斯密特触发器便于将正弦波变换为方波。然而若正弦波失真,则方波也会失真。但只要加以适当反馈,用斯密特触发器就能产生对称的方波输出,而且不论正弦波失真与否,均不需调整。此电路采用具有正反馈的基本斯密特电路,如图1所示。晶体管Q_1和Q_2组成普通的斯密特触发器,Q_3 Schmitt trigger to facilitate the sine wave into a square wave. However, if the sine wave distortion, the square wave will be distorted. However, with proper feedback, a symmetrical square-wave output can be generated with a Schmitt trigger and no adjustment is required, regardless of whether the sine wave is distorted or not. This circuit uses a basic Schmitt circuit with positive feedback, as shown in Figure 1. Transistors Q_1 and Q_2 make up ordinary Schmitt trigger, Q_3