一、 555定时器的电路组成P415图8.4.1) Three-resistor C1&C2: voltage divider Voltage comparators (TH) 6 & (TR) (DISC) RS-FF Discharge Tp GND vo VCC RD VCO vI1 (TH) vI2 (TR) vO (DISC) TD ＋ － C1 ＋ － C2 & & & GND vC2 vC1 一、555定时器的电路组成 (P415 图8.4.1) RS-FF C１ &C２: Voltage comparators Discharge TD Three-resistor voltage divider