difference between step up Transformers & amplifiers

step up transformer can boost the voltages,the why can't you called as a amplifier?
what if the differences between transformer and amplifiers?

Step Up Transformer 110v 220v

Step Up Transformer On-line Directory Step Up Transformer Transformer "Request For Quotation" Service Step Up Transformer Repair & Services "Request For Quotation" Step-up transformer 110v 220v design is one whose secondary voltage is greater than its primary voltage. This kind of transformer "steps up" the voltage applied to it. For instance, a step up transformer is needed to use a 220v product in a country with a 110v supply. What 'Rating' Transformer Is Needed? Step-up transformer 110v 220v depends entirely on the products you will be using it with. Give your transformer supplier a detailed list of all the products you will be using with it - and also their maximum outputs. From this information he/she will be able to advise the correct step up transformer rating needed. A step up transformer 110v 220v converts alternating current (AC) from one voltage to another voltage. It has no moving parts and works on a magnetic induction principle; it can be designed to "step-up" or "step-down" voltage. So a step up transformer increases the voltage and a step down transformer decreases the voltage. 30 Watt Audio Power Amplifier Posted Apr 17, 2013 at 3:10 pm Including Preamp, Tone Controls, Reg dc Power Supply, 18 Watt into 8 Ohm – 30W into 4 Ohm loads This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality. The Power Amplifier section employs only three transistors and a handful of resistors and capacitors in a shunt feedback configuration but can deliver more than 18W into 8 Ohm with 0.08% THD at 1KHz at the onset of clipping (0.04% at 1W – 1KHz and 0.02% at 1W – 10KHz) and up to 30W into a 4 Ohm load. To obtain such a performance and to ensure overall stability of this very simple circuitry, a suitable regulated dc power supply is mandatory. This is not a snag because it also helps in keeping noise and hum of the preamp to very low levels and guarantees a predictable output power into different load impedance. Finally, as the amplifier requires only a single rail supply, a very good dc voltage regulator capable of supplying more than 2 Amps at40V can be implemented with a few parts also.This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality. The Power Amplifier section employs only three transistors and a handful of resistors and capacitors in a shunt feedback configuration but can deliver more than 18W into 8 Ohm with 0.08% THD at 1KHz at the onset of clipping (0.04% at 1W – 1KHz and 0.02% at 1W – 10KHz) and up to 30W into a 4 Ohm load. Circuit diagram: main differences Transformer Amplifier Transformers are unable to amplify (step up) an ac input Voltage without reducing (stepping down) it`s current capability. Amplifier can amplify both current and Voltage at the same time. We can have 1V at 1uA to drive the input but might also get many volts at many Amps at the output. Transformer`s coil windings never requires a dc Voltage to operate. Sometimes a dc Voltage might be present in a transformer winding for auxiliaries but the dc is not required for the operation of the transformer. Amplifier almost always requires a dc working supply Voltage to operate. Transformer has more winding added to its secondary winding to obtain Voltage amplification. An Amplifier actually modulates a fixed dc source Voltage in response to an ac input Voltage to obtain output Voltage amplification. A transformer`s input current is proportional to its load current. Amplifier’s input current is normally almost independent of its load current. A transformer is like a gearbox, whereas an amplifier is like an engine. The gearbox converts energy like a transformer. Amplifier is like an engine, which consumes fuel to give output. Similarly amplifier consumed DC supply to give output. A step up transformer can amplify a specified type of input which is the sinusoidal input or time varying input and add to that the range of input the transformer is very flexible in range. Amplifier can amplify any signal and while the amplifier would have a limited range then in the saturation state.