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Recent content by Switcher

  1. S

    preferred value of Rf and R1 resistances for inverting OPAMP buffer

    This question was asked by my friend's prof.: While designing an opamp inverting buffer what must be the preferred value of Rf and R1 resistors: Rf=R1 = 1R OR Rf=R1 = 1k OR Rf=R1 = 1M ?
  2. S

    4-20mA to 0-3.3V current to voltage conversion

    Thanks Skyguy. I need an accurate design but rcv420 is too complicated and coslty. A V to I converter is not the only thing in my circuit. I have taken points from it though which I will use.
  3. S

    4-20mA to 0-3.3V current to voltage conversion

    Thanks.good idea. But wouldn't a buffer stage after the 165R resistor still be necessary?
  4. S

    4-20mA to 0-3.3V current to voltage conversion

    @FvM: got your point. How did you infer input common mode range to be 0.6V from the datasheet? I have to look at the Maximum peak output voltage swing and the input common mode voltage range, right? Any compensation required for LM358? MCP6002 has lesser input bias current and offset voltage...
  5. S

    4-20mA to 0-3.3V current to voltage conversion

    Thank you guys I don't have LM334 right now. For a quick test, using a variable resistor in series with the 165R drawn from an isolated 24V. How accurate will the results be?
  6. S

    4-20mA to 0-3.3V current to voltage conversion

    Thank you Esp1. Just to confirm what you said: 1) The circuit will work if I use a rail to rail OPAMP like MCP6002. Rather, can I use the same OPAMP (TL062) if I supply 5V and GND ? (Vref being 3.3V and rest of circuit remaining same) 2)To test on a breadboard, I can use an independent 24V dc...
  7. S

    4-20mA to 0-3.3V current to voltage conversion

    Hi guys,Need your help: An application requires me to convert 4-20 mA current signal from a pressurre transmitter to 0 to 3.3V signal for ADC of uC. 1) I have worked out a circuit (attachment). What are your views on this? Would it work? I am using opamp TL062, but giving it a unipolar single...
  8. S

    4-20mA to 0-3.3V current to voltage conversion

    @Yolco, Schmitt trigger: Need your help 1) I am trying a similar circuit. What are your views on this. Would it work? (My main circuit has 3.3V dc) 2) To test this circuit on a breadboard, I do not have a transducer right now. What is a simple and effective way to make an Adjustable Constant...
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