Hi,
I am trying to interface a pressure sensor with 4-20 mA output with an ADC. So I have to convert this current to voltage.
But the problem is that I have a single supply of 5V and I want to use LM358 single supply OP-AMP for this conversion. I successfully implemented the circuit using dual supply(+5V and -5V) in inverting amplifier mode, but I was unable to implement using single supply(+5V).
Please suggest how to implement the same circuit in non-inverting mode, so that I can convert this 4-20 mA to +ve voltage.
Thank you.
Current To Voltage Converter Ic
A device that produces a voltage proportional to the input signal current is called a current to voltage converter.In this circuit, a photocell or photo multiplier tube that provides output current proportional to the light flux but independent of the load impedance, is connected to the inverting input terminal of the op-amp. R s is the shunt source resistance, as there is a virtual ground at. Current in a series circuit is absolutely equal at all points in that circuit regardless of wiring resistance, whereas voltage in a parallel-connected circuit may vary from end to end because of wire resistance, making current-signaling more accurate from the “transmitting” to the “receiving” instrument. How to Transform the Passive Current-to-Voltage Converter into an Active One (Reinventing the Op-amp Inverting Current-to-Voltage Converter) Circuit idea: The op-amp compensates the internal losses caused by the resistor adding as much voltage to the input voltage source as it loses across the resistor.
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