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Type: Posts; User: FvM

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    Closed: Re: Enhancement of 2.4GHz rectifier

    What do you mean with "same result"? You can't achieve more than 100% rectifier efficiency. Assuming 2V LED + rectifier forward voltage for simplicity, LED current can't be higher than 0.5 mA at 0...
  2. Closed: Re: Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics

    You can determine the optimal pulse timing for harmonic cancellation using fourier series and Excel solver. I'll send you an example tomorrow.
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    Closed: Re: finding patent of a product

    It depends. If a product is directly protected by a patent, US law requires to mention the patent file in datasheet. See e.g....
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    Closed: Re: sine/cos encoder to digital

    Just look at the waveform...

    156538
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    Closed: Re: sine/cos encoder to digital

    What did you conclude?

    The higher sampling rate doesn't change the picture, you have superimposed ripple during the first 45 degree. To me, it looks like a start transient. It shouldn't happen if...
  6. Closed: Re: Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics

    A similar modulation scheme with harmonic cancellation is referred to as Magic Sinewaves, for some reason using an even number of pulses per half cycle. https://tinaja.com/glib/msinprop.pdf
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    Closed: Re: sine/cos encoder to digital

    The angle values are monotonic, but not equidistant. Obviously the sin/cos readings are not corresponding to constant speed rotation, there seems to be a higher frequent ripple superimposed.
  8. Closed: Re: Rectifier diodes with bypass capīs & gounding speaker basketīs

    Up to now, I was under the impression that the main purpose of rectifier bypass caps in audio equipment is to reduce MF and SW interferences from disturbing AM radio reception. It has no effect when...
  9. Closed: Re: sampling rate vs rate of change of input for control system

    Not necessarily satisfied. It depends on the speed change rate.

    A more practical viewpoint could be: How is the position information processed in your system? If you are running a control...
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    Closed: Re: sine/cos encoder to digital

    atan2() function has no "undefined situations". It's defined over full four quadrants. Review literature before guessing…


    Simultaneous sampling of both inputs would be good. Otherwise you have...
  11. Closed: Re: Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics

    Just for clarification, with 5 pulse unipolar, you are referring to a waveform like below?

    156531

    It has 5 degrees of freedom, should allow to set fundamental magnitude + eliminate 4 harmonics...
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    Closed: Re: sine/cos encoder to digital

    You'll use atan2() function to convert sin/cos values to angle after digitizing it.
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    [PIC]Closed: Re: XC8 XLCD with PIC18 error

    I presume it's a Proteus simulator error message?

    Check if xlcd.h is configured for 4-bit mode (the default). If this is the case, there may a problem that the simulator sees an apparent write...
  14. [SOLVED]Closed: Re: Mains leaking currents causing problems in my house

    What devices are you talking about? Appliances with two pin connector are designed with safe insulation. If they involve metal cases or parts, the earth leakage current must be limited to safe...
  15. Closed: Re: Doubt in the concept of 3 phase thyristor based full wave fully controlled rectif

    Not sure if the thyristors in your schematic are real semiconductor devices or virtual switches with a logic input. In the former case, the trigger current has to be applied between gate and cathode,...
  16. Closed: Re: "RS-232 port to transfer data to PC for analysis"

    The emphasis is on implementing, not the meaning of CRC. How should it be implemented in the bridge device which is just transporting UART characters?

    If you build an intelligent USB to UART...
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    Closed: Re: Baud rate limitation in PIC Microcontoller

    The table is only giving examples for certain crystal frequencies, for other frequencies use the given formula.

    16 MHz is one of the "standard" crystal frequencies that can't generate 115 kBaud.
    ...
  18. Closed: Re: Low and high impedance of low pass stepped impedance filter

    The low and high microstrip impedances can be chosen arbitrarily within certain useful limits. In the first place, substrate properties and feasible minimal and maximal conductor width are...
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    Closed: Re: TVS Diodes power ratings for IEC 61000-4-5

    According to my reading of the standard, power lines have to be tested with 1.2/50 ĩs (8/20 ĩs short circuit) pulses. You should choose TVS diodes that are specified for 8/20 ĩs, e.g. Littelfuse...
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    Closed: Re: Baud rate limitation in PIC Microcontoller

    Please review the datasheet, particularly chapter 10.1 USART Baud Rate Generator. You'll see that it's not feasible with standard crystal frequencies, but well possible with "UART" crystals like...
  21. Closed: Re: "RS-232 port to transfer data to PC for analysis"

    MCP2221 is a hardware USB CDC/HID bridge, it doesn't involve a microcontroller core. As for the UART functionality, it's similar to popular USB-to-UART bridges from FTDI, SiliconLabs or Prolific.
    ...
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    Closed: Re: How to generate sine wave using Verilog?

    Use the most significant (= sign) bit.
  23. Closed: Re: Mains harmonic emissions for dimmable offline LED drivers.

    They may e newer or more specific test specifications for dimmable LED lamps. The best fitting specification in IEC 61000-2-3:2009 says under C.5.3 Luminaires:



    My general assumption is that...
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    Closed: Re: TVS Diodes power ratings for IEC 61000-4-5

    You should clarify which of the 61000-4-5 test pulses has to be handled by the protection circuit, also what's the intended TVS voltage. TVS ratings are referring to 10/1000 us pulses which have...
  25. Closed: Re: Trying to understand mismatched antenna behaviour above 20GHz without equipment.

    Looks like standing waves of a 1.5 ns (about 30 cm) transmission line.
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