【555振荡电路】555多谐振荡电路的周期计算公式是多少?
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解决时间 2021-02-05 19:15
- 提问者网友：骑士
- 2021-02-05 14:17
【555振荡电路】555多谐振荡电路的周期计算公式是多少?
最佳答案
- 五星知识达人网友：鱼忧
- 2021-02-05 15:06
【答案】 f = 1 / T = 1.44 / (R1 + 2R2)*C
追答： The external capacitor charges through R1 + R2 and discharges through R2. Thus the duty cycle may be precisely set by the ratio of these two resistors. The capacitor C charges and discharges between 1/3 VCC and 2/3 VCC. The charge time (output high) is given by: t1 = 0.693 (R1 + R2) C And the discharge time (output low) by: t2 = 0.693 (R2) C Thus the total period is: T = t1 + t2 = 0.693 (R1 +2R2) C The frequency of oscillation is: f = 1 / T = 1.44 / (R1 + 2R2)*C
追答： The external capacitor charges through R1 + R2 and discharges through R2. Thus the duty cycle may be precisely set by the ratio of these two resistors. The capacitor C charges and discharges between 1/3 VCC and 2/3 VCC. The charge time (output high) is given by: t1 = 0.693 (R1 + R2) C And the discharge time (output low) by: t2 = 0.693 (R2) C Thus the total period is: T = t1 + t2 = 0.693 (R1 +2R2) C The frequency of oscillation is: f = 1 / T = 1.44 / (R1 + 2R2)*C
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- 1楼网友：荒野風
- 2021-02-05 15:39
对的，就是这个意思
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