| 摘要 |
PURPOSE:To improve initial starting of circuit operation and operation stability, by constituting a feedback circuit between a heat sensitive element and an operation amplifier, and imparting a desired offset voltage in correspondence with the value of the output of the operation amplifier. CONSTITUTION:The output terminal of the operation amplifier 21 is grounded through a resistor 36 and connected to the base of a transistor 39 through a resistor 35. A voltage Vcc is applied to the collector of the transistor 39. A bridge circuit, which controls a hot wire 4 at a constant temperature, is constituted by the hot wire 4, resistors 23 and 25-27, and a thermistor 31. The feedback circuit is constituted by the resistors 33, 35, and 36, the operation amplifier 21, and the transistor 39. The emitter of the transistor 39 outputs the detected output V1 of the hot wire 4, which is cooled by Karman vortex. |
