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10 w audio amplifier with bass boost circuit description

2015-01-06 23:44  
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This article is 10 w audio amplifier with bass boost circuit description. Master the principle is very effective method is to combine text read schematics. The circuit is very simple, very cheap, very effective. No pre-amplifier requirements. Unable to locate TLE2141C chip. It is widely used  NE5532  dual IC, however, obviously, the output power will be included in the 9.5 - 11.5 w range as the supply rails must not exceed ± 18 v. Bass lift curve can reach a maximum of 16.4 db @ 50 Hz. In any case, even if the bass control is rotated fully counterclockwise, the amplifier frequency response shows a modest increase Curve: 0.8 db @ 400 Hz, 4.7 db @ 100 Hz and 6 db @ 50 Hz (mean 1 khz) . Can be directly connected to CD players, tuners and tape drives. Schematic shows left channel only, but C3, C4, IC1 and the power supply is common to both channels. Figures in parentheses show the correct channel pin connection IC1. Log type is P2 will ensure a more linear regulator bass boost. Not more than 18 18 v supply. Third and fourth quarters must be mounted on heatsink. D1 must be in thermal contact with Q1. Quiescent current (best measured with a multimeter in series with Q3 Emitter) is not critical. Set the volume to a minimum and R3 its minimum resistance. Power circuit and adjust R3 to read a current figure of about 20-25 Ma. Connected to the same point on the ground both sides of the J1, P1, C2, C3 & C4. C9 connected to the output ground.


Circuit diagram:

10W Amplifier


P1_________________22K   Log.Potentiometer (Dual-gang for stereo)
P2________________100K   Log.Potentiometer (Dual-gang for stereo)
R1________________820R   1/4W Resistor
R2,R4,R8____________4K7  1/4W Resistors
R3________________500R   1/2W Trimmer Cermet
R5_________________82K   1/4W Resistor
R6,R7______________47K   1/4W Resistors
R9_________________10R   1/2W Resistor
R10__________________R22   4W Resistor (wirewound)

C1,C8_____________470nF   63V Polyester Capacitor
C2,C5_____________100μF   25V Electrolytic Capacitors
C3,C4_____________470μF   25V Electrolytic Capacitors
C6_________________47pF   63V Ceramic or Polystyrene Capacitor
C7_________________10nF   63V Polyester Capacitor
C9________________100nF   63V Polyester Capacitor

D1______________1N4148    75V 150mA Diode

IC1_____________NE5532    Low noise Dual Op-amp

Q1_______________BC547B   45V 100mA NPN Transistor
Q2_______________BC557B   45V 100mA PNP Transistor
Q3_______________TIP42A   60V 6A    PNP Transistor
Q4_______________TIP41A   60V 6A    NPN Transistor

J1__________________RCA audio input socket

Power supply parts:

R11_________________1K5  1/4W Resistor

C10,C11__________4700μF   25V Electrolytic Capacitors

D2________________100V 4A Diode bridge
D3________________5mm. Red LED

T1________________220V Primary, 12   12V Secondary 24-30VA Mains transformer

PL1_______________Male Mains plug

SW1_______________SPST Mains switch

Technical data:

Output power:10 Watt RMS into 8 Ohm (1KHz sinewave)Sensitivity:115 to 180mV input for 10W output (depending on P2 control position)Frequency response:See Comments aboveTotal harmonic distortion @ 1KHz:0.1W 0.009% 1W 0.004% 10W 0.005%Total harmonic distortion @ 100Hz:0.1W 0.009% 1W 0.007% 10W 0.012%Total harmonic distortion @ 10KHz:0.1W 0.056% 1W 0.01% 10W 0.018%Total harmonic distortion @ 100Hz and full boost:1W 0.015% 10W 0.03%Max. bass-boost referred to 1KHz:400Hz = 5dB; 200Hz = 7.3dB; 100Hz = 12dB; 50Hz = 16.4dB; 30Hz = 13.3dBUnconditionally stable on capacitive loads


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