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Specification : This is stereo amplifier , based on IC TDA4920 , TDA4925 , TDA4930 . Minimum voltage require 9 volts and maximum voltage 13 volts . Maximum power output 2 x 15 Watts with 4 Ohms impedance. Quiescent current 30 mA. See audio circuit scheematic below :

Application Circuit:  2.1W Audio Power Amplifier Circuit Datasheet for AN7148: Download

This analyst is, a sensitive instrument, in the frequency changes   and width of a acoustic signal. Thus the brightness of LED that turns on each moment of is proportional signal width, while the colour of proportionally frequency. Mini Audio Analyzer Circuit Diagram   . The circuit input sensitivity is regulated with R2, in order that in powerful signals they turn on the red LED , in the middle the yellow LED and in the low green LED . The display unit, is constituted by 3 lines of 10 LED the every, what is checked by a counter decoder (IC2). Two gates ICa-b, function as the IC2, with the R6 regulate the frequency. When does not exist signal in the input, then no one LED does not turn on. As soon as it will be applied signal, then the LED will begin to blink depending on the rythm and the intensity of signal. Can experiment with the prices of resistances R4, R5, so that you find the value that suits in like your. Initially it can they are placed trimmer 1KO, in th...

TDA1566   g eneral description: The TDA1566 is a car audio power amplifier with a complementary output stage realized in BCDMOS. The TDA1566 has two Bridge Tied Load (BTL) output stages and comes in a HSOP24 or DBS27P package. The TDA1566 can be controlled with or without I2C-bus. With I2C-bus control gain settings per channel and diagnostic trigger levels can be selected. Failure conditions as well as load identification can be read with I2C-bus. The load identification detects whether the outputs of a BTL channel are connected with a DC or AC load and discriminates between a speaker load, a line driver load and an open (unconnected) load. The TDA1566 can be configured in a single BTL mode and drive a 1 Ω load. For the single BTL mode it is necessary to connect on the Printed-Circuit Board (PCB) the outputs of both BTL channels in parallel.   TDA1566 Audio Amplifier 2x46W / 1x92W TDA1566  features : Operates in I2C-bus mode and non-I2C-bus mode TH version: four I2C-bus addre...

This circuit use TA7222AP to amplifiers audio signal .The price only $0.99 and can provide 5.8 watt with Muting Control.Power supply can use for 8-12Vdc it is a good idea to use for car audio power amp , coin-op machine game, security system etc. link Fig 1. TA7222AP pin out Pin Name Description 1 Vcc Supply Voltage 2 RR Ripple Reject 3 MC Muting control 4 OP AF Signal Input 5 FB FB Filter 6 GA Gain adjust 7 GND Ground 8 GND Ground 9 OP AF Output 10 BS BootStrap Fig 2. schematic for 5.8 watt audio power amplifier

High Power Audio Amplifier 2800W, Mono power amplifier ouput is 1400Watt / channel. and this circuit is mono power amplifier circuit . See schematic :  Click schematic to view larger See description at source link page Source : High Power Amplifier 2800W

Overview: The AN7171NK and AN7176K are ICs for power amplification of 14W (13.2V, 4Ω) output. It can provide stereo operation since two BTL amplifiers are incorporated in achip. It incorporates various protective circuits, thus providing high reliability. The circuits can be turned on or offwith supply pins energized, because the stand-by circuit is built-in. Circuit Diagram: Dual BTL 14W Audio Power Amplifier Circuits

  *notif : this circuit is stereo power amplifier Although the schematic power amplifier with IC AN7118S is difficult for lees understood making of  PCB track . But once tried to design on PCB is not so difficult. Because the actual components close together and easy to design it. This Circuit need minimum voltage 1 volt and  maximum voltage 3 volt. It is a low voltage amplifier with power output 2 x 35 m Watt . Schematic circuit below : Click to Enlarge Components Required : Resistor / Condensator / Capacitor : 4,7Ohm (2x) , 0,01 uF (2x) , 47uf (2x) , 68 pf (2x) , 1uF (2x) ,  22uF (2x) , 220 uF (1x) , 470uf (2x). Condensator / capacitor voltage use 16 volt. Only Condensator on output speaker use voltage 25 volt.

DC- 2 Audio Amplifier Circuit Diagram . Designs for audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages. One advantage is that there is no need for the complication of a second (symmetric) power supply; another is good frequency and phase response. Also, no special electrolytic capacitors are needed for voltage stabilisation, and switch-on ‘thump’ is much reduced. To try to rescue this class of circuit from obscurity the author has designed a headphone amplifier working along the lines illustrated in Figure 1. . Circuit diagram DC-Coupled Audio Amplifier Circuit Diagram It consists of a voltage divider, a voltage follower and the loudspeaker in the headphones, whose other side is connected to the junction of two electrolytic capacitors, providing the virtual earth. The potential at this point is, of course, half the supply voltage. All we need to do now is suitably couple in the audio signal to be amplified. Fig...

Many electronic projects require the use of a small audio amplifier. Be it a radio transceiver, a digital voice recorder, or an intercom, they all call for an audio amp that is small, cheap, and has enough power to provide adequate loudness to fill a room, without pretending to serve a disco! About one Watt RMS seems to be a convenient size, and this is also about the highest power that a simple amplifier fed from 12V can put into an 8 Ohm speaker. A very low saturation amplifier may go as high up as 2 Watt, but any higher power requires the use of a higher voltage power supply, lower speaker impedance, a bridge circuit, or a combination of those. During my many years building electronic things I have needed small audio amps many times, and have pretty much standardized on a few IC solutions, first and and foremost the LM386, which is small, cheap, and very easy to use. But it does not produce high quality audio... For many applications, the advantages weigh more than the distortion an...

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 hi...

Car Stereo Audio Amplifier with TDA1553CQ Circuit Diagram This is a stereo audio amplifier for your car. The ambit is powered by a distinct IC TDA1553 with some alien components, this IC will handle your stereo car audio system. The TDA1553CQ is a caked chip class-B achievement amplifier in a 13-lead artificial DIL-bent-SIL ability package. It contains 2×22 W amplifiers in BTL configuration. The accessory is primarily developed for car radio applications. Special features of the device are: 3-state mode switch · standby: low supply current (<100> Loudspeaker protection When a short-circuit to ground occurs, which forces a DC voltage across the loudspeaker of >= V, a built-in protection circuit becomes active and limits the DC voltage across the loudspeaker to <= V. Pin 12 detects the status of the protection circuit (e.g. for diagnostic purposes). Short-circuit protection If any output is short-circuited to ground during the standby mode, it becomes impossible to swit...

This circuit uses a switched capacitor filter IC from National Semiconductor to filter signals with frequencies higher than the 3KHz needed for voice audio. The schematic includes an audio amplifier that is designed to drive a standard audio head phone.  The circuit is described in more detail in the receiver section of Dave Johnson's Handbook of Optical Through the Air Communications.(this link is off-site)  3khz Low Pass Filter and Audio Amplifier Circuit Diagram  

Frequently, the sound yield from a laptop's fabricated-in speakers is flat. A capacity intensifier is needed to get an elevated volume. Here is an effortless circuit to intensify the laptop's sound yield.  The circuit is constructed around capacity enhancer IC LA 4440 (IC1) and a few alternate parts. LA4440 is a double channel sound capacity speaker. It has level twisting over a vast run of flat to towering frequencies with exceptional channel detachment. Inbuilt double channels prepare it for stereo and extension speaker provisions. image : http://circuitschematicelectronics.blogspot.com/2011/02/2-x-20-watt-car-amplifier.html In double mode LA4440 gives 6 watts for every divert and in scaffold mode 19-watt yield. It has swell denial of 46 dB. The sound impact might be grasped by utilizing several 6-watt speakers. Associate binds 2, 6 and ground of IC1 to the stereo jack which is to be utilized with the laptop. Collect the circuit on a customary-reason PCB and encase in a suit...

The circuit described here is based on the superior characteristics of dual-gate MOSFET (metal-oxide semiconductor field-effect transistor). It exhibits a very high input impedance that lends for good sensitivity and very less loading of the input signal source. Low cross-modulation characteristic leads to minimal distortion of the output with respect to the input signals. Also, the MOSFET offers low feedback capacitance and high transconductance. All these advantages make the MOSFET the most effective for high-quality mixer and converter applications. This dual-input audio frequency mixer circuit employs a single dual-gate MOSFET 3N200. One may, however, substitute it with any other dual-gate.  MOSFET such as 3N187 and BF966. (It is to be noted that BF966 is not gateprotected and hence calls for suitable precaution in handling it.) The audio frequency (AF) input from the first channel (CH1) is applied on gate 1 (G1) of the MOSFET through 500- kilo-ohm potentiometer VR1. The AF input f...

Circuit Diagram Description The heart of the circuit is TDA7294 which acts as an amplifier the right and left input feded from the pre amplifier circuit is amplified after passing through the noise filter which contains an RC circuit, the volume is controlled by the variable resistor 47k. and the automatic gain control is provided by the operational amplifier circuit opp amp IC249 For both right channel and left channel., the speaker used is an 8 ohms 40 watts speaker.  Source -http://www.electronguide.com/circuits_pages/AudioAmplifier.html

Tiny Audio Amplifier Using LM386 Specifications The Tiny Audio Amplifier kit is a good choice for battery operation. It is based on LM386 IC. Power supply - 6 - 12 VDC Output power - 1 W, 8 Ohm The quiescent power drain is only 24 mW when operating from 6 VDC Self-centering output quiescent voltage Onboard PRESET to adjust volume Terminal pins for connecting power supply, audio signal and speaker Power-On LED indicator ON/OFF PCB mounted slide switch for power supply Four mounting holes of 3.2 mm each PCB dimensions 44 mm x 44 mm Schematic Inputs - Outputs configuration  Parts List  PCB

Features: Built−in Protector Circuits (for surge and thermal, etc.) Built−in Automatic Operating Point Stabilized Circuit Low Distortion, Low L/F Noise Small Transient Nosie at Power ON/OFF Switching Good Channel Separation Few External Components Pin connection: Dual Audio Power Amp 5.3W/Ch. NTE1371 Supply Voltage (Note 1), VCC . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V Peak Supply Voltage (Note 2), VSURGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Total Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4A Power Dissipation (TA = +30°C), PD . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30W Operating Temperature, Topr . . . . . . . .  . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30° to +75°C Storage Temperature Range, Tstg . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . −55° to +150°C

This is an audio power meter simple with this circuit , dual LED starts to light green around 0.1 watts into 8 ohms ( 0.2 watt into 4 ohms ) . Naturally, this depends on the specific type of LED is used. Despite being a simple equipment he is impressively bench since with a load resistor connected to output of speakers is possible to measure the sound level up , or just check its output . Audio Power Meter Circuit Diagram  

This Schematic must use the IC AN7106 because its'nt similarity, and some components. Minimum voltage is 1,8 Volt and Maximum voltage is 4,8 volt . It,s so very low voltage require. Recomended voltage is 3 volt , don't provide voltage too high it can make damage IC. Maximal Output 2 X 0,14 watt , this is stereo amplifier. And impedance is 32 Ohm. See Schematic and package IC AN7106K below : Package IC DIP24 Click Image to view enlarge.  Good Luck !!