11. It is basically similar to the Texas Instruments SN76477 but with internal audio amplifier . 12. Receivers, sharing a common audio amplifier , included a short wave, long wave and beacon. 13. In public address systems or recording devices it is amplified by an audio amplifier . 14. A new class of audio amplifiers based on the PWM principle is becoming popular. 15. In 1997, Nokia sold its car speaker and audio amplifier business to Harman International Industries. 16. The company is best known for its audio amplifiers . 17. Other products include powered subwoofers and car audio amplifiers . 18. Also, it was popular in Soviet era DIY audio amplifiers for hi-fi and musical instruments. 19. This situation is mostly encountered in the interface between an audio amplifier and a loudspeaker. 20. Most modern audio amplifiers are based on tube sound.
