| 摘要 |
PURPOSE:To ensure starting, in an converting device which converts outputs of a veriable capacity type sensor to current, by adding a gate element. CONSTITUTION:An output amplitude controllable alternative current power source 101 is impressed to a differential capacity type sensors 103 and 104, which vary differentially in accordance with quantity of physics to be detected, by controlling it by a differential amplfier 102 as a control circuit. Currents which pass to the sensor 103 and 104 and whose waves are detected by diodes 105-108, are converted by a differential amplifier 122 so as to pass through lines 128 and 129. Cathode of a diode 301 is connected, as a gate element, to a nonreversible input which is given negative feedback of the differential amplifier 102, voltage 302 and 303 which are divided from a power source voltage V are impressed to the nonreversible input as a starting voltage at the time of starting, and thereby an entier device is started. |
