LG CM9520 - Hi Fi System NO Sound

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 This is great mini Hi Fi System from LG. resonantly i got this one without sound. so i check that for my costumer and he is so exited because he don't want to wast his money.this set is only three month

Denon DN-X1500 DJ Mixer

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look at this, its "DENON"

STK 4191

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inside

stk4191 inside

Create your 400w stereo amplifier today

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This is another great power amplifier witch designed by using 2SC5200 and 2SA1943. You can get super heavy quality  power in this power amplifier and it delivers 200W Rms through a 4Ω speaker by one channel.

In this amplifier i have used 36V 8A transformer for the Power supply along with 10000MF 63V smoothing

STK4231 II 200W power amplifier with USB & FM

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This is another great power amplifier that designed by using STK4231 II. You can get superb audio quality and unmatched more power in this power amplifier and it delivers 200W Rms through a two 8Ω speaker.In here what i have don is i add USB mp3 player in this same amplifier.its working properly and my costumer also like this.

 here is some pic..

main power amp pcb

TLC 272 PREAMPLIFIER

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here is the one good circuit what i found with sharp tone controller.for best performance use very smooth power supply for this circuit. the circuit shown here must duplicated to obtain a stereo preamplifier.

TDA 2822 headphone amplifier

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Microphone Amplifier Module

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This circuit based on a very simple single transistor amplifier which can use with any power amplifier. very low noise, 45dB stage gain. Input impedance: 2700 Ohm.


Parts:-

R1______________1M2  1/4W Resistor
R2______________5K6  1/4W Resistor
R3______________1K   1/4W Resistor
C1,C3___________4µ7   63V Electrolytic Capacitors
C2____________100µF   25V Electrolytic Capacitor
Q1____________BC550C  45V 100mA Low noise High gain NPN

MINI STEREO AMPLIFIER (TEA2025)

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This mini amplifier is based on the Thomson Type TEA2025. In this 16-pin DIL device hides a stereo amplifier that with a supply voltage of 9 V will provide 1watt output per channel into a 4-ohm loudspeaker. At full output, the input sensitivity is about 25 mVpp. If this is too sensitive, a resistor R may be connected between pin 6 and C7 and between pin 11and C2. The sensitivity then becomes (25+ Y2R) mV, provided R> 1k. Furthermore, the supply voltage may lie between 3 V and 12 V. The operation of the IC cannot be discussed here, but for those interested its internal circuit diagram is reproduced in Fig.

INTEGRATED STEREO AMPLIFIER

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The Type TDA1521 from Valvo/Mullard is an integrated HiFi stereo power amplifier designed for mains fed applications such as stereo TV. The device works optimally when fed from a ± 16V supply, and delivers a maximum output power of 2 x 12W into 8 ohm. The gain of the amplifiers is fixed internally at 30 dB with a spread of 0.2 dB to ensure optimum gain balance between the channels. A special feature of the chip is its built-in mute circuit, which

HI-FI HEADPHONE AMPLIFIER

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This l-watt amplifier lends itself par excellence for use as driver for a low impedance headphone or as output stage in a hi-fi preamplifier driving an active loudspeaker. Many preamplifiers do not permit long, unscreened leads to be connected to them, but the present amplifier accepts these happily.

The amplifier delivers a maximum power of 1 watt into 8 Q for an input signal of about 500 mVrms.

Basic OP-AMP Stages

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using 741

741 Operational Amplifier

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The 741 is a high performance operational amplifier with high open loop gain, internal compensation, high common mode range and exceptional temperature stability. It is short circuit proof and allows for nulling of offset voltage.

Features
• Internal frequency compensation
• Short circuit protection
• Offset voltage null capability

mic free amp using 4558

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DESCRIPTION

The 4558 is a dual operational amplifier that is internally compensated. Excellent channel separation allows the use of a dual device in a single amp application, providing the highest packaging density. The NE/SA/SE4558 is a pin-for-pin replacement for the RC/RM/RV4558.

FEATURES
• 2MHz unity gain bandwidth guaranteed
• Supply voltage ±22V for SE4558 and ±18V for NE4558
• Short-circuit protection
• No frequency compensation required
• No latch-up
• Large common-mode and differential voltage ranges
• Low power consumption

Low cost more useful power amplifier using LM386

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The LM386 is a power amplifier designed for use in low voltage consumer applications.

Features

Battery operation
Minimum external parts
Wide supply voltage range: 4V-12V or 5V-18V
Low quiescent current drain: 4mA
Voltage gains from 20 to 200

Stereo preamplifier using LM381

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Low Noise Dual Preamplifier

 The LM381/LM381A is a dual preamplifier for the amplification of low level signals in applications requiring optimum noise performance. Each of the two amplifiers is completely independent, with individual internal power supply decoupler-regulator, providing 120 dB supply rejection and 60 dB channel separation. Other outstanding features include high gain (112 dB), large output voltage swing (VCC - 2V) p-p, and wide power bandwidth (75 kHz, 20 Vp-p). The LM381/LM381A operates from a single supply across the wide range of 9V to 40V.

Features

Low noise - 0.5 µV total input noise
High gain - 112 dB open loop
Single supply operation
Wide supply range 9V-40V
Power supply rejection - 120 dB
Large output voltage swing (VCC - 2V)p-p
Wide bandwidth 15 MHz unity gain
Power bandwidth 75 kHz, 20 Vp-p
Internally compensated
Short circuit protected

TDA 2030 power amplifier

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