The LM380 is a 2.5W power audio amplifier for consumer applications. In order to hold system costs to a minimum, the gain is internally fixed at 34 dB. The output of LM380 is short circuit proof with internal thermal limiting.
The LM1875 is a Class-AB Audio Amplifier from Texas Instruments. It can deliver an output power of 20W into a 4Ω or 8Ω speaker with a maximum current of 4A. The IC can operate in single rail or dual rail power supply and is commonly used in high power audio amplifier designs.
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.