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The above amplifier circuit based on IC is STK075G, and another equation that is STK084G, STK085, STK086G. and among ic I mentioned that I recommend using ic high supply voltage and high output power and good quality. You can see every ic datasheet at Alldatasheet.com above. Supply voltage between 20 to 55 Volt DC. Part List R1 = 1K R2 = 100R R3 = 100R R4 = 4.7R R5 = 56K R6 = 47R C1 = 1uF C2 = 470pF C3 = 100uF C4 = 100uF C5 = 1800pF C6 = 1uF C7 = 1800pF C8 = 0.047uF C9 = 100uF U1 = STK075G,  STK084G, STK085, STK086G

Low-Cost Electronic Project of RF Synthesizer Uses Generic ICs . You can design a hardware-based frequency synthesizer with one inexepensive IC and a few passive components. Such synthesizer chips are not always available, however, because they are typically single-sourced and are not in stock with parts distributors. The need for a working circuit in a short time and using common parts prompted the creation of the circuit in this Design Idea. The synthesizer covers the US commercial AM (amplitude-modulation) broadcast band. It tunes in 10-kHz steps from 500 to 1800 kHz, but you can scale the frequencies for other applications. The PLL (phase-locked loop) time base is a 100-kHz, tuning-fork-cut crystal of the same size as those in wrist watches. Using a more common crystal requires some extra parts to scale the frequency. Note that if you attempt to use one of these tiny crystals with a CMOS gate oscillator circuit, however, the circuit will either fail to start or exhibit visible jit...

Amplifier circuit is very suitable for use in car audio speakers that use a subwoofer, with a power output of about 60W and impedance of 4 Ohm. Supply voltage ranging from 12V to 35 volts with currents +, -, and ground. If using battery then use 12V DC to DC converter which produces 3 voltage +, -, and ground. Component List : Resistor R1 = 10K R2 = 4K7 R3 = 10R R4 = 2.2R R5 = 10R R6 = 10K R7 = 680R R8 = 300R Capacitor C1 = 1uF C3 = 10uF C4 = 10uF C5 = 470uF C6 = 0.1uF C7 = 100uF C8 = 120pF C9 = 270pF C10 = 47uF IC  = OM931 , OM961

Overview The STK412-000 series are class H audio power amplifier hybrid ICs that feature a built-in shift power supply circuit. These ICs provide high efficiency audio power amplification by controlling (switching) the supply voltage supplied to the power transistors according to the detected level of the input audio signal. Power Sourse of  Two-Channel Shift Power Supply Audio Power Amplifier ICs 180W + 180 W Circuit diagram and other info view