JPS5582532A - Monostable multivibrator - Google Patents

Abstract

PURPOSE:To enable to obtain the constant duty pulse independently of the periodic variation of input trigger pulse, by controlling the constant current circuit through smoothing the output of integrating means and feeding the output current to the said integrating means. CONSTITUTION:When input trigger pulse is fed to the terminal 11, the switch means 12 is reset, and although the charge of the integrating means 14 is once discharged, while no input trigger pulse is entered, constant current is fed to the integrating means 14 from the constant current circuit 13. The output voltage of the integrating means 14 is of saw tooth shape, this voltage is smoothed with LPF 15 to control the current value of the circuit 13. As a result, the saw tooth waves obtained from the integrating means 14, are equal peak value. When this saw tooth wave and the constant DC voltage from the constant voltage production circuit 18 are fed to the voltage comparator 16, while the DC voltage is in excess of saw tooth voltage, output is obtained from the terminal 17 and the output pulse constant in duty can be obtained independently of the periodic change of the input trigger pulse at the terminal 11.