single input OR gate would be to have it act as a simple diode, which would be more efficient to simply have a diode in its place.
Is it essential to use a baby stair gate?
No it is not essential to use a baby stair gate. If the baby is located at a home without stairs, there would be absolutely no need for one. On the other hand, if the location has any stairs, or even rooms that a parent does not want the baby near, a gate is imperative.
How does the intelligence signal modulates the carrier?
There are three major types of modulation:
AM, Amplitude Modulation, where the modulation signal is altering the amplitude of the carrier according to its own amplitude, normally this is done in the output stage. Therefor a strong audio signal is necessary at the same or a little less than the power of the carrier, never higher, because that will over modulate the carrier that will resort in distortion of the receiver output. AM is used in the lower band of the RF spectrum.
FM, Frequency Modulation, where the frequency of the carrier is altered by the audio signal. When the amplitude of the audio is going higher the frequency go lower. Modulation happen at the oscillator stage, therefor a small audio signal is used to modulate the frequency. FM is normally used in the higher frequency range of the RF spectrum, 50MHz and up.
FSK, Frequency-shift keying, used for data transmission, this type of modulation is simply, switching the carrier on and of, a high bit will switch the oscillator on and a low bit will switch it off, in some designs a low will be on and a high off.
How can you use an analog telephone signal to activate a digital relay?
There are many different ways this could be done depending on the purpose and exactly which analog telephone signal is to be used.
- ring signal, this is a 120VAC 5Hz pulsed signal present between tip & ring when the phone is on hook and being called; a high voltage insulated optocoupler must be used to trigger a oneshot or flipflop that will control a relay driver to operate the relay
- on/off hook switching, when on hook 48VDC is present between tip & ring, when off hook this voltage drops below about 10VDC; these states are probably best sensed using a level detector on a floating power supply (to protect against damage by the ring signal) and a high voltage insulated optocoupler must be used to control a relay driver to operate the relay
- AF tone signal, this is a signal somewhere between 50Hz and 3KHz; a 600 ohm to 600 ohm transformer should be used to block the ring signal and DC on/off hook voltages, this transformer should drive an amplifier (and maybe a clipper) the output of which goes to one or more phase locked loops set to specific frequencies, the phase locked loop outputs each control separate relay drivers to operate the relays
Note: these are not the only way to accomplish this, in fact commercial off the shelf phone interface modules are available that will handle the ring and hook signals for you (maybe even including the relay drivers or even actual relays) and provide the AF signal ready to feed to the phase locked loops. Such modules may actually be the best way to start if you don't want to run the risk of a mistake that might cause the phone company to disconnect service for a detected fault that could damage their equipment.
What should be the value of capacitor at transistor amplifier circuit input?
at full input, if the transistor is working, the value of capacitor will be 0.
When resistors are connected in series then what happens to the watt?
Resistors are rated in wattage so the lowest wattage rating will be the wattage of the series circuit. It will be able to handle that power any more and the lowest wattage resistor could be damaged and fail.
Another Answer
When two or more resistors are connected in series, the resistor with the lowest resistance will operate at the highest power. If the power developed by a resistor exceeds its rated power, then the resistor may burn out.
Which laptop is use for PLC programming?
Almost any PC can be used for programming almost any PLC system
The programming interface will be either a serial port, a USB port of increasingly, an Ethernet port.
The PC will usually require the appropriate development software that is supplied, in most cases, byt eh PLC manufacturer.
How schmitt trigger and square wave generator differ in their output waveform?
Yes,schmitt trigger has upper and lower threshold voltage for the reason of noise protection while square wave generator doesn't have these properties.
How the size of transistor reduced to place in a single pocessor?
transistor size depends on its channel length, that is the length of the region in which a transistor act as an electron tube.
the shorter the region, the lowest the resistance, the fastest the transistor, etc...
so, it is always good to scale transistor size.
problem is that you have to apply a 'good' electrical field in the channel, in order to drive a good 'ON' or 'OFF' state for your transistor. that's why it's not easy to scale their size.
What are difference instrument system block diagram and instrument cable block diagram?
system block diagram means we have use to only a type of ammeter ,voltmeter ,some cro so,but cable block diagram mean ,we use some,co-axial cable,normal cable,and etc
