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Type: Posts; User: FvM

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  1. Closed: Re: How can we measure magnetic field strength generated by an antenna?

    The obvious solution is a sensing coil. Relation between magnetic field strength and induced voltage is derived in physics textbooks (Faradays law).

    As previously mentioned, measurement of reader...
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    Closed: Re: Arduino-Pc interface

    Arduino must not be connected to IDE at the same time.
  3. Closed: Re: Sending data from pic microcontroller to web server using ethernet.....

    PIC18 isn't very effective for ethernet implementation, but feasible. Examples are available from microchip.
    You get less software overhead by using a Wiznet ethernet controller with hardware...
  4. Closed: Re: Designing a power bank with Qualcomm Quick Charge 3.0

    What does it mean? Which features are required?
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    Closed: Re: Could this electric shower be lethal?

    Some interesting points characterizing the device are quoted below:

    The heater

    156144

    The "earthing" electrode below the shower head

    156145
  6. Closed: Re: Network analyzer calibration for RF test points

    What the intended accuracy (delay, Z0)? MS-156C itself has limited precision, see e.g. VSWR spec.

    Did you consider to make your own calibration kit?
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    Closed: Re: readback the firmware Cyclone IV

    I would expect EPCQ16 used as configuration device. You want to check if it's connected to the FPGA respectively.

    Setup the configuration memory as attached AS flash in programmer and performe...
  8. Closed: Re: What is the cutoff frequency of the capacitively loaded Transmission line

    If mtline is setup as an ideal 50 ohm transmission line, the answer is very simple and you should be able to derive it yourself. Just a first order low pass with tau = c*Z0/2.
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    Closed: Re: Rigid flex Cross section OrCAD PCB Designer

    Solder mask and -paste are linked to top and bottom copper layer. You can't place component pads at internal layers and get no auto generated solder mask and solder paste for this layers, unless the...
  10. Closed: Re: Voltage spikes on the Gate-source of upper H-Bridge MOSFETs (for LLC converter)

    We are curious to see the result of the common mode test suggested by Easy peasy.
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    Closed: Re: Rigid flex Cross section OrCAD PCB Designer

    I would expect common stencils for rigid and flex part. A support may be required for the flex part.

    Special problem is second printing pass. It may be difficult up to impossible, depending on...
  12. Closed: Re: A way to delay UART frame for approx. 200-300us.

    At which Baud rate?
  13. Closed: Re: Difference between two biquads shown in diagram

    You are right, I overlooked one short in the first circuit.

    The answer is, fully differential is only possible in the four block topology.
  14. Closed: Re: Difference between two biquads shown in diagram

    Both circuits implement different transfer functions. Why don't you calculate it?
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    Closed: Re: Need help for read hex code

    Like many other flash CPUs, the application program can be readout in-circuit by manufacturer provided ISP tool or by general purpose programmer off-circuit. But it's only possible if the flash...
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    Closed: Re: help please tosimulate this file

    What do you want to achieve? Quartus is a FPGA synthesis tool, not a simulator. You may use the free Altera Starter Edition of Modelsim shipped with Quartus 13.1

    To simulate the design, you need...
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    Closed: Re: ADC output bit rate and PCB layout

    475 MBPS SDR and 950 MBPS DDR, why not read the datasheet yourself?
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    Closed: Re: NPA 201 Absolute Pressure Sensor ODR help

    That's what I read into the datasheet. The specification is a bit vague, you may want to ask the manufacturer for an unequivocal spec or check the actual behavior yourself.
  19. Closed: Re: NFC System with antenna which can provide from 1 A/m to 7.5 A/m signal strength

    1.5 to 7.5 A/m is the standard field strength according to ISO 14443 which has also been adapted for NFC, active mode. It can be achieved by most reader chips on the market without additional power...
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    Closed: Re: readback the firmware Cyclone IV

    The configuration has to be readback from the configuration device, not the FPGA.
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    Closed: Re: NPA 201 Absolute Pressure Sensor ODR help

    There's a minimum read time spec.
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    Closed: Re: ADC output bit rate and PCB layout

    Series 7 is specified for 950 MBPS DDR LVDS speed, 910 MBPS has little margin. It's suggested to use digital phase alignment to adjust the receiver timing.

    DCO and FCO must be sent to the FPGA...
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    [SOLVED]Closed: Re: Rookie making an audio step-up transformer

    Audio transformer needs to care for main inductance which forms a high pass with the load impedance. If you want e.g. < 30 Hz lower cut-off frequency, the primary main inductance Lh1 must be > 8...
  24. Closed: Re: Mains leaking currents causing problems in my house

    Removing Y capacitors can reduce ground leakage, but it doesn't change the fact, that a PC PSU isn't designed with reinforced insulation, thus ground faults can happen. Neither appliances like dish...
  25. Closed: Re: Which transformers can pass approvals testing rergarding isolation voltage testin

    With TIW used for secondary winding, the critical clearance is pin 9/10 to primary windings, including aux. Changing the secondary pins to 7/12 slightly increases the clearance. Or use additional...
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