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Type: Posts; User: garimella

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  1. Replies
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    Closed: instruction set translator

    I am just doing small assignment where in I need to develop 8086 instruction translator on 8051. 8051 reads 8086 op-codes from eprom and executes instructions as though 8086 were present. Any ideas...
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    Closed: Re: Using Patent Ideas for Next Product

    Do you mean that patents can be perpetual? We are planning to use ideas from a patent 25 years ago and add some additional details to make a newer product. Will that hurt us? Has anybody done this...
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    Closed: Using Patent Ideas for Next Product

    Hi, I read somewhere that US patents are valid till 20 years. If the time expires, can somebody use those patent ideas for making their commercial products?
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    Closed: Re: Why this Matlab code not work

    Oh.. silly me. It works
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    Closed: Why this Matlab code not work

    I have an array(arry(k)) that contains the sampled waveform. All that I am trying to do is to subject the array data to 2nd order IIR HPF and store the result in another array. But I am getting error...
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    Closed: Help with DMCI MPLABX IDE

    I have installed he latest version of MPLABX IDE and evaluating DMCI interface in simulator mode. I am trying to plot sine wave in run time. I have used the example program given by microchip. But...
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    Closed: IIR filter response not infinite

    I just simulated the impulse response in matlab for a first order IIR low pass filter using the command impulse (tf[50],[1 50]). The output seems to be lasting for a finite period. Can anybody...
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    Closed: Log variables with debugger

    Hi

    I am using ICD3 debugger for microchip MCUs and I am interested in logging a variable in run time. Could not find helpful link.
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    Closed: Re: EM field around Current Transformer

    Hi KlausST

    I am unable to share the complete schematic or PCB files because of customer's request not to do so. In the meantime, I have analyzed further and following are my observations.

    1....
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    Closed: Re: EM field around Current Transformer

    Some discovery from my side, but I need confirmation. I have transformer based current injection kit, which shares the same distribution board,from where I tap 230V to power my board ( through AC-DC...
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    Closed: Re: EM field around Current Transformer

    No, It is 2 ohms burden. It works for a while and then suddenly everything fails.
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    1,717

    Closed: Re: EM field around Current Transformer

    I got my ADC damaged in two boards after injecting currents (after approx ten iterations). The ADC is about 100mm distance from the primary wire. Input currents were in the order 0-10A, 50 Hz AC.
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    Closed: Re: EM field around Current Transformer

    Hi FvM

    The datasheet says that secondary inductance is around 8H. Will it not create EM field?
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    Closed: Re: EM field around Current Transformer

    Hi

    CT data sheet https://www.mouser.in/datasheet/2/192/CT07-1003158.pdf. Please advice for the precautions to be taken
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    Closed: Re: EM field around Current Transformer

    For CT secondary , I do have a protection diodes in shunt along with the resistor. My question is can current in primary cause sufficient EM field to damage the electronics?
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    1,717

    Closed: EM field around Current Transformer

    Hi

    I am receiving input current in the range 0-50A, 50 Hz AC current. I have a 1000/1 CT. Nearby , I have Downstream electronics consisting of ADC and MCU for displaying the input current. The...
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    Closed: Re: Digital Control in MCU

    I think slow convergence is due to floating point variables. Tried using Fixed point arithmetic. But the output seems to be oscillating. The code is given below. All variables are Q15 format. Should...
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    Closed: Re: Digital Control in MCU

    Hi

    I am going to provide details. But please have a quick look at my matlab simulation code provided. In bode plot, I see variable phase lag. I use this program to discretize(open loop TF) and...
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    Closed: Digital Control in MCU

    Hi

    I have recently simulated a digital control system comprising a PI compensator for a integerator plant for tracking a sawtooth signal. Everything works fine in simulation.
    Converted to...
  20. Closed: Thumb rule for selecting filter frequency cut off

    Hi

    I am experimenting with analog and digital filters. Would like to know the thumb rule for selecting filter frequency cut off.
    I want to realize 4th order filter by combining analog + digital
    ...
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    Closed: Re: Dealing with Q15 for arc Tan function

    Can you share the link or lib file that works
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    Closed: Re: Dealing with Q15 for arc Tan function

    Hi

    _Q15 y = Q15(0.866);
    _Q15 x = Q15(0.5);

    _Q15 check = _Q15atanYByXByPI(x,y);

    returns 8192 ( 45 degrees) and not 60 degrees. Even if I flip , results are same
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    Closed: Dealing with Q15 for arc Tan function

    Hi

    I am using dspic libq library to experiment with Q15 functions. The difficulty I am facing is that _Q15sinPI() and _Q15cosPI return in range -32768 to +32767 corresponding to -pi to +pi. But...
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    Closed: Verifying control algorithm

    Hi

    I have a designed a PID controller in simulink with the plant model and everything works fine. I have converted z domain to difference equation and fused the program in microcontroller and...
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    Closed: Re: why does this simple program not work

    Hi
    I hooked these values kp=1 and ki=0.1 in simulink and works ok. Converges in 100s. But no random fluctuations. I also changed the values as you suggested and indeed there was convergence. Strange...
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