用几块通用型的集成电路,可组成一个触发点可调的施密特触发器,它的触发点可在很宽的范围内进行独立的调节,可正(滞后)、负(超前)或零。如图1所示。图1的电路中,IC_1和IC_2分别由通用型运算放大器组成的两个电压比较器,比较器的阀电压分别由电位器W_1和W_2产生。FF_1和FF_2为两个正跳边响应的D 型触发器。当电压比较器IC_1的输入信号达到U_a 时——U_a 是IC_1的开关点 With a few general-purpose ICs, a Schmitt trigger with adjustable trigger point can be formed. Its trigger point can be independently adjusted over a wide range of positive (hysteresis), negative (advanced) or zero. As shown in Figure 1. In the circuit of Fig. 1, IC_1 and IC_2 are respectively two voltage comparators that are made up of general-purpose operational amplifiers, the voltage of the comparator is produced by potentiometers W_1 and W_2 respectively. FF_1 and FF_2 are D-type flip-flops that respond to two positive edges. When the input signal of the voltage comparator IC_1 reaches U_a - U_a is the switching point of IC_1