0
Consumer Electronics
Ask questions here about the electronics you use every day: from phones and computers to kitchen appliances and radios.
4,952 Questions
How do you install ink refill to a bic e3 pen?
# Buy refill at Staples: SKU#718103030823 (3/99 cents)
# Unscrew barrel anti-clockwise
# pull out old ink tube
# cut new refill to same length as old one (cut 3/8 inch off rear)
# push refill into barrel
# re-install front of pen tightly
# You just saved $10.00 or so. Happy writing.
Is it possible to make any logic gate from only use of NOT gate?
NAND and NOR logic gates are the two pillars of logic, in that all other types of Boolean logic gates (i.e., AND, OR, NOT, XOR, XNOR) can be created from a suitable network of just NAND or just NOR gate(s). They can be built from relays or transistors, or any other technology that can create an inverter and a two-input AND or OR gate.
Hence the NAND and NOR gates are called the universal gates, and this basic understanding should be observed by all undergraduate electrical engineering students.
But, for reasons of indulgence on the topic, lets go into a further explanation, of why NOT gates cannot be used. Take for example the NAND gate. Lets build its truth table.[1]
A0A1 | B
--------
00 | 1
01 | 1
10 | 1
11 | 0
States (00), and (11), can be implemented using a 2-input NOT gate.
A0..A1 =|>- B
Complications arise, however with building a solution for states (01), and (10). The following is not a viable solution
A0 ---|>-----|>--- B (Not viable)
The problem has to do with the limited memory of the system:
Imagine two signal paths, running in parallel, to a mutual destination
Branch 1 - ..---|>-----|>---..
Branch 2 - ..---|>----------..
If each inverter ( NOT gate ) has to manipulate ( invert ) the signal, then a gate delay Dgate is introduced by each gate. Thus the 1st branch will have a gate delay of 2; whereas the 2nd branch only has a gate delay of 1.
The faster branch ( Branch 2 ) will usually reach its destination first, which inherently introduces timingissues.
This can happen with other forms of TTL, such with NAND gates. But the solution is to introduce a latch. A latch is essentially a 1-bit memory cell. [1]
Branch 1 - ..---|>-----|>--..
Branch 2 - ..---|>-----(L)--..
..But then how do you build a latch, if a latch is composed of TTL NAND gates [2], and the initial timing issues, involving these gates, hasn't been resolved?
And it is this contradiction which thus preempts the use of a NOT gate as the foundation for a homeomorphic system.
There has been a proposed solution, in which a solid-state capacitor is substituted in place of a latch ( I leave it up to the reader to decide for himself ), it appears to be proprietary technology in Iran. If you have $31.50, you can read their paper.[3]
REFERENCES
[1] - See related links ( on bottom of this page )
[2] - See related links
[3] - See related links
If a person is fired without being talked to about his problem can he be legally fired?
It may depend on the state the individual works in. If the employee works in an "at will" state, then "yes" a person may be fired even if they were not warned. This is because an "at-will" employees' employment "may be terminated with or without notice and with or without cause by either the employer or the employee at any time."
Some states are "just cause" and in this case, the employer would have to show that there was a legitimate reason for firing the individual.
However, even in "at-will" states the employee may be able to legally fight a termination of employment IF they were fired for a reason protected under law. For example, if the person has a disability or is believed [known] to have a disability and the employer fires them because of their disability, the Americans with Disability Act [ADA] may come into play. If the individual is fired because "they're too old," then ADEA [Age Discrimination in Employment Act] may come into play.
If an employee believes they have been fired for one of these reasons or for being in a protected class, then they should contact their state office on employment laws AND the federal government which covers the area the person feels they have been discriminated. A good start would be the Department of Labor and EEOC.
Impact of ecosystem destruction?
impact of ecosystem has caused a great imbalance in nature which later leads to loss of biodiversity
How do I reactivate my home brinks security panel?
it is according to what model number u have... and what you plan on doing once you get into programming mode... do you want to set it up for monitoring? or just want a loud noise to scare off intruders most security panels made by HONEYWELL/ADEMCO for brinks can be reprogrammed easily. disconnect the battery then the ac plug-in transformer... wait a few seconds then plug in just the ac transformer... within 30 seconds push the #and* on the keypad at the same time and hold them for about ten seconds the display should flash a d1 or a programming prompt whattheydontwantu2no
Schematic diagram of quadrilateral with definition?
A quadrilateral is a plane figure bounded with four sides and consisting of four angles.
Where is the USB port for the LG rumor?
The USB port on the LG Rumor is the same port at the bottom of the phone used to charge the phone. A special USB data cable must be purchased to connect to the phone.
Who invented the desoldering iron?
Anthony Zammit one of the directors of Phillips in Malta. He noticed that workers were taking too long an too many resources to remove solder from components using copper film and that the desoldering pump was too large and cumbersome. So he came up with the design of a small pump attached to a soldering iron which had a tiny hole drilled at the tip and turned the whole thing into a gun and called it the desoldering iron. Phillips never recognized him as the inventor and was compensated with a golden pen for his effort.
Should you wire a pool pump to 110 or 220 volts?
The most important thing for safety is to wire the pump to the correct voltage marked on the pump.
All else being equal (i.e. the cost of the pump), use 220 -- the higher the voltage the less electricity lost to resistance and heat.
ANS 2 Most modern pool or spa pumps are convertible (at the motor connection) Connecting to 220 is definitely more efficient.
Ans 3: 110 v is safer, with a lower risk of shock. For a pump of 1 HP or less the power lost in the wiring is very small if the right wire is used.
What is a single force that has the combined effect of all the forces acting on an object called?
Resultant
Where might one purchase a green laser 5mW?
There are many different sites and stores that sells a 5mW green laser. One site that can be trusted and sells green lasers is Amazon and it is easy to order from this site.
Yes. I have an iPhone 3GS, and when I got a carbon fiber case for it, I lost three bars of signal.
Can you lay a computer tower on it's side?
yes you can with some, but make sure the fan ventilation are not on the side that is on the desk
How do you change your profile picture on Facebook using your iPod Touch?
Upload your photo to Facebook. Go to the zoomed in version of your photo. Once you have that, click the photo. Options will come up and one will say put as profile pic. Obviously click it and then when it all loads you have your new picture.
How do you create a new photo album on your iTouch?
You have to do it via Itunes first. Open Itunes, create a new folder in your pictures file, and select and copy all the pictures you want to have in that new album. Then sync your ipod touch to Itunes.
What do you get if you burn petrol?
The burning of petrol (also known as gasoline) is a combustion reaction. Ideally gasoline and O2 + an ignition source yield carbon monoxide (CO2) and water (H2O). In actuality emissions also include the byproducts of carbon monoxide (CO) and nitrogen oxides (NOx).
Where is the ferry ss in pokemon sapphire?
in the shipyard it was being built
you get the ticket after the elite four defeat
One joule (energy unit) per coloumb (predefined charge 6.24X10^18 electrons).
V = J/C
4 What is the difference between a transformer and a rectifier Which are found in a PC power supply?
A rectifier is a device that converts alternating current to direct current. A transformer is a device that changes the ratio fo current to voltage. A rectifier is found in a PC power supply.
