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Patent
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G01L 9/12 (2006.01) G01L 9/00 (2006.01) G01R 17/00 (2006.01) G08C 19/02 (2006.01) H03F 3/45 (2006.01)
Patent
CA 1227663
VARIABLE CURRENT TRANSDUCER SYSTEM Abstract of the Disclosure A pressure or other transducer having a normal variable voltage output is converted to a unit having a variable current output in response to the normal output voltage with the minimum current drawn by the unit being only slightly greater than that required to operate the basic voltage-type transducer. The new current output system includes a voltage regulator and a voltage-to- current converter. The voltage-to-current converter includes an operational amplifier and an output tran- sistor, with one input to the operational amplifier being set at a voltage equal to the output voltage of the voltage-type pressure transducer at zero pressure. The output from the voltage-type pressure transducer is connected through a first gain adjusting potentiometer to the second input of the operational amplifier; and an additional offset adjustment potentiometer is connected between the output of the voltage regulator and the junction between the gain adjustment potentiometer and the second input to the operational amplifier. The voltage regulator and the voltage-to-current converter may both include output buffering transistors. Where the voltage-type pressure transducer draws about 3.5 milli- amperes, the minimum current from the entire system is only about 4 milliamperes, and may even be set below 4 milliamperes.
479771
Kavli Tom O.
Park Kyong
Kavlico Corporation
Smart & Biggar
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