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Charge-to-voltage converters are employed with piezoelectric transducers, e.g. to measure pressures during tests on internal-combustion engines. The requirements imposed on such converters include stability of the zero, the possibility of a static calibration together with a transducer, and operation over a sufficiently wide frequency range. The factors responsible for zero drift in a charge-voltage converter are discussed and analysed. They include imperfect insulation of the gate in the FET V1 of the input stage and of other elements connected to the lead from the piezoelectric transducer (the wires of the connecting cable, the contacts of the connector, etc.); instability of the voltage supply; and the ambient temperature, which changes parameters of the FETs in the input stage.