Summary
This paper presents a single chip by the Mega16, ISD4004 voice chip, 7805 and LM317 regulator regulator circuit implementation of a simple voice recorder program.
Through 7805 and LM317 regulator regulator makes the Mega 16 and ISD4004 work, with MIC's voice signal collected through automatic gain control (AGC), amplifier (AMP), filter and a series of amplifiers, the last data stored in the ISD4004 of memory. Through the signal control playback and stop buttons, and finally put through the buzzer sound.
Keywords: Mega 16 microcontroller, ISD4004 voice chip, 7805 regulator, capacitor filter, LM317 regulator, voice recorder, power amplifie