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Audio signal processing 1 W × 2-channel

Overview: AN12942B is an one-chip IC for the stereo speakers which can output 1 W by 8 Ω, headphone amplifiers, line amplifiers, and electronic volumes. The AGC circuit is built-in to prevent the resonance or the vibration by the speaker’s energy and the clipping distortion what is  called "broken up sound".  Also the AN12942B is built-in power saving on/off function automatically detecting input signal to save the power of speaker  amplifier.
Circuit Diagram:

1 watt audio power amplifier circuit

Circuit diagram:
Datasheet for AN7116: Download

1 W BTL audio amplifier with digital volume control

FEATURES: One pin digital volume control Volume setting with UP/DOWN pulses Flexibility in use Few external components Low saturation voltage of output stage Standby mode controlled by CMOS compatible levels Low standby current No switch-on/switch-off plops High supply voltage ripple rejection Protected against electrostatic discharge Outputs short circuit safe to ground, VP and across the load Thermally protected.
GENERAL DESCRIPTION:
The TDA8551; TDA8551T is a one channel 1 W Bridge-Tied Load (BTL) audio power  amplifier capable of delivering 1 W output power to an 8 Ω load at THD = 10%  using a 5 V power supply. The circuit contains a BTL  power amplifier, a digital volume control and standby/mute  logic. The TDA8551T comes in an 8 pin SO package and  the TDA8551 in a 8 pin DIP package.
Datasheet: TDA8851

1W 2W Audio power IC for notebook PC

General Description: The AN12941A is an amplifier IC for stereo speakers which can output 1 W by 8 Ω or 2 W by 4 Ω. The AGC circuit is built-in to prevent the resonance or the vibration by the speaker's energy and the clipping distortion what is called "broken up sound." of the speakers. Also, to reduce power consumption, AN12941A has a built-in function which automatically detects the 
input signal and can automatically enter power save mode when there is no signal. 

Features:  Speaker amplifier is1 W × 2-channel: 8 Ω, VCC = 5 V or2 W × 2-channel: 4 Ω, VCC = 5 V Built-in AGC circuit Prevention of the resonance or the vibration by the speaker's energy and the clipping distortion of the speaker by AGC at excessive input signal (with AGC on/off switch). Built-in automatic power saving function It detects input signals and switches on/off (with the on/off switch for the automatic power saving). Operating supply voltage: VCC 3.0 V to 5.5 V/ VCC_SP 3.0 V to 5.5 VCircuit Di…

Dual 1-W BTL audio power amplifier

1-W output (8 Ω) with supply voltage of 5 VOn-chip standby functionOn-chip volume functionCircuit Diagram:

1 W BTL mono audio amplifier

GENERAL DESCRIPTION
The TDA7052 is a mono output amplifier in a 8-lead dual-in-line (DIL) plastic package. The device is designed for battery-fed portable audio applications.
Features:
No external componentsNo switch-on or switch-off clicksGood overall stabilityLow power consumptionNo external heatsink requiredShort-circuit proofCircuit Diagram