| 摘要 |
PURPOSE:To attain stable operation, by inserting a switch circuit of a positive and a negative constant current circuit of a titled astable multivibrator respectively and switching on/off the switch circuits with an output of an amplifier, for applying a positive or negative voltage in response to the output of the amplifier without floating a feedback constant current source. CONSTITUTION:A positive constant current circuit 15 of the astable multivibrator is connected to an input terminal of the amplifier 11 via a positive voltage source terminal 21 and the switch 22 and a negative constant current circuit 17 is connected to the input terminal of the amplifier 11 via a negative voltage source terminal 23 and the switch 24. The switches 22, 24 are controlled with the output of the amplifier 11, to turn on the switch 22 and off the switch 24 when the output of the amplifier 11 is negative and to turn off the switch 22 and on the switch 24 when the output is positive. Further, a positive feedback loop is constituted with a capacitive element 12, thereby stabilizing the operation of the astable multivibrator without floating the feedback constant power supply. |
