Stereo Power Amplifier STA550

Stereo Power Amplifier 2x70Watt STA550 is chip audio power with BASH concept that can be connected with digital devices. 2x70Watt STA550 Stereo Power Amplifier is an amplifier with BTL system with symmetrical power supply with ground. Power amplifier STA550 uses power output transistor which is on the chip and is set to produce a high efficiency audio power. Power output on the STA550 is using the system without copling ac bridge (direct) and zero offset.

Strengthening of the STA550 from stereo power amplifier is +12 dB. 2x70Watt STA550 Stereo Power Amplifier is equipped with temperature sensors for protection from overheating and current-limiting protection system for power amplifier. 2x70Watt STA550 Stereo Power Amplifier is equipped with standby and mute controls to regulate silent or active mode power amplifier.

    Feature :

•      Monochip Bridge Stereo Amplifier with Bash ® Architecture

•      55 +55 w Output Power @ Rl = 4 / 8 W, THD = 0.5%

•      70 +70 w Output Power @ Rl = 4 / 8 W, THD = 10%

•      High Dynamic preamplifier Input Stages

•      Programmable External Feedback Type Compressors

•      AC Coupled Input Output Bridge To Class Ab Amplifier

•     Precision Rectifiers To Drive The Digital Converter

•      Proportional Over Power Output Current Limit To The Digital Converter

•      Absolute Power Transistor Bridge Output Power Protection

•      Absolute Output Current Limit

•      Integrated Thermal Protection

•      Power Supply Over-Voltage Protection Flexiwatt With 27 Pin Power Package

•      Bash ® Licence Require
  

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Car Stereo Booster with LM2896

Car Stereo Booster with LM2896This car stereo booster uses an LM2896 IC which has two integrated amplifiers. It can be powered with voltages up to 15 volts. The power output is 2.5 watts per channel with an 8 Ω load and supply voltage of 12 volts. Using the bridge tehnique in the circuit gives a power output of 9 watts. The car audio booster can be powered up from 3 up to 15 volts.
Car stereo booster circuit diagram

The load impedance that can be connected at its output can be either 4 Ω or 8 Ω. The supply voltage and the load impedance influence the output power level. This amplifier circuit is designed as a booster for auto radio/cassette players. The current consumption by maximum power output and a 4 Ω load is 1 ampere.

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High efficiency stereo Class D audio amplifier

The SSM2380 is a fully integrated, high efficiency, stereo Class-D audio amplifier designed for mobile phone applications , mp3 players and other audio applications that require low output power . This class D audio amplifier  circuit requires few external components and operates from a single 2.5 V to 5.5 V supply.

SSM2380 audio amplifier  circuit is capable of delivering 2 W of continuous output power with <1% THD + N driving a 4 ohms load from a 5.0 V supply, or 1.4 watts of continuous output power on a 8 ohms load  .

The SSM2380 features a highly flexible I2C interface with many useful settings. Using the I2C control interface, the gain of SSM2380 can be selected from 1dB to 24 dB + Mute in 47 steps with no external components Other features accessed from the I2C interface are: independent L/R channel shutdown, variable ultra-low EMI emission control mode, Automatic Level Control (ALC) for high quality speaker protection, and Stereo-to-Mono mixing operation.

The SSM2380 features a high efficiency, low noise modulation scheme that requires no external LC output filters.

It operates with 93% efficiency at 1.4 W into 8 ohms or 85% efficiency at 2W into 4 ohms from a 5.0 V supply and has an SNR of >100 dB.

Main features of the SSM2380 audio amplifier are : highly configurable I2C interface , stereo amplifier configuration , stereo-to-mono mixer option via I2C control , 93% efficiency at 5.0 V, 1.4 W into 8 ohms speaker , >100 dB signal-to-noise ratio (SNR) , single-supply operation from 2.5 V to 5.5 V , 20 nA ultralow shutdown current , short-circuit and thermal protection , pop-and-click suppression.

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Quality Stereo Wireless Microphone or Audio Link

Quality Stereo Wireless Microphone or Audio Link. This stereo FM wireless microphone also makes a great quality audio link. We tested it to beyond 50 meters and it was rock solid. It’s certainly not the first wireless microphone we’ve ever published but this one is a little different. It’s stereo, providing surprisingly good quality sound. Second, it has a really good range. We tested it at well over 50m and it was still performing very well – noise-free, in fact – but at the time we couldn’t get our receiver any further away. So it’s likely to have even better range than that.

Complete Project:

Its easy to build, requires very little setup... and its cheap! In fact, the low price might turn some people off, thinking its low quality. Try it - and be pleasantly surprised!

Third, it really is simple to build – the hard work (the transmitter module) is already done for you. It’s just a matter of assembling the microphone module, which contains the electret mics themselves, preamp and level controls, and soldering the transmitter module onto it, "piggy back" style.

FM Transmitter:

Finally, the transmitter module is crystal-locked, so you won’t have the drift probles of some earlier wireless microphones. And just in case you were wondering, that doesn’t mean the output is locked to one particular frequency – it has a nifty synthesis schema built in to give you the choice of seven different frequencies between 106.7MHz and 107.7MHz.

On-board preset pots adjust the sensitivity of each channel to take into account mic differences or if you require different levels in each channel.

By the way, the transmitter module is quite capable of operating at line level if you want just a line level transmitter (eg, to feed an audio program around your home). Sensitivity is about 100mV. Oatley Electronics, who designed the kit, have the transmitter module available by itself if that’s what you’re after. But more on that anon.

Parts Layout:

You also have the choice of two power supply levels – 3-6V or 7-15V DC. The latter results in a lower current drain. The transmitter module also has a "5V out" rail to supply power to the preamp module.

Quality Stereo Wireless Microphone Circuit Diagram:

Two electret microphone inserts are supplied in the kit. These can be soldered direct to the PC board to make it a fully self-contained project or they can be attached to the board via suitable lengths of mini shielded coax cable. A third option is to use "proper" microphones – they can be electret or dynamic types – but no provision has been made for plugging these in.

Typical Specifications:
Audio response:.....................20Hz-15kHz.
Channel separation: ........................40dB
Total Harmonic Distortion: ...............0.1%
Output Frequency:...........106.7-107.2MHz
Pre Emphasis: ..................................50μS
DC supply voltage range: ................3-15V
Supply Current: .......................30mA @ 9V

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20W Stereo Amplifier Wiring diagram Schematic

The 20-W + 20-W Stereo Amplifier Circuit Diagram consists of two complete, separate 20-W RMS bridge-type amplifiers. The input signal source is brought into the amplifier through the voltage divider network, which is made up of Rl, R2, and PI. Resistor Rl provides a load impedance between the signal source and ground. Resistor R2 couples that signal to potentiometer PI.The signal is coupled by capacitor CI to the noninverting (+) input (pin 1) of internal amplifier (A) of IC1, where the signal is greatly amplified. Capacitor C2 couples the (+) input of the other (B) internal amplifier of IC1 to ground. 

That causes the input signal, which is referenced to ground, to be coupled to both amplifiers because both the inputs and outputs of IC1 (A) and IC1 (B) are connected in a bridge configuration. Notice that the output of IC1 (A) from pin 10 is connected to one side of the speaker and the output of IC1 (B) from pin 8 is connected to the other side of the speaker.

 20W Stereo Amplifier Circuit Diagram

That is why the speakers used cannot have one side connected to ground. Resistors R6 and R7 set the gain of the amplifier. Resistors R9 and R10 and capacitors C9 and C10 provide frequency stability and prevent oscillation. Capacitors C6 and C7 provide bootstrapping, which prevents distortion at low frequencies. LED LI lights up by way of a series resistor connected from the anode to +12 Vdc when power is applied.Power for both IC1 and IC2 is brought in through D1 (to protect amplifiers from reverse polarity). Capacitor Cll provides additional power supply line filtering. This booster is capable of producing 20 W RMS output out of each channel.

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Stereo Headphone Amplifier

Circuit Skema Rangkaian - LM4910 belonging to the Boomer series of National Semiconductors is an integrated stereo amplifier primarily intended for stereo headphone applications. The IC can be operated from 3.3V ans its can deliver 0.35mW output power into a 32 ohm load. The LM4910 has very low distortion ( less than 1%) and the shutdown current is less than 1uA. This low shut down current makes it suitable for battery operated applications. The IC is so designed that there is no need of the output coupling capacitors, half supply by-pass capacitors and bootstrap capacitors. Other features of the IC are turn ON/OFF click elimination, externally programmable gain etc.

Stereo Headphone Amplifier

Circuit diagram of the LM4910 stereo headphone amplifier is shown above.C1 and C2 are the input DC decoupling capacitors for the left and right input channels. R1 and R2 are the respective input resistors. R3 is the feed back resistor for left channel while R4 is the feed back resistor for the right channel. C3 is the power supply filter capacitor. The feedback resistors also sets the closed loop gain in conjunction with the corresponding input resistors.

Notes.

• The IC is available only in SMD packages and care must be taken while soldering.
• The circuit can be powered from anything between 2.2V to 5V DC.
• The load can be a 32 ohm headphone.
• Absolute maximum supply voltage is 6V and anything above it will destroy the IC.
• A logic low voltage at the shutdown pins shut downs the IC and a logic high voltage at the same pin activates the IC.

source : ExtremeCircuits

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LA3161 Stereo Preamplifier Circuit

LA3161 is an integrated 2 channel pre-amplifier meant for car stereo applications. The LA3161 contains a built in voltage regulator that plays an excellent role in improving ripple rejection . The IC needs minimum number of external components and the noise level is extremely low. The IC has high input impedance (around 100K) and is available in an 8 pin SIL package.

In the circuit each of the built in amplifier section are used. Capacitors C8 and C9 are input coupling capacitors. Capacitors C3 & C6 are noise filter capacitors. The lower cut-off frequency depends on the value of C3 and C6 network comprising of components R1, R2 & C1 defines the frequency characteristics of left channel and the network consisting of R3, R4 &C2 defines the frequency characteristics of the correct channel. C4 and C5 are output coupling capacitors. C7 is the power supply filter capacitor and it should be connected as close as possible to the power input pin (pin 4) of the IC. This IC doesn’t have short circuit protection, and short between pins may cause damage. C10 and C11 are meant for preventing radio interference, interference from engines etc.

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FM adaptor circuit for car stereo

With this compact FM adapter schema plugged into the audio out of your cassete player or i Pod out put,you can listen your favorite music on your car stereo.This schema is very useful if your car stereo does not have an auxiliary in socket.The schema is nothing buy an short range FM transmitter.





The FM transmitter schema is based on low power NPN transistor 2N2222.The tank schema consisting of L1 & C1 produces the necessary oscillations at the collector of Q1.The capacitance C4 , resistance R3 & R4 performs the function of mixing the stereo out put from the audio player or i-Pod.The emitter resistance R2 provides sufficient stability to the schema.It also limits the collector current to increase the battery life.



Notes.

* Use a 28SWG , 10 cm insulated copper wire as antenna.
* For L1.make 8 turns of 20 SWG insulated copper wire on a 5mm dia plastic former.
* Power the schema from a 3V battery.
* Assemble the schema on a good quality PCB or common board.
* C1 can be a 50pF trimmer.

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Kenwood Car Stereo Car Audio

Kenwood Car Stereo Lets You Listen To The Future Of Car Audio. - This brand is a household name for every car audio enthusiast. Mention the name Kenwood car stereo and they will know what you’re talking about. 

Kenwood car stereos have produced high quality consumer electronics, test equipment and communication equipment since 1946. Kenwood car stereos primarily specialize in the design, engineering and manufacture of wireless communication infrastructure but are also renowned in the production consumer mobile and home entertainment systems. Kenwood car stereos are also committed to creating the finest quality components with state of the art technologies that has earned them a huge following in the audio products scene.

At present, Kenwood car stereos have a very impressive product lineup that would make anyone drool over, whether he is an audio enthusiast or not. For the regular Joe who isn’t really into technical stuff, and is just looking for something nice to put into his ride, Kenwood car stereos offer sleek designs that will surely satisfy anyone’s craving for aesthetic. Tech-freaks and geeks will also be impressed with the specs a Kenwood car stereo has.  

A lot of Kenwood car stereo units nowadays include popup LCD panels for watching VCD/DVD movies. The Kenwood KVT-717DVD 7.0” Wide, Fully Motorized In-dash Monitor DVD/WMA/MP3 Receiver is a good candidate for any situation. 

• 7.0 inch Wide Color TFT Active Matrix Display

• Full-automatic Open/Close with slide and angle adjustments

• Interactive Touchscreen Control with OSD

• Audio Easy Control Mode while Playing Visual Source

• Selectable Wall Paper (6 Patterns)

• Installer/Backup Memory of Audio/Video Setup

• Maximum Output Power : 50W x 4 (MOSFET Power IC)

• 3 Preouts with 5V Pre-out Level

• 2 RCA AV Inputs / 1 RCA AV Output

• Video Input for Rear View Camera

• RGB Input for Navigation System

• System Q/ System Es+

• DVD Menu Direct Touch screen Control

• MPEG 1/2 Video files (.mpg) and JPEG files (.jpg) Playback

• Dual Zone Source & Volume Control

• DVD±R/RW Compatible

• External Media Control — iPod Ready

• Optional TV Tuner 

For those who might not get what the hell all of these means, just imagine this: a really thin monitor panel that smoothly retracts and extends at the push of a remote, crystal clear movie and picture playback, all encased in a beautiful black matte finish polymer casing done with a space age design. 

If all you want is a just a regular car stereo for playing CDs’, listening to mp3s or the radio, Kenwood car stereo have a lot to choose from. A good head unit would be the KDC-MP928 AAC/WMA/MP3/ CD Receiver with External Media Control. 

• Auto-Slide Detachable Faceplate

• Rotary Encoder & Jog Control Knob for Easy Operation

• 4096 Color OEL Display

• Display Customize Function

• Maximum Output Power : 50W x 4 (MOSFET Power IC)

• ACDrive (Advanced Codec Drive)

• AAC/WMA/MP3 Playback

• G-Analyzer (Graphic Motion Analyzer)

• Built-in DSP : DTA/System Q(4band P-EQ)/Digital Es/SRS

WOW Digital Effect

• O.D.D. (Offset Dual Differential) D/A System for Sound Quality

• Installer/User/Backup Memory of Audio Setup

• SIRIUS Satellite Radio Ready

• HD Radio Ready

• External Media Control — iPod Ready

• Dual Zone Source & Volume Control

• AUX Input

• Gold Plated 3 Preouts with 5V Pre-output Level

The Kenwood car stereo auto slide detachable faceplate allows you to take the faceplate (one which has all the buttons) in order to prevent theft by taking away the functionality of the unit left in the car. 

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