| 摘要 |
PURPOSE:To suppress the deterioration in characteristics, by providing an impedance converter circuit to the post-stage of the detector circuit connected to an org. polymeric humidity detecting element. CONSTITUTION:An org. polymeric humidity detecting element 9 is connected to an oscillator circuit 7 using a single power source through a condenser 8 and the signal of a smoothing circuit 11 connected to the element 9 through an emitter follower circuit 10 is inputted to an air conditioner control circuit 12. In this case, both functions of a detector circuit and an impedance converter circuit are imparted to the circuit 10 and input impedance looked from a base side is made high to reduce a base current and the ratio of the positive and negative sides of an AC current flowing to the element 9 is made the same. By this method, ion polarization can be suppressed. |
