USB Powered mini Amplifier


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Drive multimedia speakers for PC with single-chip-based Amplifier.usb-mini-amplifier

Low-voltage, compatibility with USB power, easy heat-sinking, low cost, high flexibility and wide temperature tolerance... TDA 2822. [PDF]

The heart of the circuit is IC TDA2822M Monolithic Amplifier IC
in 8-lead DIP package.

TDA2822 MIt is intended for use as a dual audio power amplifier in battery-powered sound players. Specifications of TDA2822M are low quiescent current, low crossover distortion, supply voltage down to 1.8 volts and minimum output power of around 450 mW/channel with 4-ohm loudspeaker at 5V DC supply input.

An ideal power amplifier can be simply defined as a circuit that can deliver audio power into external loads without generating significant signal distortion and without consuming excessive quiescent current.

This circuit is powered by 5V DC supply available from the USB port of the PC.

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USB Amp PCB

Audio signals from the PC audio socket/headphone socket are fed to the amplifier circuit through components R2 and C2 (left channel), and R3 and C3 (right channel).

USB Powered mini AmplifierUSB Powered Audio Power Amplifier Circuit Diagram

Potenciometer VR1 works as the volume controller for left (L) channel and potmeter VR2 works for right (R) channel. Pin 7 of TDA2822M receives the left-channel sound signals and pin 6 receives the right-channel signals through VR1 and VR2, respectively. Amplified signals for driving the left and right loudspeakers are available at pins 1 and 3 of IC1.

USB Amp TDA2822M PCB Layout

Assemble the circuit on a medium-size, general-purpose PCB
Use a socket for IC TDA2822M...

Miniature Audio Amp
Or Assemble it on PCB.



Author: T.K. Hareendran - Copyright: EFY Mag



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