| 摘要 |
An electrostatically-capacitively acting detection circuit is used for converting a mechanical adjustment into a rectified signal. For this purpose, a series circuit consisting of a capacitor (12) changing its capacitance as a function of the adjustment, a voltage of an oscillator (11), and a resistor (13) and a reference voltage source (15) is provided. The alternating voltage occurring across the resistor (13) is converted into a direct voltage by means of a rectifier circuit (14) and then compared with the reference voltage (15) by means of a comparator circuit (16). The output variable of the comparator circuit (16) is supplied to the oscillator (11) to keep the direct voltage at the same amplitude as the reference voltage (15). Furthermore, the oscillator (11) has another output for an output variable which, after rectification, forms the signal corresponding to the adjustment. <IMAGE>
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