2x5.8 AUDIO AMPLIFIER
MB3730
12W AUDIO AMPLIFIER
MB3731
18W AUDIO AMPLIFIER
Thursday, January 31, 2008
Monday, January 28, 2008
AUDIO PREAMP
5 BAND GRAPHIC EQUALIZER
LA 3600
STEREO TAPE PREAMPLIFIER
LA 3160
2 CHANEL TAPE HEAD PREAMPLIFIER
LA3161
EQUALIZER AMPLIFIER
LA3210
2 CHANEL EQUALIZER
LA 3220
MICROPHONE PREAMPLIFIER
LA3225T/LA3226T
LA 3600
STEREO TAPE PREAMPLIFIER
LA 3160
2 CHANEL TAPE HEAD PREAMPLIFIER
LA3161
EQUALIZER AMPLIFIER
LA3210
2 CHANEL EQUALIZER
LA 3220
MICROPHONE PREAMPLIFIER
LA3225T/LA3226T
Sunday, January 27, 2008
D-MOS POWER AMPLIFIER (TDA7294)
PIN CONECTION
SCHEMATIC DIAGRAM
SCHEMATIC DIAGRAM
ELECTRICAL CHARACTERISTIC (Refer to the test Circuit)
Vs = -35V, RL = 8W, GV = 30db,
Rg = 50W, Tamb = 25ºC, F=1kHz
Rg = 50W, Tamb = 25ºC, 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
| number | name | |
|---|---|---|
| Transistors | ||
| 12x | Q1, Q2, Q5, Q7, Q9, Q10 | MPSA 06 |
| 10x | Q3, Q4, Q6, Q8, Q11 | MPSA 56 |
| 4x | Q13, Q14 | 2N 3439 |
| 4x | Q12, Q15 | 2N 5416 |
| 2x | Q16 | MJE 15030 |
| 2x | Q17 | MJE 15031 |
| 4x | Q18, Q20 | MJ 15003 |
| 4x | Q19, Q21 | MJ 15004 |
| Diodes | ||
| 12x | D1, D2, D3, D4, D11, D12 | 1N4007 |
| 12x | D5, D6, D7, D8, D9, D10 | 1N4148 |
| 8x (15x) | D13, D14, D15, D16 | 20 V Zener +5% tolerance, 0.5W |
| Capacitors | ||
| 2x | C1 | 390 pF mica |
| 14x | C2, C3, C15, C16, C23, C24, C25 | 100nF/100V film |
| 8x | C7, C12, C17, C18 | 100nF/50V film |
| 12x | C4, C5, C13, C14, C21, C22 | 100uF/63V radial electrolytic |
| 2x (4x) | C6a, C6b | 220uF/16V bi-polar electrolytic (4x 330uF/16V) |
| 2x | C8 | 180pF mica |
| 2x | C9 | 47pF mica |
| 4x | C10, C11 | 10pF mica |
| 4x | C19, C20 | 10nF/50V film |
| Rezistors | ||
| All resistors are 1% carbonic or metalised 0,5W if not noted otherwise | ||
| 2x | R1 | 20 kohm |
| 2x | R2 | 2 kohm |
| 16x | R3, R4, R5, R6, R7, R8, R9, R10 | 300 ohm |
| 6x | R11, R12, R27 | 1.2 kohm |
| 4x | R13, R14 | 2.2 kohm |
| 4x | R15, R16 | 12 kohm |
| 4x | R17, R18 | 11 kohm |
| 2x | R19 | 1.1 kohm |
| 2x | R20 | 22 kohm |
| 4x | R21, R22 | 30 ohm |
| 4x | R23, R24 | 360 ohm |
| 4x | R25, R26 | 1 kohm |
| 4x | R28, R29 | 270 ohm |
| 4x | R30, R31 | 3.9 kohm 1/2 W |
| 6x | R32, R33, R51 | 82 ohm |
| 4x | R34, R35 | 330 ohm |
| 2x | R36 | 220 ohm |
| 8x | R37, R38, R39, R40 | 680 ohm |
| 8x | R41, R42, R43, R44 | 10 ohm 1/2 W |
| 8x | R45, R46, R47, R48 | 0.33 ohm 5 W wire-wound |
| 4x | R49, R50 | 10 ohm, 2 W |
| Other | ||
| 2x | P1 | 2 kohm more turn cermet trimmer |
| 1x | T1 | Toroid power transformer SEC 2x40V AC 300W |
| 8x | C1P, C2P | 4700uF/63V (6x 6800uF/63V) |
| 8x | C3P | 100nF/200V |
| 1x | D1P | Bridge rectifier 35A/200V |
| 5x | Fuse casing | |
| 1x | F1 | Fuse 3.15A T |
| 4x | F2, F3, F4, F5 | Fuse 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
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
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.
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
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Power Amplifuer PCB
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circuit By : Youssef Bouterfes
Saturday, January 5, 2008
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
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
