PURPOSE:To ensure an output of the stable frequency of oscillation, by longitudinally connecting an inverter between an input and an output and then installing a series electrostatic capacitor between the 1st and 2nd inverters plus a constant value current limiting circuit between the input and the output of the 2nd inverter. CONSTITUTION:A capacitor C1 is put into the area between the output of an inverter (INV) G1 having a longitudinal connection secured between the input and the output and the input of an INVG2. Furthermore a constant value current limiting circuit CC is connected between the input and the output of the INVG2. The frequency of oscillation of a free-running multivibrator having such constitution is decided by only the capacitor C1, the power supply voltage E and the current of the circuit CC. Accordingly the C1 is selected to decide the frequency of oscillation, by stabilizing the voltage E. Thus the effect to the frequency of oscillation due to the fluctuation of distribution capacities CGS1 and CGS2 plus the threshold level with which the output of the INVG2 is inverted can be prevented.
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