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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

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:

Above is a new architecture of the transistor which is applied in high voltage vertical FET (HVVFET ™) to achieve high operating voltage and very high power packaging density. This approach offers many advantages to designers of power amplifiers. High voltage solutions help designers to simplify the matching circuit discrete devices. Achieving high power through the device causing high voltage impedance level, allows the network to the appropriate circuit with fewer components smaller area. As a result, a series of matching not only the smaller, less expensive solutions, but offers higher reliability as well as there fewer parts with the potential to fail. This circuit is suitable also show less loss than a low impedance solution that has a higher transformation 50 ohm impedance ratio desired.

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