单稳态、多稳态、双稳态
多稳态电路也就无稳态电路,1,单稳态是触发后得到一个高电平,延时一段时间后又回到低电平,它保持了一段时间;2,多稳态就是高低电平来回的交替变化。3,斯密特叫双稳态,由低电平通过触发得到高电平,然后再触发又得到低电平,每个状态的变化都需要信号去触发;
通过VT2基极的电压为3.7V,也就是R3,R4分压得到的3.7V这样就可以求出A点的电压为5.55V;
虽然VT4和VT3是同种型号但是性能上总是有少许差别的,假如VT4先导通,假如C4有1V的电压则VT4导通后则C4左侧产生-1V,此时VT3也就截止了,
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