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Type: Posts; User: FvM

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  1. Closed: Re: Confusion with relating the sensor output voltages from its datasheet

    I agree that the datasheet is very clear about expectable output voltage.

    But if you plan to measure 500 ug acceleration, you should carefully read the datasheet info about noise density and...
  2. Closed: Re: Stability issue of the closed loop feedback in fully differential ampliifer

    Whats's the purpose of feedback resistor in your simulation circuit? If it's DC bias, the feedback path should be filtered in a way that it doesn't ruin phase margin.
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    Closed: Re: Charging Voltage for a 1.2V NiMH Battery

    Charging VR450 continuously with 20 mA will not quickly damage it but probably reduce its lifetime by overcharging it. Continuous current without voltage limiting shouldn't be higher than the...
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    Closed: Re: Metastabilty and data loss

    You should ask yourself what you consider wrong data?

    1. Single bit data, toggling at arbitrary times. You'll either read the old or the new data. Both or equally correct, just different.

    2. A...
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    Closed: Re: Connect MQ135 Gas Sensor to Raspberry Pi 3B+

    Values read for unconnected (floating) ADC inputs are meaningless. You can either connect known DC voltage for test or just ignore these values. Check the values for ADC0 input connected to sensor.
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    Closed: Re: Distance between MCU-Phy-Magnetics-RJ45

    You have to check impedance matching and termination for each connection. Ethernet is usually terminated at the PHY, in this case, there are no restrictions for PHY to magnetics or magnetics to JJ45...
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    Closed: Re: How to create a voltage selector circuit

    The usual solution, also implemented in LM3915 dot matrix mode is working like below:
    - have comparators for each threshold level
    - have a priority encoder to pass only the output of the most...
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    Closed: Re: Charging Voltage for a 1.2V NiMH Battery

    V450HR has a datasheet, it's strongly suggested that you observe the specifications when designing your charging circuit.
    ...
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    Closed: Re: Electrical Length Analysis

    A reactive load shifts the resonance frequency, it can't change the electrical length of the resonator itself.

    Intuitive explanation, determine equivalent lumped L and C representing the coaxial...
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    Closed: Re: Old Altera FPGA EPM7128

    EPM7128S is the obsolete 5V version. Mouser has only one type on stock. If you can switch to pin compatible 3.3V EPM7128A, the series is still in production.

    The antique devices are probably a bit...
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    Closed: Re: Wireless rectenna on flexible board

    The micro strip trace width may be correct, the trace outside the ground plane is not. You are adding considerable series inductance in the flex design.

    Compared to the Johanson reference designs,...
  12. [SOLVED]Closed: Re: PWM applied to load while current limiting on load simultaneously

    I'd say, you have partly understood my points. Apparently not yet the point about energetic efficiency.

    - - - Updated - - -

    To give a simplified example. Assume you get 80% efficiency at 1.5 V...
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    Closed: Re: LM5642 buck converter not work

    Connection of KSx and Ilimx is wrong in your schematic. Probably only a drawing error.

    As your measurement shows, the chip is hold in shutdown. May be due to previous OVP or UVP fault.
  14. Closed: Re: [Moved] CAN Transceiver Chip calculating effective CANH to CANL capacitance

    Near. Not C1||C2, it's a series circuit, Cdiff + C1*C2/(C1+C2).

    No, Ci and Cdiff values are representing the same physical capacitance. Cpin = Ci + C1
  15. [SOLVED]Closed: Re: PWM applied to load while current limiting on load simultaneously

    The standard potential of a water electrolysis cell is 1.23V, applying a higher voltage doesn't increase the gas yield per ampere second but causes losses. Practical electrolysis processes operate at...
  16. Closed: Re: When ad7321 collects voltage, a spike voltage appears

    You don't show what's connected to VIN0 and VIN1. The ADC inputs are usually driven by a low impedance buffer, otherwise charge injection of the sampling switches will be observed.
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    Closed: Re: In accuracy in AC Voltage measurement

    ESP32 maximum ratings suggests that IO pins have clamping diodes, but there's no current rating. For additional safety, you may place external clamping diodes (low leakage schottky or general purpose...
  18. Closed: Re: is it possible to ZIP a file using STM32F4 ? Any library available?

    I was talking about minizip package as zlib addon. It's said to generate *.zip files, but I didn't check myself.
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    Closed: Re: In accuracy in AC Voltage measurement

    Main problem is Z-diode leakage current. Diode characteristic isn't that steep as you apparently expect. Additionally may be ESP32 input current.
  20. Closed: Re: is it possible to ZIP a file using STM32F4 ? Any library available?

    You didn't review the features of the package, right?
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    [SOLVED]Closed: Re: Average vs RMS load-current for LDO design

    LDO pass transistor power dissipation is (Vin-Vout)*avg(Iout). Additional considerations for SOA. Irms isn't present in the calculations.
  22. Closed: Re: Iran Core Transformator No Load Current (Core material)

    May be better. For completeness, we would measure current phase angle. Current can be lower due to higher permeability or lower losses.
  23. Closed: Re: Quartus 19.1 on Ubuntu 18.04 problems with internet and usbblaster

    As far I'm aware of, there's no 64-bit code running with Quartus 13 under WinXP. But I didn't check specifically.

    USB Blaster driver and JTAG stack components are definitely 32-bit.
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    Closed: Re: Relating Transmitter dBm to uV/m and EIRP

    FCC measures actual field strength in 3 m distance. If you can prove that your application environment involves a respective attenuation, it should be considered. It would be good to have an antenna...
  25. Closed: Re: is it possible to ZIP a file using STM32F4 ? Any library available?

    O.K. zlib with minizip addition.
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