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Type: Posts; User: FvM

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  1. Closed: Re: can triacs rapidly switch AC into a transformer

    Gate driver should be of course referenced to common source node.

    There are several reasons why the "chopper" circuit can't be used in the shown basic configuration:

    - Mains input filter...
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    [PIC]Closed: Re: Sleep mode - dspic33ch128mp508

    Perhaps we can paraphrase the question:

    Is it reasonable to start system level microcontroller programming without studying the datasheet thoroughly and understanding the specific CPU functions?
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    Closed: Re: Hints for pin assignment

    I believe the question has been already answered by Akanimo. All externally connected IO pins, user clock, reset etc. must be present in the top module interface. But not dedicated pins, e.g. power...
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    Closed: Re: OpAmp BW for Feedback loop

    The PWM circuit makes no sense as drawn, please review. I guess the µC PWM output should be controlling the switch, not feeding a switch terminal.

    It's necessary to analyze the exact low pass...
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    Closed: Re: Differential probe build

    I mean one multitap voltage divider instead of three.

    3 kV/mm is a large multiple of the clearance values suggested by safety and PCB design standards. But you don't even have it. Consider that 2...
  6. Closed: Re: Looking for SPICE model for coupled lossy transmission line

    If you want a S-parameter model, why are you asking for a SPICE model? A simple behavioral model with constant delay and sqrt(f) proportional losses will fit a real transmission line much better than...
  7. Closed: Re: PIC microcontroller debugging- dspic33ch128mp508

    Microchip doesn't use JTAG interface for debugging.


    Unlikely, it's 18 years old. I guess you mean MPLAB X IDE 5.10.


    #pragma config ICS = PGD3
    You didn't tell which debug adapter you are...
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    Closed: Re: Differential probe build

    At least two problems:
    - still asymmetrical voltage divider by not switching the input side of the negative dividers
    - PCB clearance not suited for 2 kV input voltage

    Why not single compensated...
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    Closed: Re: parasitic coil capacitance from frequency

    Parasitic coil capacitance refers to parallel capacitance, I presume. Thus you are looking for the parallel resonance of the unloaded coil. The best approach for unloaded resonance measurement is a...
  10. [SOLVED]Closed: Re: impedance matching methods | ADS matching tool

    The most simple solution to the exercise problem (match 220 ohm || 0.877 pf to 50 ohm in 1.2 to 1.8 GHz band) is a single series inductor of about 9.6 nH. You find it by applying Smith Chart method...
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    Closed: Re: How to make image impedance equal

    Suggest to read the section 8.2 up to the posted snippet more thoroughly. Your questions are already answered in the text. Look from where they are analyzing symmetric networks (Zi1 = Zi2).
  12. Closed: Re: Inrush pulse in 0R56, 1206 resistor....gradual degradation?

    What you name "scope shots" are simulation waveforms under probably unrealistic conditions. How about a simulation with realistic mains impedance?
  13. Closed: Re: how to design a thermostat without Microcontroller?

    Unfortunately we didn't yet see a complete schematic that comprises the various changes and supplements mentioned in the posts, including power supply, voltage regulation, bypass capacitors. I'm not...
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    Closed: Re: copper pour in top layer with vcc net

    Posting the gerber files might clarify the problem.

    We have insufficient information yet. If the PCB is made with correct component definitions and design rules, no short should ever happen. The...
  15. [SOLVED]Closed: Re: impedance matching methods | ADS matching tool

    I neither understand the proceeding in the document. Obviously the simple matching network at page 6 fulfills the requirements (|S11| < -9 dB) while page 1 doesn't.

    200 MHz matching circuit...
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    Closed: Re: Hints for pin assignment

    I merged the two threads according to forum rules. "Ask related questions in one thread".

    The question has been basically answered by asdf44 in post #8. Single ended I/O pins within a bank can be...
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    Closed: Re: Differential probe build

    I don't recognize a differential probe circuit. Previous post #76 looks better.

    You have insufficient PCB clearance and the range switch is hardly suited for claimed 2kV. The usual solution found...
  18. Closed: Re: Bypass dc signal which is accompanied with a low frequency sinusoidal signal

    Strictly speaking you need large time constant, not necessarily large capacitor. You should talk about circuit impedance first. What's the load receiving the AC signal?
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    Closed: Re: parasitic coil capacitance from frequency

    Can't be answered without knowing the complete measurement circuit.
  20. Closed: Re: Looking for SPICE model for coupled lossy transmission line

    The question is less clear than it may seem at first sight. You can easily make a LGRC lumped transmission line model, also coupled lines can be modelled by combining multiple transmission line...
  21. Closed: Re: dsPIC30F2010 - 30 I/SP restarts at interval of 20seconds for no known reason

    Besides code review, you should also learn to read reset reason register.
  22. Closed: Re: VHDL use of 'Z' std logic for bus, or should one use interconnect?

    'Z' or 'X' isn't a detectable state in synthesized logic.

    Respectively Quartus synthesis tool assumes that 'Z' can't be sensed on input and proceeds to the else condition.

    The version_reg code...
  23. Closed: Re: Does it exist an AC to AC converter in small package for converting 220v to 110v?

    Toroid transformer is an option if you want a smaller solution, the OP might consider it or refer to a classical EI core design. It's also a good question if the load is actually 550 VA (not 1000VA...
  24. Closed: Re: Does it exist an AC to AC converter in small package for converting 220v to 110v?

    Moderators have deleted a number of posts from this thread which didn't contribute to solve the original question.
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    Closed: Re: IGBT Short Circuit problem

    Dear kripacharya, I believe you are somehow confusing the threads. Your first contribution to this thread is post #26, Easy peasy dropped in with post #6, giving valuable suggestions.
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