PURPOSE: To decrease the number of the elements and then eliminate the effect not only by the fluctuation of the power supply voltage but by the change of temperature, by providing the DC level shifting function within the oscillating circuit.
CONSTITUTION: The resistances R26 eliminates the offset of the base voltage of the transistors Q22∼Q25 which constitute the differential amplifier. The transistor Q29 feeds the oscillation output back to the transistor Q25, and then constitutes a part of the pulse driving circuit which possesses the DC level shifting function to drive the transistor Q31 along with the resistance R28 and the transistor Q30. And a part of the oscillator which supplies the base voltage of the transistor Q21, the resistances R21 and R22, the diode D21 plus the transistor Q22 is constituted.
NAGAO NOBUYA
OGIWARA YUTAKA
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