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... trị điện áp 2/3Vcc Khi ta có U C = Vcc(1 − exp(−t x / R1C )) = / 3Vcc => − exp(−t x / R1C ) = / hay exp(−t x / R1C ) = 1 /3 59 => tx = ln3*R1C = 1.1R1C (*) Dạng xung ta chân 2, 3, Mạch dao động ... thang tụ C3 tương ứng với khoảng thời gian điện áp tụ C3 tăng lượng ∆u tx (chu kỳ dao động tích thoát 1) 66 Khonảg biến thiên điện áp tụ C3 là: Up – UV = N ∆u , N số xung nấc thang tạo tụ C3 Và...