本设计思路给出一种制作简单而 通用的稳定频率合成器(正弦波 和方波)的方法。电路的核心是AD9850 DDS芯片(见图)。合成器由 PC的打印机口(大多数情况下,该口的地址是0x378)控制。 程序是人-机对话的。将要求你输入的值有:最低和最高频率,点数(高达30000)和各点之间的延迟(1ms增量)。合成器提供连续的扫描——从一点“转换”到另一点,从最低频率“转移”到最高频率,直到按下任意一键为止。按“n”健将返回到DOS;任何其他键将提醒你输入新的参数。 对于单频发生器,只要输入相同的 This design idea gives a way to make simple and versatile stable frequency synthesizers (sine and square). The core of the circuit is the AD9850 DDS chip (see picture). Synthesizer by the PC’s printer port (in most cases, the mouth of the address is 0x378) control. The program is human-machine dialogue. The values ​​you will be asked to enter are: minimum and maximum frequency, number of points (up to 30,000) and delay between points (1 ms increments). The synthesizer provides continuous scanning - from one “transition” to another, “shifting” from the lowest frequency to the highest frequency, until any one of the keys is pressed. Press “n” to return to DOS; any other key will remind you to enter new parameters. For single frequency generators, just enter the same