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Consumer Electronics
Ask questions here about the electronics you use every day: from phones and computers to kitchen appliances and radios.
4,952 Questions
Where was the first battery made?
Count Alessandro Giuseppe Antonio Anastasio Volta (February 18, 1745 - March 5, 1827)
see link
How does negative feedback work?
To remove the distortion ...
ANSWER: It does not reduce distortion but rather make the circuit stable. There can be distortion even with negative feedback by bad design in other word feedback does not reduce distortion.
An operational amplifier, which is often called an op-amp, is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output.[1] An op-amp produces an output voltage that is typically millions of times larger than the voltage difference between its input terminals.
Typically the op-amp's very large gain is controlled by negative feedback, which largely determines the magnitude of its output ("closed-loop") voltage gain in amplifier applications, or the transfer function required (in analog computers). Without negative feedback, and perhaps with positive feedback for regeneration, an op-amp essentially acts as a comparator. High input impedance at the input terminals (ideally infinite) and low output impedance at the output terminal(s) (ideally zero) are important typical characteristics.
Op-amps are among the most widely used electronic devices today, being used in a vast array of consumer, industrial, and scientific devices. Many standard IC op-amps cost only a few cents in moderate production volume; however some integrated or hybrid operational amplifiers with special performance specifications may cost over $100 US in small quantities. Op-amps sometimes come in the form of macroscopic components, (see photo) or as integrated circuit cells; patterns that can be reprinted several times on one chip as part of a more complex device.
The op-amp is one type of differential amplifier. Other types of differential amplifier include the fully differential amplifier (similar to the op-amp, but with two outputs), the instrumentation amplifier (usually built from three op-amps), the isolation amplifier (similar to the instrumentation amplifier, but which works fine with common-mode voltages that would destroy an ordinary op-amp), and negative feedback amplifier (usually built from one or more op-amps and a resistive feedback network).
It's a wavelength of light which is outside the visual spectrum.
In which type of wave does light travel?
All the electro-magnetic waves travel at the speed of light.
Electromagnetic spectrum includes the following:
* X-rays * Gamma rays * Ultraviolet rays * Infrared waves * Microwaves * Radio waves * Cosmic rays
What would happen if you had a stun gun in the UK?
Stun guns are available at many online shops.They are of different varieties and models.
Broadly, a "biometric device" is any device that measures a biological function or trait. As related to computers, biometric devices are used to control access and/or verify identity. Voice recognition, retinal scanners, palm/fingerprint scanners are all examples of biometric devices. A biometric scanner will take a picture (your fingerprint, your retina) and match it to a previous scan kept on file. Other types of biometric devices, such as voice recognition systems, will record your voice and compare the recording to a sample on file.
Compare and contrast series and parallel circuits?
In a series circuit, there is only one path for the current to flow through. In a parallel circuit, there are multiple paths for the current to flow through. For example, most old Christmas lights are series circuits. If one light in the whole strand of lights went out, then all the lights would go out. This is because once one resistance is out, the circuit is no longer complete, so the current can not flow. An example of a parallel circuit could be your household lighting. When you turn on your kitchen lights, your bathroom lights don't turn on with it, do they? That is because it is a parallel circuit. In a parallel circuit, there are multiple paths for the current. It doesn't matter if one light is on and another is off because the current can go through another way. In a series circuit as you increase resistance, the voltage and current decrease. In a parallel circuit, as you increase resistance, the voltage and current increase. Think of a series circuit as a one-lane road. The car would be the current, the gas in the car would the voltage, and the traffic lights would be the resistance. Since you are on a one-lane road, as you keep stopping at traffic lights, you aren't going very fast or far. Now, think of parallel circuits as a multi-lane road (or highway). The car is the current, the gas in the car is the voltage, and the traffic lights (or closed roads, or accidents, anything that would slow you down on the road) are the resistance. When you are driving and one road is closed, you don't have to stop because you can continue driving and go on a different road to reach your destination.
How do you adjust the time on relic watch?
Pull the adjustment dial, located on the right side, all the way out and twist it. Push it back in half way and you can adjust the date. Push it back in all the way so your date and time does not get messed up.
Where can you watch friends episodes on your ipod touch?
Yes, you can watch tv shows on iPad, but they are not free. You either have to:
- rent/buy movies on iTunes
- play a tv show on youtube
- or watch on hulu, but you can't get hulu on safari, you have to get the hulu application
How do you change batteries in an idog?
Here it is for you in 4 simple steps
1. There is a screw on the left hind leg below the stomach.
2. Use a Phillips screwdriver to remove the cover. (The screw stays in the cover, so you won't unscrew it completely.)
3. Take out the old batteries and put in 2 fresh AA's.
4. Replace the cover and re-tighten the screws.
And there you have it, your iDog will be back to it's normal self.
This is one of the smallest and simplest autonomous ones I have found yet, thanks to FriPilot http://members.tripod.com/robomaniac_2001/id120.htm Otherwise, if you prefer robot kits, some hobby stores sell a few inexpensive ones that are sometimes configurable, like these guys http://www.kitsusa.net/phpstore/html/Robot-Kits---Non-Soldering-1-1.html Or, some of the less expensive construction kits like Lego or K-NEX or Construx or a few others have motors and gears in the kits.
How many watts does a plasma tv used when it is turned off?
It obviously varies from TV to TV, but between 0.3 and 10 watts, with newer ones taking less.
What is the average speed of a freight train?
an average speed of 162 miles per hour and can go up to 186 miles per hour in commercial use
use CTRL + F -___-
Where can you download a pirate copy of Star Wars Episode III?
Hi,
Where can the F.B.I. reach you for illegally downloading videos? They'd really like to know.
Cubby
and getting pirated movies excetera is illegal
Why did bluetooth named 'bluetooth'?
Bluetooth was named after a late tenth century king, Harald Gormsson, viking king of Denmark and Norway. He was nicknamed "Blatand" which translates into Bluetooth. It was believed he had a tooth and gum disease which caused the discoloration of his teeth.
Additional Answer:
Bluetooth® is named for Tenth Century Danish king Harald Blåtand, known in English as Harold Bluetooth Gromson, who is reputed to have been so fond of blueberries that his teeth were stained blue.
And some more info:
It was named this as the king was most known for his unification of two warring tribes from Denmark and Norway. So, just as King Bluetooth connected these two previously warring tribes so does the Bluetooth technology with two electronic devices
Blue tooth were due to the blue colour of his crown he used to wear frequently.
The first walkman was released to the public in 1979, and was created by one: Nobutoshi Kihara, a worker for Sony. He originally created the walkman for his long and boring flights accross the Pacific.
When is the exact date of the invention of the radio?
because to know what is happening in the world.
Can you download games on psp 3000?
Yes, the PSP 3000 can connect to the PSN, to purchase and download games.
How do you program a puxing radio with a USB cable and software?
Download software from the Puxing website. A programming cable is needed and this can be bought from a number of places. I grabbed mine from 409shop.com.
http://www.pxdz.com/english/down.asp for the software
http://www.409shop.com/409shop_product.php?id=101679 for the cable.
D cell battery cause electric shock?
No, as D cell battery does not have enough power to shock you.
*edit
D Cell batteries don't have enough VOLTAGE to shock you.
They have plenty of power (Power = Voltage*Current) to shock you, but first you'd have to use a circuit to increase their voltage to thousands of volts. This would decrease their current proportionally and keep the power level the same.
Car batteries for example have tremendous amounts of power, but it's in the form of massive amounts of current (number of electrons flowing), the Voltage (intensity of the electrons) is only 12 Volts, which is still safe.
The voltage of an average stun gun can vary, but it typically ranges from around 50,000 to 1,000,000 volts. However, it's important to note that voltage alone doesn't determine the effectiveness of a stun gun. Other factors, such as current and duration of the electrical discharge, also play a role in its effectiveness.
What is meaning of cell phone error pps 6180?
This is an automated message from some cell phone providers such as AT&T, Cingular and several others that lets the caller know that the number they are trying to reach is either out of service range (in an area without coverage), disconnected, or temporarily unreachable for another reason.
If you're sure you're dialing the right number and you know the person hasn't changed their number, try calling back at a later time.
(Source): AT&T Wireless
Are laser pointers illegal in Western Australia?
As far as I can see there was a movement for them to be outlawed in Western Australia but I'm not sure if it was accepted and that they are now illegal. So If anyone can answer my question I'd be much abliged as I'm looking into buying one. Usually laser pointers with a power < 5mw is less dangerous for human eyes. And the laws in most countries don't forbid 5mw green laser pointers and 5mw red laser pointers. The laser pointers with IR filter is even better. You can choose beamq low power laser pointer.
