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一、概述 ISD1400系列单片语音录放电路的片内有时钟振荡器、128KE~2PROM(电可编、电可擦除只读存储器)、微音放大器、自动增益制电路、抗干扰滤波器、差动功率放大器等高品质语音录放系统所需的全部基本功能电路。一个最小的录放系统仅由一个驻极体话筒、一个喇叭、二个按钮、一个电源、少量电阻及电容组成。
I. Overview ISD1400 series monolithic voice recording circuit chip oscillator, 128KE ~ 2PROM (electrically programmable, electrically erasable read only memory), micropower amplifier, automatic gain circuit, anti-interference filter, poor Dynamic power amplifier and other high-quality voice recording and recording system required all the basic functions of the circuit. A minimal recording system consists of only one electret microphone, a speaker, two buttons, a power supply, a small amount of resistors and capacitors.