A stereo audio amplifier circuit sharing

This is a stereo audio amplifier circuit that will provide 12W of audio power output on each channel. The circuit is built on a single IC TDA1521 or TDA1521Q and supports a small number of external components. A universal power supply can be used to operate this amplifier circuit, recommended voltage: 24VDC (asymmetrical).

The TDA1521/TDA1521Q is a dual high-fidelity audio power amplifier in a 9-pin plastic power package.

This device is designed for powering applications such as stereo TV sound and stereo radio. A heat sink is required to protect the IC from overheating.

TDA1521 Features

Requires few external components

Input mute on power on and off

(no on or off click)

Low offset voltage between output and ground

Excellent gain balance between channels

Hi-Fi speakers according to IEC 268 and DIN 45500

Short circuit protection

Thermal protection

This Hi-Fi Stereo Power Amplifier is designed for mains powered applications. The circuit is designed for both symmetrical and asymmetrical power supply systems. An output power of 2 x 12 Watts (THD = 0,5%) can be delivered to an 8 W load with a symmetrical power supply of ? 16 Volts.

The gain is internally fixed at 30 dB. The internal gain fixing provides low gain extension and very good balance (0, 2 dB) between the amplifiers. A special feature of the device is the mute circuit which suppresses unwanted input signals during switch-on and switch-off.