ISD1820 is a small Voice Recorder and Playback module that can do the multi-segment recording. The user can achieve a high quality of recording (for 8 to 20secs) for each application with the adjustment of the on-board resistor.
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.