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  1. Replies
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    Closed: Re: Transferring data from PS to PL

    What is PL and PS?

    See forum rules, you shouldn't use
  2. Closed: Re: Sine PWM calculated with pic, instead of using table

    Regarding PWM scheme in post #19, it produces intended sine waveform only for resistive and under circumstances inductive load.
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    Closed: Re: Bridge Rectifier won't Rectify

    It really depends on the intended probe frequency range, which wasn't specified along this thread. The shown resistor divider primarily suffers from HV resistor parallel capacitance, which is causing...
  4. Closed: Re: Pulse transformer output measured vs. calculated?

    O.k., voltage and current are almost in phase now, apparently a DC offset of the Rokowski measurements is causing a ramp in the current display, should be zeroed out.
  5. Closed: Re: Pulse transformer output measured vs. calculated?

    With an estimated capacitance of 1 pF for the 100 Mohm resistor, you get a zero at 1600 Hz. A single 1 nF compensation capacitor can at least improve the transfer function.
  6. Closed: Re: Pulse transformer output measured vs. calculated?

    Is it a similar divider as in your other thread?

    155054

    If so, I doubt that the voltage waveform isn't reproduced correctly. Similarly, what kind of Rogowski coil and integrator circuit are you...
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    Closed: Re: Bridge Rectifier won't Rectify

    Rectifier output voltage is clamped to n*diode forward voltage, e.g. a few 10 V in your design.
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    Closed: Re: Bridge Rectifier won't Rectify

    It's not surprizing to see large ripple at the rectifier output. Negative voltage as shown is however not feasible. Most likely explanation is the waveform distortion by the uncompensated voltage...
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    Closed: Re: STM32F3 built-in opertion amplifier

    You're simply confusing source and load impedances. Rain is the impedance of the source driving the ADC, minimal OP load impedance has nothing to do with it. Reconsider.

    As for your general...
  10. Closed: Re: Why does my homemade Yagi wifi antenna perform so poorly?

    You are right, driving element impedance depends on the reflector and director spacing. I found this table in Balanis Antenna Theory. Numbers are for regular half-wave dipole, folded dipole has 4x...
  11. Closed: Re: Why does my homemade Yagi wifi antenna perform so poorly?

    Thanks for mentioning the foam board. So it's actuality a folded dipole. Unfortunately it's seriously mismatched in this case, having typically 290 ohm impedance. In addition you have the problem of...
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    Closed: Re: Center tapped transformer (forward converter)

    You can try to make the 12 V inductor large enough to provide continuous current at 2 W load.

    Coupled inductors can basically work, obviously the inductor turns must have the same ratio as the...
  13. Closed: Re: Pulse transformer output measured vs. calculated?

    How do you measure it? Sure that the probes don't affect the circuit? The question isn't clear at all.
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    Closed: Re: verilog code using vivado

    The post body doesn't match the title. Where's the Verilog code?
  15. Closed: Re: Why does my homemade Yagi wifi antenna perform so poorly?

    As shown in the picture, it's a straight 60 to 75 ohm half wave dipole, not a folded dipole. This makes sense because it's roughly matched to the 50 ohm cable, however it misses at least a ferrite...
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    Closed: Re: Center tapped transformer (forward converter)

    Apart from possible ringing and overshoot, a forward converter shows only tracking outputs if both inductors are in continuous conducting mode (CCM).

    To achieve tracking over a wide output load...
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    [SOLVED]Closed: Re: magnet wire parasitic properties

    Self capacitance in the Snelling book means inter turn capacitance.
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    Closed: Re: Master slave connection

    If it's isolated RS-485, e.g. PROFIBUS network, it doesn't necessarily use ground connection. Star connection through "junctions box" is only applicable for lower Baud rates or short connections....
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    [SOLVED]Closed: Re: magnet wire parasitic properties

    Snelling, Soft Ferrites, paragraph 11.6 The Self Capacitance of a Winding does detail calculations of different winding configurations. The 1969 book is out of print, but available on archive.org.
  20. Closed: Re: 1 minute vs 1 second isolation voltage test for isolated offline SMPS transform

    You have previously written that the power supply is classified as basic insulation. Then the test is surely not performed with 3750 VAC. EN 61558 is e.g. specifying 2100 VAC for 300V working voltage...
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    Closed: Re: AD8428 Comon mode issue(?)

    I presume 0.2V additional output offset doesn't overload the ADC range. How about a 2-point correction (y = ax + b) of offset and scaling error performed in software?

    - - - Updated - - -

    I...
  22. Closed: Re: 1 minute vs 1 second isolation voltage test for isolated offline SMPS transform

    At least EN 61558 is still applicable in Europe, the UK standard has been recently released: BS EN IEC 61558-1:2019-06-25

    If it has been withdrawn in other domains, what replaces it?
  23. Closed: Re: Strategy for a multi signal generator using a MAX10

    Synthesis tools and simulators have surely to problem to recognize the purpose of false Verilog regs used as wire, they do the same when processing VHDL code which uses signal in both roles.

    But I...
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    Closed: Re: Active HF phase shifter?

    The all-pass circuit implemented in post #1 does ideally not involve magnitude variations, as longs as R >> Rs, Rd.

    If your application is fixed 90° phase shift over 1 - 30 MHz frequency range, I...
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    Closed: Re: AD8428 Comon mode issue(?)

    Expectable current measurement error due to AD8428 input offset is up to 1 mA (A Grade) respectively 250 uA (B Grade), in any case much higher than observed 130 uA. What are you complaining about?
    ...
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