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Related Posts

  • Forum Post: Re: LM339 as comparator

    Deepak Bansal
    Hi, I have now used two TLV3401. Below is the schematic: Problem is when no current flows U2 is high but U1 gives o/p low. I don't understand why this happens? I checked voltage at inv & non-inv terminal of U1, volatges are same. Then why there is error? When volatges at terminals...
    on Jan 7, 2012

  • Forum Post: Mistakes in "Op Amps for Everyone" noise section?

    Jonathan9420
    In Op Amps for Everyone , there's a section on noise calculations "Op Amp Noise Theory and Applications" which is hard for me to follow. I see a few obvious errors, so I wonder if this section is just wrong. Can someone go through each of these and confirm if the book is wrong or explain...
    on Jan 8, 2012

  • Forum Post: LM2902 input impedance

    Mike, Jung
    Hello I wonder the input impedance LM2902. Now, Vin(+)/(-) = 0.45V, Vout = 4.7V, Vcc = 6.8V LED is in front of FET drain. Inverting input is 750 resistor, but non inverting input isn't. I test this circuit inserting the inverting 1K resistor. The result is Vin(+)/(-) = 0.46V...
    on Jan 16, 2012

  • Forum Post: output impedance of LMV342

    Hiroshi Sato
    Our customer trying to design an sensing circuit with LMV342 as below. They want to know the output impedance of this circuit and LMV342 itself. I think the the output impedance of this circuit is 100Ohm, but I can't find the output impedance of LMV342 in the datasheet. Please let me know...
    on Jan 17, 2012

  • Forum Post: Differential ideal voltage zero in opamp

    Aamir Ali
    Hi everyone, I was reading basics of opamps & read that diff voltage is ideally zero. So that voltage at inverting terminal(v1) is equal to non-inverting terminal(v2) ideally. (mostly in all derivation this has been done). i.e v1=v2. But if I apply volatge at V1 only & ground v2 to use as...
    on Jan 21, 2012

  • Forum Post: step down (10V-3.6V)

    sanjeev kumar87916
    Hi all, I want to convert 10V,4-20mA,50Hz analog signal to 3.6V. IF i am not wrong, we can achieve this in 3-ways. 1) By using voltage divider circuit 2) By using OP-AMP 3)By using voltage compression Diode. Please suggest me which one will be a good Practice and if possible please...
    on Jan 24, 2012

  • Forum Post: Re: Differential ideal voltage zero in opamp

    Aamir Ali
    Bruce, ->. In case of opamp as comparator,(besides it drawbacks), does that mean v1 not equal to v2. So what about vid now. As I have read vid = Vout/A. A being very large, vid ~=0. Isn't it contradiction b/w two points. ->. Even in differential opamp with feedback, Vo= (-Rf...
    on Jan 24, 2012

  • Forum Post: 5v to 15v

    sanjeev kumar87916
    Hi all, I want to bust 5V analog signal to 15V and should have 200mA DRIVING CAPABILITY. Please help me BR Sanjeev Kumar
    on Jan 25, 2012

  • Forum Post: Op amp temp sensor

    Hithesh
    I am trying to understand a temp sensor ckt in TI app note AN56. I have attached the app note ckt and my simplified ckt. So the sensor has a constant voltage bias. Vbe will be something around 0.65v at zero C. To make the output of the opamp zero, another reference but with opposite polarity is...
    on Mar 16, 2012

  • Forum Post: Using OpAmp as attenuator

    Naji Naufel
    Is there an OpAmp and circuit diagram that will allow me to attenuate a 0-10V signal to a 0-2.5V output before feeding it into an ADC? Thank you
    on Mar 22, 2012

  • Forum Post: Driving MOSFET with Op Amp

    William Mack
    I am driving a MOSFET with a typical input capacitance of around 2800pF with an LM324 R-R op amp in the linear mode using a standard function generator. Unfortunately, the LM324 cannot drive the MOSFET much beyond 10Khz because the MOSFET gate starts drawing current past 10Khz. I want to drive the MOSFET...
    on Apr 13, 2012

  • Forum Post: Re: Driving MOSFET with Op Amp

    William Mack
    Hi Paul, Thanks for your response. Will the LM7322 work as a drop-in replacement for an LM324 in a single-supply circuit?? I'm concerned whether the input can be grounded like the LM324. --Bill
    on Apr 17, 2012

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