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This amplifier circuit has a stereo output with a power output of 2 x 5.8 Watt with impedance 4. The frequency response from 30Hz up to 20kHz. Amplifier circuit based on IC KA2211 and supported several other components. Minimum supply voltage of 10 Volt to 18 Volt. Below is schematic power amplifier with IC KA2211 suitable for home power amplifier. Home amplifier schematics with IC KA2211

  Basic operation of this amplifier is on IC TEA2021 , In this circuit minimum require voltage is 4 volts and maximum voltage 25 volts. Power output 14 Watt with 4 Ohm impedance. See this schematic.

Already Know about the transistor above? transistor above is one of the transistors that are applied at the amplifier end audio amplifiers. Because the power output and good quality of this transistor is very popular with high-power amplifier makers. Transistors on no other than is 2SC2922 and 2SA1216, transistor pair is already very well known as a reliable amplifier. With a price not too expensive and not too large transistor large is also very suitable. And this transistor has its own code for its quality, its code is like 5DY, 57P, 85Y, 92P, etc.. to see datsheet transistor can be seen below. Maximum Voltage  180V maximum collector current  17A Total power output  200W To more clearly and accurately datasheet can be found here.

This 200W power amplifier circuit using IC STK 4050. STK 4050 is a power amplifier module is very powerful, because the IC is already a module then only needed a little extra components to build a reliable 200W Power Amplifier. Here is a picture series of Power Amplifier ICs 200W use STK 4050 complete with its power supply:

HiFi Headphone amplifier HiFi Headphone amplifier

7.3W x 2CH audio amplifier ic

VSX D3S - Pioneer Elite power amplifier section schematic Full Circuit [Amplifier] Split

Minimum voltage require 12 Volts and maximum voltage require 40 Volts DC . This circuit is very simple , but output is very high . Power output 120 Watt 4 Ohm impedance. See circuit below : TDA2025 Very high intregated Power IC

Audio amplifier circuit is very suitable for use at home, using a subwoofer speaker, or woofer speaker. Usually, also called home amplifier, audio amplifiers are based on the IC and ic are used still in series with type STK457 STK and besides it also can use the STK459, 460, 461, 463, 465. And each ic has the quality of each one, please look at alldatasheet.com. Part List : R1 = 22K R2 = 22K R3 = 330R R4 = 33K R5 = 1K R6 = 1K R7 = 4.7R R8 = 3K3 R9 = 3K3 R10 = 4.7R R11 = 100R R12 = 33K R13 = 330R C1 = 0.1uF C2 = 0.1uF C3 = 100uF C4 = 100uF C5 = 0.1uF C6 = 47uF C7 = 47uF C8 = 0.1uF C9 = 100uF C10 = 100uF U1 = STK457,STK459, 460, 461, 463, 465.