Variable current transducer system

A system for converting a transducer having a variable output voltage to a current output transducer unit comprising:

• a transducer having a variable voltage output in response to variable input conditions sensed by the transducer;
• voltage regulator means for supplying operating power to said transducer;
• a voltage-to-current converter including an operational amplifier and an output transistor;
• means for applying a reference potential to one input of said operational amplifier;
• means for coupling the output of said transducer to the other input of said operational amplifier;
• said coupling means including first potentiometer means connected between the output of said transducer and the second input of said operational amplifier to control the gain of the system substantially independently of the offset of the current vs. voltage characteristic;
• and
• second potentiometer means connecting the output from said voltage regulator to the junction of said first potentiometer means and said second input to said operational amplifier, to control the offset adjustment of said system, substantially independently of the gain of the current vs. voltage characteristic.

A system for converting a transducer having variable output voltage to a current output transducer unit comprising:

• a transducer having a variable voltage output in response to variable input conditions sensed by the transducer;
• voltage regulator means for supplying operating power to said transducer;
• a voltage-to-current converter including an operational amplifier and an output transistor;
• means for applying a reference potential to one input of said operational amplifier;
• means for coupling the output of said transducer to the other input of said operational amplifier;
• said coupling means including first potentiometer means connected between the output of said transducer and the second input of said operational amplifier to control the gain of the system substantially independently of the offset of the current vs. voltage characteristic;
• second potentiometer means connecting the output from said voltage regulator to the junction of said first potentiometer means and said second input to said operational amplifier, to control the offset adjustment of said system, substantially independently of the gain of the current vs. voltage characteristic, and
• negative feedback circuit means coupled from the output of said transistor to said other input of said operational amplifier.