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Type: Posts; User: FvM

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  1. Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

    The datasheet has proper specification of surface resistance, apparently you don't understand its meaning. See https://en.m.wikipedia.org/wiki/Sheet_resistance

    Antistatic bags are designed to...
  2. Closed: Re: Bandstop Filters With Extended Upper Passbands

    As in any well written scientific paper, terms are introduced in the text. θ is electrical length of a line segment, θr electrical length at resonance (center frequency).
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    [SOLVED]Closed: Re: What is the role of this transistor?

    It's a current limiting circuit, but the selection of component values seems questionable.
  4. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Sorry, I was referring to a different schematic, on the post #45 bottom, the only meaningful schematic in this post. The circuits in post #42 and #45 with load at the cathode side have also other...
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    Closed: Re: Place TX/RX Antenna?

    What do you specifically mean with "TRX system"?

    Why not elaborate the question? What do you try to achieve, why do you require isolation between RX and TX antenna? Do you intend half or full...
  6. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    As long as the SCRs aren't defective, the voltage across the capacitors can't exceed 8 to 10 V, because one SCR will trigger at this level.
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    Closed: Re: UC3845 ETD29 transformer PWM signal

    The post #1 waveform has apparently similar problems. Repeat the measurement with verified probe.
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    Closed: Re: UC3845 ETD29 transformer PWM signal

    The pin 6 waveform seems to indicate a defective or wrongly calibrated oscilloscope probe.
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    Closed: Re: UC3845 ETD29 transformer PWM signal

    May be. You would want to correct the dot marking in schematic.


    The numbers in post #1 suggest about 0.4 mm air gap, should be O.K.

    It's unclear at which node the post #1 waveform has been...
  10. Closed: Re: Considering the power amplifier for complex modulate signal

    Crest factor of different QAM signals can be easily found in literature, just ask Google. It's 4.23 dB for 256QAM, means you need at least 2.7 W amplifier peak power for 1 W average. I presume it's...
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    Closed: Re: UC3845 ETD29 transformer PWM signal

    The transformer circuit according to the dot symbols is forward instead of flyback.
  12. Closed: Re: Looking for an non-invasive sensor for a fitness machine

    No electricity, no motor. A flywheel, probably with an eddy current brake to absorb power.

    The "non-invasive" point is setting some restrictions, although no exactly explained. I read it as not...
  13. Closed: Re: Help needed; Check of PCB and some other questions

    Most sensitive net is open drain sensor output with 30 k internal pull-up. Should possibly use additional external pull-up.

    Power traces are unnecessarily small, also why not use a continuous or...
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    Closed: Re: Steady state power system design

    There's no relevant RC time constant in your circuit. Why don't you simply refer to the start-up waveform in TPS56220 datasheet? Optionally PSpice transient model?
  15. Closed: Re: Help needed; Check of PCB and some other questions

    To assess cross talk and voltage drop, we need to refer to the presently unknown circuit to estimate voltages, currents and net suceptibility.

    Maximum PCB length is in the range of 500 to 600 mm...
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    Closed: Re: ST7036i and mikroc STUCK

    Show the circuit schematic.
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    [SOLVED]Closed: Re: Interface Temperature Sensor

    The resistance curve seems to show a 5k NTC. To calculate the translation to voltage and ADC value, you need to know the circuit, apparently a voltage divider. The transfer function can be calculated...
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    Closed: Re: How to estimate signal power from IQ samples?

    Averaging instantaneous signal magnitude as described under 1) would work if the magnitude is constant (CW or FM signal). It doesn't work for a modulated signal where you need to average...
  19. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    The trigger voltage has to be applied between gate and cathode. R5 causes a negative gate voltage, in a real circuit it might cause damage of the SCR and trigger source.
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    [SOLVED]Closed: Re: 128 x 32 single port RAM VHDL code problem

    The other point in post #2 is nevertheless true. We don't see which part of the wave is incorrect, we don't even know which part of the code has been created by you and what's the exercise...
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    [SOLVED]Closed: Re: 128 x 32 single port RAM VHDL code problem

    The code looks like a template to infer FPGA block RAM. In so far it's well synthesizable.
  22. Closed: Re: SMA-Microstrip transition removal for large-signal measurement of PA

    Looks like four cold solder joints...
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    [SOLVED]Closed: Re: Adding '1' to a std_logic_vector in VHDL

    RCO is evaluating P input but should evaluate temp respectively Q.
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    Closed: Re: A Code issue in Verilog

    The compiler assigns unique hierarchical names for unnamed generates, review LRM 27.6.
  25. Closed: Re: Differential comparator with reference comparison voltage level

    I have presently no access to IEEE, thus I can't review the paper.

    Basically it's a simple function: comp = sign(Voutp-Voutm-Vr)

    I can imagine many different implementations depending on the...
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