Audio003

                                          

50 Watt Audio Amplifier
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Schematic design of 50W audio amplifier
Part Components of 50W Audio Amplifier:
Capacitors	Resistors
C1          =    100 μF / 35V Polyester C2          = 0.011 μF C3          =  3750 pF C4, C6    =       1 nF C5,C7,C8= 0.001 μF C9          =     50 pF C10        =    0.3 μF C11,C12 =10,000μF / 50V Electrolytic   Semiconductors U1,U2 = 741 U3      = ICL8063 Q1      = 2N3055 Q2      = 2N3791	R1         =   200Ω ¼W R2         = 200KΩ ¼W R3         =   30KΩ ¼W R5         =     1KΩ ¼W R6         =     5KΩ ¼W R7, R10 =    1MΩ ½W 5% R8, R9   =    0.4Ω 5W R11       =   10KΩ Log.Potentiometer R12,R13=   51KΩ ¼W R14       =   47KΩ ½W   Others T1 Mains transformer 220V Primary, 24V + 24V Secondary 5A F1 3.15A Fuses with sockets SW1 SPST mains switch SW2 DPDT switch
Notes
This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low pass filter at the input, it makes a great amp for a small subwoofer. R4 is skipped and not used. Distortion is less than 0.1% up to 100HZ and increases to about 1% at 20kHz. Q1 & Q2 must be mounted on heatsink.

Source : Electronics Lab