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Troubleshooting a Pressure Transmitter Circuit.

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airisha

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I have implemented the circuit of pressure transmitter in LTSPICE. The goal is to get 4 to 20mA output through the load resistance with the variation in differential capacitor(sensing element). But the circuit is not operating exactly as required. I am attaching the circuit diagram and the LTSPICE circuit. Please help to get the desired results. More information can be provided if required.
 

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