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Type: Posts; User: FvM

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  1. Closed: Re: Off-the shelf transformer for push pull converter

    Or referring to ∫Vdt (ET in your terminologie)
    I = ∫Vdt/L
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    Closed: Re: Experienced CADSTAR user's

    You should take a look at Pulsonix. The Software has been developed by former Racal Redac (the origin of Cadstar) guys. The look and feel is still Cadstar like.
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    Closed: Re: Solving issues in my PCB grounding

    I guess there's no high voltage generated on the board. Hence it's a problem of the power supply. What is it?
  4. Closed: Re: USB device( related to DMA and sram) and USB protocol

    Non of the question can be answered without referring to the specific USB device type und functionality. Which device are asking about?
  5. Closed: Re: Is a snubber circuit required with zero-cross optocoupler

    I experienced a case where a MOC3040 plus triac combination was periodically self triggered even with pure resistive load by power supply dV/dt. A 220 ohm/47 nF snubber and filter was added to the...
  6. Closed: Re: Off-the shelf transformer for push pull converter

    Most transformers on the market, e.g. from WE, have maximum flux specification in the datasheet.

    Dedicated flyback transformers, e.g. the PoE WE transformers in your second link usually have a...
  7. 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...
  8. 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.
  10. 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...
  12. 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...
  16. 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.
  18. 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...
  19. 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?
  21. 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...
  25. 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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