The P1 port of the single-chip microcomputer is connected to 4 buttons for signal amplitude and frequency adjustment operation keys. The single-chip microcomputer P0, P2.7, P3.6 (-WR) are connected with DA0832 and two 741 (op amps) to form a waveform signal output circuit. The waveform signal output circuit is programmed to output a sine wave signal, and the amplitude and frequency of the signal can be adjusted by the operation keys. The amplitude and frequency adjustment levels range from 0 to 10, a total of 11 levels.
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