This work with STC89C51 microcontroller as the core a function signal generator is designed. Signal generator with digital waveform synthesis technology, through the combination of hardware circuit and software program, define the waveform, such as sine wave, square wave, triangle wave, sawtooth wave, wave frequency of 100 hz to 10 KHZ to 0 v to 5 v and amplitude can be arbitrary change. Waveform and frequency of change through software control, the amplitude of change through hardware implementation. The output frequency and amplitude can be through the LCD1602 display Can 1 Hz, 10 Hz and 100 Hz and 1000 Hz steps into the signal generator has small volume, low price, the advantages of stable performance,

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信号发生器（频率，波形可调）

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