Define Amplifiers, what are they used for and what are the different types of amplifiers?
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As the name siginifies it Amplify the signals (usually electronic). An amplifier can be considered to be any device that uses a small amount of energy to control a source of a larger amount of energy, although the term today usually refers to an electronic amplifier. The relationship of the input to the output of an amplifier — usually expressed as a function of the input frequency — is called the transfer function of the amplifier, and the magnitude of the transfer function is termed the gain.\n\nGain = f (Input)\n\nThe diffrent type of the amplifiers:\n# 1 Electronic amplifiers\n\n    * 2.1 Power amplifier classes\n          o 2.1.1 Class A\n          o 2.1.2 Class B\n          o 2.1.3 Class AB\n          o 2.1.4 Class C\n          o 2.1.5 Class D\n          o 2.1.6 Other classes\n    * 2.2 Vacuum tube (valve) amplifiers\n    * 2.3 Transistor amplifiers\n    * 2.4 Operational amplifiers (op-amps)\n    * 2.5 Video amplifiers\n          o 2.5.1 Oscilloscope vertical amplifiers\n          o 2.5.2 Distributed amplifiers\n    * 2.6 Microwave amplifiers\n          o 2.6.1 Travelling wave tube (TWT) amplifiers\n\n# 3 Musical instrument amplifiers\n\n    * 3.1 Audio amplifier\n\n# 4 Other amplifier types\n\n    * 4.1 Carbon microphone\n    * 4.2 Magnetic amplifier\n    * 4.3 Optical amplifiers
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The op-amp is basically a differential amplifier having a large voltage gain, very high input impedance and low output impedance. The op-amp has a "inverting" or (-) input and "noninverting" or (+) input and a single output. The op-amp is usually powered by a dual polarity power supply in the range of +/- 5 volts to +/- 15 volts.\n\nOne of the most common applications of this device is the propagation of sound, like a line driver for your stereo. The signal from an external source is very low-powered ... the operational amplifier is used to boost the signal to where it can "drive" the speaker to reproduce the sound.\n\nAnywhere a signal needs to be boosted - and distortion minimized - you can find an op-amp configuration of some sort.
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Build an amplifier starting with transistors.
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depends on the amp, if the amplification has 2 outs it's stereo if there's no amplification whatsoever then is LIVE, but to some sound engineers purists there's not a category like live so they call it mono.
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technically - no. But if you want a good sound - yes. Guitar amps are designed with full range speakers. Bass amps are designed with low range speakers or woofers. Some effects pedals are designed for bass guitars also.
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To give an example, a transformer could be a voltage amplifier, but the power would remain constant.  A power amplifier may or may not change the voltage, but increases the amount of overall power.  As you can imagine, the input and output impedances must be properly matched for all these examples.
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Each of these  transistors have their own unique uses. They are chosen for use according to the best operating characteristics of a particular circuit, not by random preference.
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Springs inside guitar amps are used for a reverb effect.  If you pick up the amp an inch or so and drop it back to the ground (with the amp on), you'll hear a crazy loud spring-reverb sound.  Many newer amps use electronics instead of the mechanical "spring" reverb.
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The voltage, current and resistance are related by the equation, “Change in voltage = Change in current x Change in resistance.” \nIf we have a device which changes the resistance without allowing a change in current then change in voltage is directly proportional to the change in resistance. Transistor is such a device. \nIn an amplifier one gets an amplified output signal for a small input signal. Transistor is used in amplifier. It transforms the output resistance so as to keep the output current nearly equal to the input current. That is why it is called transistor. (Transforms resistor)\nWhen a weak pulse is applied across the input of an amplifier having a transistor, there is a small change in the input current, voltage and resistance. But the transistor increases the resistance in the output, but keeps the output current same as the input current.\nCurrent being the same, we get an amplified voltage.
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voltage gain is just that.  volts out divided by volts in should give a voltage amplification factor or voltage gain.\n\nsaturation typically means the device is conducting all it can.  any more increase in input results in no more increase in output.  the stage is saturated.
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Gain is the amount the amplifier increases the amplitude of the signal. Volume is how mouch the signal is attenuated at the output side of the amplifier. They really do the same thing, however it is simpler circuit wise to use an attenuating circuit on the output side of the amplifier than to use a variable gain amplifier. Most amplifiers are designed to provide a fixed gain that is only adjusted by an AGC (Automatic Gain Control) to prevent over driving the amp and the resultant "clipping" of the signal.
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the general order is: amp> delay/reverb> chorus/flanger>eqs> distortion/overdrive> compresser/sustainer> wah> guitar.
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Very simple circuit, the two power supplies are used to maintain an electric equilibrium.\nThe potentiometer is used to adjust the sensibility.\nThe transistor amplifies the signal when the person lies, he or she reduces her or his resistance, and the transistor amplifies the signal, the meter instrument shows the result.
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GUITARS\nfender(real kind)\ngibson\nPRS\nMartin\nbreedlove\n\nDRUMS\npearl\ndw\nyamaha
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here is my opinion, and i will explain why...\n\nQuality Electric Guitar + All Tube Amp = Warm, Fat, Awesome Tone!\n\nExample: Gibson Les Paul + Marshall DSL100 (or TSL) = Orgasm\n\nExample: Gibson Voodoo V + Marshall JCM800 (2203) = GOD\nExample: Fender Stratocaster + Fender 68 Vibrolux = Stardom\n\nThere are basically two different types of guitar amplifiers, Tube and Solid State (or transistor).\n\nTube amplifiers use a series of old fashioned tubes to provide power, distortion, and tone. Solid State amplifiers rely on transistors, and sometimes software, to provide the tone. They both have the same job, to amplify the sound of your guitar, however they both sound totally different, with good points and bad.\n\nhere i will guide you through exploring The advantages of a Solid State Amplifier.\n\nThey usually have fabulous clean sounds, crisp and accurate almost to a fault.\nThey are quick and responsive to your playing.\nThey can take more abuse in moving since there are very few fragile parts.\nThey require less maintenance.\nThey can “Try” and emulate other amplifiers at the push of a button.\n\non the other hand here are the disadvantages:\n\nNO WARMTH – solid state sounds cold and sterile.\nLOUSY DISTORTION - to the point that it fatigues your ears and can cause your spine to shatter at high volumes. I have actually talked with people who have no idea about music gear describe the sound of a quality Fender solid state amp that was trying to “rock”, as sounding “Harsh, like a razorblade through my ears”.\nNO TONE – Solid State amps all sound very similar and will sound the same with almost any player.\nTHIN – They usually sound very thin as soon as you leave the clean spectrum. Distortion only makes solid state amps sound even more thin and lifeless. Like a mosquito in a jar.\n\nmoving on to tubes, here are the advantages:\n\nWARMTH – Tube amps are best known for their exceptional warmth. They are pleasing to the ear, something you can not justify in a laboratory. Scientists have no way of measuring the warmth, which is probably the reason that they have not been able to duplicate it in a solid state amp. You can hear a tube amp “Warm Up” the longer it is on. Your audience’s ears will not tire of a tube amp sound in the way that they will from solid state. The warmth acts like a blanket, soothing the ears. The WARM tube amp sound blends with the rest of the band perfect.\nMORE TONE - Each tube amp sounds different, each with its own unique tone. You can hear this tone between manufacturers and even between the same exact models. Changing out the tubes will even change the tone. No two guitarists will sound the same through the same tube amp, as the amp will respond to the individuals playing technique in a totally different way. Tube amps have been described by many veteran guitarists as “Tone Monsters”.\nTHICK AND HEAVY – Tube amps sound fat and thick, and will sound even fatter as the volume is turned up, creating that famous wall of sound. Tube amps sound HUGE!\nULTIMATE DISTORTION – Most electric guitarists want at least a little edge to their guitar sound, otherwise known as distortion, while others want screaming leads. Tubes, by their very nature of operation distort sound, and do so in the most pleasing way to the human ear, by Pushing and Pulling on each other. I have heard many tech guys go on and on about why tube distortion is better and I do not feel like quoting all of their boring documents about it. Let’s just say, YES, there are specific proven reasons why, but who cares, everybody agrees tube distortion is far superior to solid state.\nCOMPRESSION – Tubes compress your sound in several ways, usually when to much power is demanded from the output transformer. The transformer can not handle the signal peaks and softly rounds them off, causing even more distortion. Trust me, it’s a good thing.\n\nnow for the disadvantages of tubes amps.\n\nMaintenance Costs - If you
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wut kinda amp are u using? and how much are you going?
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Good question, there are so many to chose from.  You have to ask yourself a few questions first:\n\nWhat style do you play?  What do your guitar influences use?  What kind of sound do you want?  What are your needs?  What kind of venues will you use the amp?  How much are you willing to pay?\n\nTake these answers to the music stores when you shop.  Don't just go to one store either.  Look around and compare.  A drive within an hours distance is worth the trip.  Bigger isn't always better, since most amps get mic’d thru a PA system.  You may be better off with a good 120 Watt amp vs. a full stack.\n\nI recommend a tube amp, they cost a bit more, but you will notice a difference.  Good brand names are Marshal, Fender, Roland, and Mesa-Bogie.  I recommend separate channels if possible.  Don't be impressed with internal effects with distortion and reverb.  Chances are you use quality stomp boxes or processors.\n\nOnce you find a brand you are happy with don’t rush to buy.  Look in the classifieds, eBay, internet searches, or garage sales for a better deal.  Use caution though, you get what you pay for. \n\nBest whishes.