Parts list :
R1 : 200 Ohm 1 / 4 W Resistor
R2 : 200K 1 / 4 W Resistor
R3 : 30K 1 / 4 W Resistor
R5 : 1K 1 / 4 W Resistor
R6 : 5K 1 / 4 W Resistor
R7, R10 : 1 Meg (5%) 1 / 2 W Resistor
R8, R9 : 0.4 Ohm 5 W Resistor
R11 : 10K Pot
R12, R13 : 51K 1 / 4 W Resistor
R14 : 47K 1 / 4 W Resistor
C1 : 100uF 35V Electrolytic Capacitor
C2 : 0.011uF Capacitor
C3 : 3750pF Capacitor
C4, C6 : 1000pF Capacitor
C5, C7, C8 : 0.001uF Capacitor
C9 : 50pF Capacitor
C10 : 0.3uF Capacitor
C11, C12 : 10.000 uF 50V Electrolytic Capacitor
U1, U2 : Op Amp 741
U3 : ICL8063 Audio Amp Transister Driver thingy
Q1 : 2N3055 NPN Power Transistor
Q2 : 2N3791 PNP Power Transistor
BR1 : 250 V 6 Amp Bridge Rectifier
T1 : 50V Center Tapped 5 Amp Transformer
S1 : SPST 3 Amp Switch
S2 : DPDT Switch
F1 : 2 Amp Fuse
SPKR1 : 8 Ohm 50W Speaker
MISC : Case, Knobs, Line Cord, Binding Posts Or Phono Plugs (For Input And Output), Heatsinks For Q1 And Q2

General purpose 50 watt audio amplifier based L8063

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An integral part of modern multimedia computer is the presence of two active audio speakers (mounted on a monitor or set next to it). Due to a number of physical limitations of the two small computer speakers can not achieve a good reproduction of the full range of sound frequencies. Especially collapses and distorted bass. Therefore, to obtain high-quality background music is usually used yet a third column – the subwoofer.

In high quality active speakers, such as company Altec Lansing, a built-in audio amplifier has an output labeled “SUB” (model ACS40, Fig. 5.1). It is designed to connect low-frequency active column.

This circuit uses IC K174UN14 from Russia. Its gain depends on the ratio of resistors R8-R9. Chain of elements R10-C6 band of amplified frequencies limits that increases the stability of work, excluding the occurrence of generation at frequencies above 100 kHz. Signals from the output of “SUB” come to the mixer, collected from field-effect transistors (VT1, VT2). Provides isolation between the mixer outputs and amplifies the signal by about 3 times. Resistor R6 sets the desired level of sound in the low column BA1 with respect to the lateral columns, and the main (overall) volume control and tone control is usually performed in the main amplifier on the body in a side column or from the program.

This scheme has the following main amplifier specifications:
1) output power at 4 ohm 4 W;
2) The band of amplified frequencies 60 … 120 000 Hz;
3) current consumption at Vin = 0 to 35 mA;
4) The supply voltage can range from 9 … 15 V;
5) THD of less than 0.5%.

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The scheme chosen for its high quality sound, great power, the relative ease of setting up a high potential for bass.

Correctly assembled amplifier is immediately reduced to setting the quiescent current setting. He put up trimmer R15. First, put up a minimum quiescent current and allow the amplifier to work for 15-20 minutes on medium power. After this input shorting switch off and expose the acoustics of a quiescent current of 50-80 mA. It measures the decline in voltage on the resistors R24 – R27, it should be in the range 0,22-0,36 V. The voltage on the right and the left arm might be slightly different.

The scheme is desirable to use film capacitors K73-17 or foreign analogues, C8, C12, C13 – can be ceramics. Weekends and proximity with transistors it is desirable to choose pairs, well, at least one of the parties, as mutually desirable to select and VT1, VT3 and VT2, VT4. In the photo resistors R1 and R2 at 0.25 W, and later they were replaced by 2W, although enough of resistors and 0.5 Watts. For transistors VT5, VT7 made a small aluminum heatsink. The dimensions of the PCB 140h80mm.

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Key features :

This chip is recommended for use in the entry-level subwoofer in your car. And the scheme presented is optimized for this application. Although, of course, no one bothers to play with it a full signal.

Parts List :
R1,R2,R3 : 10K
R4 : 1K
C1,C2 : 0,22uF
C3 : 10uF/16V
C4, C5 : 10000uF/25v
C6 : 0,1uF
C7 : 4700uF/25V
VT1 : KT3107
HL1 : any
DA1 : TDA1562

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