The TDA2003 is an Audio Amplifier IC from ST Microelectronics with a maximum output power of 10W commonly used in stereo amplification in car Radio. The IC can output a maximum current of 3.5A and features very low harmonic and crossover distortion.
The PT2399 is an Echo Processor IC that is commonly used to provide digital delay in audio circuits. The IC takes in analog audio input and converts it into digital stream of bits to add a digital delay to it.
The TDA7279 is a 15W + 15W Stereo dual bridge Amplifier. It is 15 Pin class AB type amplifiers and has an operating voltage from 6V to 18V. It is typically operated at 12V in portable battery powered audio applications like Radio, Bluetooth speakers etc..
TDA7265 is a 25 Watt + 25 Watt stereo audio amplifier IC. The chip is a class AB dual audio power amplifier in Multiwatt package specifically designed for high quality sound application as music centers and stereo TV sets.
TDA2005 is a 20 Watt audio amplifier IC, a class B dual audio power amplifier in Multiwatt11 package specifically designed for car radio applications. Because of high current capability (up to 3.5Amp) the chip can be used to design Power booster amplifiers easily.