Saturday, March 15, 2008

SYMMETRICAL HIFI POWER AMPLIFIER

DESCRIPTION

Characteristic Summary : power amplifier mosfet complementary symmetrical hifi complete with very height output
power and good dynamic, because real delay of the way in level of end exploited for
compensation of frequency to be obtained absolute stability

Output Power : 140 watt at 8 ohm each chanel / 180 watt maximum at 8 ohm
180 watt at 4 ohm each chanel / 250 watt maximum at 4 ohm

Distortion : less than 0,01 % at 140 watt and 8 ohm / at 180 watt and 4 ohm

Input Sensitivity : 1 volt-ef for 130 watt at 8 ohm

Input Impedance : 25 Kilo-ohm

Frequency Characteristic : 4 - 50000 Hz (with source resistance 600 ohm)


BLOCK DIAGRAM



POWER SUPLAY


SCHEMATIC DIAGRAM



COMPONENT LIST




LAYOUT PCB (BACK SIDE)



LAYOUT PCB (FRONT SIDE)

Thursday, January 31, 2008

MB audio IC

MB3722
2x5.8 AUDIO AMPLIFIER



MB3730
12W AUDIO AMPLIFIER



MB3731
18W AUDIO AMPLIFIER

Sunday, January 27, 2008

D-MOS POWER AMPLIFIER (TDA7294)

PIN CONECTION








SCHEMATIC DIAGRAM


ELECTRICAL CHARACTERISTIC (Refer to the test Circuit)
Vs = -35V, RL = 8W, GV = 30db,
R
g = 50W, Tamb = 25ÂșC, F=1kHz

200W Power Amplifier

This amplifier for universal usability, such as for home audio, seminar and for games (PS3 games, Xbox and others)
 
Schematic Diagram




numbername
Transistors
12xQ1, Q2, Q5, Q7, Q9, Q10MPSA 06
10xQ3, Q4, Q6, Q8, Q11MPSA 56
4xQ13, Q142N 3439
4xQ12, Q152N 5416
2xQ16MJE 15030
2xQ17MJE 15031
4xQ18, Q20MJ 15003
4xQ19, Q21MJ 15004
Diodes
12xD1, D2, D3, D4, D11, D121N4007
12xD5, D6, D7, D8, D9, D101N4148
8x (15x)D13, D14, D15, D1620 V Zener +5% tolerance, 0.5W
Capacitors
2xC1390 pF mica
14xC2, C3, C15, C16, C23, C24, C25100nF/100V film
8xC7, C12, C17, C18100nF/50V film
12xC4, C5, C13, C14, C21, C22100uF/63V radial electrolytic
2x (4x)C6a, C6b220uF/16V bi-polar electrolytic (4x 330uF/16V)
2xC8180pF mica
2xC947pF mica
4xC10, C1110pF mica
4xC19, C2010nF/50V film
Rezistors
All resistors are 1% carbonic or metalised 0,5W if not noted otherwise
2xR120 kohm
2xR22 kohm
16xR3, R4, R5, R6, R7, R8, R9, R10300 ohm
6xR11, R12, R271.2 kohm
4xR13, R142.2 kohm
4xR15, R1612 kohm
4xR17, R1811 kohm
2xR191.1 kohm
2xR2022 kohm
4xR21, R2230 ohm
4xR23, R24360 ohm
4xR25, R261 kohm
4xR28, R29270 ohm
4xR30, R313.9 kohm 1/2 W
6xR32, R33, R5182 ohm
4xR34, R35330 ohm
2xR36220 ohm
8xR37, R38, R39, R40680 ohm
8xR41, R42, R43, R4410 ohm 1/2 W
8xR45, R46, R47, R480.33 ohm 5 W wire-wound
4xR49, R5010 ohm, 2 W
Other
2xP12 kohm more turn cermet trimmer
1xT1Toroid power transformer SEC 2x40V AC 300W
8xC1P, C2P4700uF/63V (6x 6800uF/63V)
8xC3P100nF/200V
1xD1PBridge rectifier 35A/200V
5x
Fuse casing
1xF1Fuse 3.15A T
4xF2, F3, F4, F5Fuse 5A F
8x
Insulative bed under transistors + screw insulatives 16x
20x
Solder eye M4
2m
Shrinking spaghetti 4mm

Tuesday, January 15, 2008

150W MP3 Car Amplifier

mp3 player mp3 song
Block Diagaram

Three Band Active Tone Control


Click Image for Enlarge

Description :
LF353 Wide Bandwidth Dual JFET Input Operational Amplifier
General Description
These devices are low cost, high speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage (BI-FET II technology). They require low supply current yet maintain a large gain band width product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents. The LF353 is pin compatible with the standard LM1558 allowing designers to immediately upgrade e the overall performance of existing LM1558 and LM358 designs. These amplifiers may be used in applications such as high speed integrators, fast D/A converters, sample and hold circuits and many other circuits requiring low input offset voltage, low input bias current, high input impedance, high slew rate and wide bandwidth. The devices also exhibit low noise and offset voltage drift. (National Semiconductor)

Features :
Internally trimmed offset voltage: 10 mV
Low input bias current: 50pA
Low input noise voltage: 25 nV
Low input noise current: 0.01 pA
Wide gain bandwidth: 4 MHz
High slew rate: 13 V/us
Low supply current: 3.6 m
High input impedance: 1012.
Low total harmonic distortion : <>
Low 1/f noise corner: 50 Hz
Fast settling time to 0.01%: 2 us

Power Amplifier

Click Image for Enlarge


LA47536 Four-Channel 45 W BTL Car Audio Power Amplifier
The LA47536 is a 4-channel BTL power amplifier IC developed for use in car audio systems. The output stage features

- A pure complimentary structure that uses V-PNP transistors on the high side and NPN transistors on the low side to provide high power and superb audio quality.

- The LA47536 includes almost all the functions required for car audio use, including a standby switch, a muting function, and each protection circuit. It also provides a self-diagnosis function (output offset detection). (Sanyo)

Functional Description
1. Standby Switch Function (pin 4)
The pin 4 threshold voltage is set to be 2 VBE. When Vst is 2.0V or higher, the amplifier will be on, and when Vst, is 0.7V or lower, the amplifier will be off. Note that pin 4 requires an operating current of at least 40uA.

2. Muting Function
The IC is set to the muted state by setting pin 22 to the ground potential. In this state, the audio output is muted. The time constant with which the muting function operates is set by an external RC circuit, and this time constant influences the pop noise that occurs when the amplifier is turned on or off.
The muting on and off times due to the recommended external component values (R=10k, C=3.3uF) are as follows.
Muting on time: 50ms
Muting off time: 20ms

3. Self-Diagnosis Function (Speaker burnout prevention)
During steady state operation, the LA47536 detects, internally, whether or not an abnormal amplifier output offset has occurred, and outputs this signal from pin 25. Applications can prevent speaker burnout and other problems by having the system microcontroller detect this pin 25 output signal and control either the standby state or the power supply. (An abnormal output offset may be caused by, for example, input capacitor leakage current.) The pin 25 signal is turned off by setting pin 1 to the ground potential.

4. Oscillator Stability
In some cases, parasitic oscillations may be induced by the PCB layout. This oscillation can be eliminated by adding the components listed below. Note that the optimal capacitor value must be verified by testing in the actual mounted state in the end product. Connect a capacitor and resistor (0.1uF and 2.2) in series between each output pin and ground.

5. Audio Quality (Low band)
The frequency characteristics in the low frequencies can be improved by making the capacitance of the input capacitors variable. The recommended capacitance is 2.2uF and smaller.

6. Protection Circuits
Do not ground the outputs with the STBY voltage at around 1.4V. Also, do not turn the IC off in the grounded state with a time constant provided for the STBY voltage.

7. Pop Noise
Although the LA47536 includes an pop noise prevention circuit, pop noise can be reduced even further by using the muting function as well. Activate the muting function at the same time as power is applied. Then, after the output DC potential has stabilized, turn off the muting function. When turning the amplifier off, first turn on the muting function and then turn off the power supply. These two methods are effective at minimizing pop noise.

Pre Amplifier PCB

Click Image for Enlarge


Power Amplifuer PCB

Click Image for Enlarge
circuit By : Youssef Bouterfes

STK POWER AMPLIFIER

STK0059
55W POWER AMPLIFIER



STK0060II
60W POWER AMPLIFIER



STK0070II
70W POWER AMPLIFIER



STK0080II
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STK3042
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STK0030
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STK0039
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STK0040
40W POWER AMPLIFIER



STK0050II
50W POWER AMPLIFIER

Saturday, January 5, 2008

AN AUDIO IC

AN7177
2x18W POWER AMPLIFIER



AN7173NK
2x12.5W POWER AMPLIFIER



AN7168
2x5.7W POWER AMPLIFIER



AN7161N
23W POWER AMPLIFIER



AN7147
2x55W POWER AMPLIFIER

KA audio IC

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KA2213
TAPE POWER AMPLIFIER 1W



KA2214
POWER AMPLIFIER 2x1.6W



KA22135
TAPE PREAMP

Friday, January 4, 2008

TDA IC AUDIO

TDA1554Q
AUDIO AMP 2x11W



TDA1553Q
POWER AMP 2x22W



TDA1521
POWER AMP 2x12W



TDA1514
POWER AMP 40W



TDA1010A
POWER AMP 9W



TDA 2040
20W HIFI AUDIO AMPLIFIER



TDA2009
POWER AMP 2x9W



TDA2008
12W POWER AMPLIFIER



TDA2004
2x10W POWER AMP



TDA2003
10W POWER AMPLIFIER



TDA7350
2x12W POWER AMP



TDA7241
20W POWER AMPLIFIER



TDA7233S
1.6W POWER AMPLIFIER



TDA7057Q
2x3W POWER AMP



TDA2040

20W HIFI POWER AMP