2 x 12W Stereo Amplifier with TDA1521/TDA1521Q

This is a stereo audio amplifier circuit which will deliver 12W audio power output on each channel. This circuit built based on single IC TDA1521 or TDA1521Q, supported with a few external components. General purpose power supply can be used to operate this amplifier circuit, recommended voltage: 24VDC (asymmetrical).

2x12W Stereo Amplifier with TDA1521/TDA1521Q circuit diagram

The TDA1521/TDA1521Q is a dual hi-fi audio power amplifier encapsulated in a 9-lead plastic power package.
The device is especially designed for mains fed applications (e.g. stereo tv sound and stereo radio). A heatsink is required to prevent IC overheating.

TDA1521 Features

  • Requires very few external components
  • Input muted during power-on and off
  • (no switch-on or switch-off clicks)
  • Low offset voltage between output and ground
  • Excellent gain balance between channels
  • Hi-fi according to IEC 268 and DIN 45500
  • Short-circuit-proof
  • Thermally protected

This hi-fi stereo power amplifier is designed for mains fed 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 into an 8 W load with a symmetrical power supply of ± 16 V.

The gain is fixed internally at 30 dB. Internal gain fixing gives low gain spread and very good balance between the amplifiers (0,2 dB). A special feature of this device is a mute circuit which suppresses unwanted input signals during switching on and off.

Download the TDA1521/TDA1521Q Datasheet:


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