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Type: Posts; User: KlausST

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  1. Replies
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    Closed: Re: problem with coding 123

    Hi,


    to adjust to DAC digital input range --> and thus its analog output range to full scale...

    Klaus
  2. Closed: Re: Spikes in output voltage in Buck Converter

    Hi,


    "100uF" does sound like an electrolytic capacitor. These are not suitable for fast spikes. They are for low frequencies only.

    --> use a ceramics capacitor or a foil capacitor (value 100nF...
  3. Replies
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    Closed: Re: problem with coding 123

    Hi,

    I dont think that 0x61 is the correct device address. How did you decide it?

    The wiring is unclear. Draw a sketch.

    Klaus

    Added:
  4. Closed: Re: Connect MQ135 Gas Sensor to Raspberry Pi 3B+

    Hi,


    are you sure 5V is within the specified ADC input range?
    What output value do you expect with this configuration.
    What range of ouput values do you see?

    ****
    Generally: No input...
  5. Closed: Re: Seeking for zerocrossing switching without using microcontroller

    Hi,

    You talked about a reactive load... and power and resistor and capacitor. Thus I assumed you talk about load resistor and load capacitor.
    But reviewing the document I now guess you want to...
  6. Closed: Re: Seeking for zerocrossing switching without using microcontroller

    Hi,


    I'm not sure whether you ask about this:
    P(in Watt) = V x A x cos(phi)
    V and I need to be RMS values.

    Klaus
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    Closed: Re: Charging Voltage for a 1.2V NiMH Battery

    Hi,

    To me it seems you did not read how to charge a NiMH battery or you did not understand it.
    Some basics (details are already given as link above)
    * don't push voltage into a battery
    * push...
  8. Closed: Re: Beginner question about a micro-controller project

    Hi,

    It's not fair that you should build a prototype without knowing full specifications.

    Try to get full requirements first.

    Klaus
  9. Closed: Re: Beginner question about a micro-controller project

    Hi,

    I agree: If you have experience with AVR, then use them. There are so called "pico power" AVRs for low power consumption. For sure only during "power down" --> software controlled. Read AVR...
  10. Closed: Re: Arduino based irrigation controller misbheaving at a particular site.

    Hi,


    * Not driven at all (input, floating)
    * weak pull down with external current to HIGH.
    * switched as ouput, driven LOW, but too high external current
    * driven as ouput, PWM (or randomly...
  11. Replies
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    Closed: Re: How to create a voltage selector circuit

    Hi,

    Your circuit:
    We see a lot of "voltages". Some are used as supply, some are used as input signal AND supply. Not knowing the meaning of the "voltages".
    +4 is never used
    +6 is never used
    ...
  12. Replies
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    Closed: Re: Charging Voltage for a 1.2V NiMH Battery

    Hi,

    Pleae clarify:
    You said you "found about charging voltage" but then later you said you "did not find about charging voltage".

    It's confusing to me.

    Even the given chart shows the...
  13. Replies
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    Closed: Re: How to create a voltage selector circuit

    Hi,

    Unclear, uncomplete informations.
    A black box with some lines...
    I don't know what this means.

    If I'd select the current flow .... I'd try an analog switch/MUX.

    Klaus
  14. Replies
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    Closed: Re: In accuracy in AC Voltage measurement

    Hi,

    Again: Precision or accuracy?

    Again: there is no general answer, because we dont know your exact waveform, whether there is (variable) distortion, noise and so on...additinally again: we...
  15. Replies
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    Closed: Re: Charging Voltage for a 1.2V NiMH Battery

    Hi,

    There are many informations in the internet. Just do a search on your own.
    Wikipedia, every NiMH battery manufacturer, every charger manufacturer, other sources (like...
  16. Replies
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    Closed: Re: In accuracy in AC Voltage measurement

    Hi,


    I assume what you want to ask about is precision, not accuracy.

    My answer is: No.
    Not because the ferrite bead, the 1k, or the BAT54. No, mainly because of the measurement method.

    AC...
  17. Replies
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    Closed: Re: Old Altera FPGA EPM7128

    Hi,

    EPM7128 is no FPGA, it is a CPLD
    A simple internet search shows that Mouser has some on stock.

    Klaus
  18. Replies
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    Closed: Re: In accuracy in AC Voltage measurement

    Hi,

    * I gave the leakage current at 50C
    * You worry that you use it not only at room temperature. This is somehow useless information.
    What temperature else? -50C? +100C? +300C?
    * ESP32...
  19. Replies
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    Closed: Re: LM5642 buck converter not work

    Hi,

    so you used the eval-board?

    and you modified it?

    Why not step by step modify it back until it works again?

    Klaus
  20. Replies
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    Closed: Re: Multiplication in vhdl

    Hi,

    There are many discussions, tutorials and solutions in the internet. Even videos.

    Please go through some of them first.
    If there still are any questions, please give the source you refer...
  21. Closed: Re: When ad7321 collects voltage, a spike voltage appears

    Hi,

    please use the link to the manufacturer internet site. There you get the latest and most reliable informations.

    Spike:
    This is caused by the "track and hold" capacitor and is quite usual...
  22. Replies
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    Closed: Re: In accuracy in AC Voltage measurement

    Hi,


    ST BAT54S datasheet says:
    * typ: 0.05uA @ 5V and 25C.
    * typ: 0.45uA @ 5V and 50C.

    I assume this error may be a factor of 1000 better than a 5.1V zener diode (in breakdown direction)....
  23. [SOLVED]Closed: Re: PWM applied to load while current limiting on load simultaneously

    Hi,

    I dont see how "car battery failure" comes into play now...

    If possible, try to fix one problem first, then the next.


    Klaus
  24. Replies
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    Closed: Re: fastest multiplication alghorithms

    Hi,

    I think there is a big difference whether you do 8x8 bit integer multiplication or 32bit x 32bit floating point multiplication.
    One is the lower end, the other is the higher end ( or at...
  25. Replies
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    Closed: Re: In accuracy in AC Voltage measurement

    Hi,

    there are many discussions, documents and even videos about overvoltage protection with clamping diodes. I assume millions.
    Just do a search.
    Even here in the forum are many threads.
    ...
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