| 摘要 |
PURPOSE:To reduce the fluctuation of the oscillation frequency to the voltage fluctuation or the like of the DC power source, by actuating the monostable multivibrator with the voltage change of the reference voltage part when the switching circuit operates and then turning on the transistor provided at the time constant circuit part with the output pulse of the monostable multivibrator. CONSTITUTION:Reference voltage part 2 consisting of CR time constant circuit 1 plus resistances R1 and R2 is connected in parallel to DC power source 3; and switching circuit 4 comprising PNP transistor TRQ1 and NPNTRQ2 is provided between circuit 1 and part 2. Then TRQ3 is connected in parallel to capacitor CT of circuit 1, and monostable multivibrator 5 is actuated with the voltage change of part 2 and when circuit 4 operates. And then TRQ3 is turned on with the output pulse of vibrator 5. As a result, the fluctuation of the oscillation frequency can be reduced to the temperature fluctuation as well as to be voltage fluctuation of power source 3. |
