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Type: Posts; User: KlausST

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  1. Replies
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    104

    Closed: Re: ELECTRICAL AND ELECTRONICS Instrumentation

    Hi.

    The voltages should be added by squaring them beforehand then take the square root.

    I see 2V DC and
    A sine wave with 4Vp which is 2.828V RMS.

    2^2 + 2.828^2 = 4 + 10 = 14
    Sqrt(14) =...
  2. Replies
    3
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    151

    Closed: Re: Coin Slot acceptor Timer using PIC16f84a

    Hi

    I'd use a counter variable with smaller granularity.
    Maybe one second.
    Add 60 seconds for every inserted coin.
    As long as the counter value is not zero: switch ON the output and decrease the...
  3. Replies
    8
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    265

    Closed: Re: To develop 3D printer in PIC controller

    Hi,

    G Code is rather simple. Almost human readable. The description of the code is available in the internet.

    But in my eyes parsing the G code is the simplest part of your code. Controlling...
  4. Replies
    2
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    201

    Closed: Re: What do you mean by Predictive FIFO?

    Hi,

    we need some context.

    Where did you read about it? Give a link.

    Klaus
  5. Replies
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    265

    Closed: Re: To develop 3D printer in PIC controller

    Hi,

    For sure you can "develop" you own software for any microcontroller you like.

    But maybe you mean "compile":
    Then it may or may not be possible. It depends on how the source code is...
  6. Closed: Re: 32 bit left shift of a longint variable does not work

    Hi,

    I'm not a programner, but I often need to read some code.
    And here I'm always confused with the varable declarations.

    When you say "integer" variable ... are you sure it is a signed_int_32...
  7. Replies
    3
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    180

    Closed: Re: Power On Self Test in Automotive

    Hi,

    Whatīs the alternative?
    Doing memory test continously? .. And all other tests? like auto calibration routines...
    ..and what if the test has influence on the running system..because it...
  8. Replies
    3
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    132

    Closed: Re: help with speed control

    Hi,

    And what's the motor current rating?

    Klaus
  9. Closed: Re: [Microcontroller] Voltage Reading without ADC

    Hi,

    no one can tell you which resolution you need. You need to decide it on your own.

    Every time we give a suggestion you come with another information against it. This is time consuming for...
  10. Closed: Re: [Microcontroller] Voltage Reading without ADC

    Hi,

    With usual microcontroller there is no chance to input higher voltages than VCC to any I/O pin.

    *****
    I don't understand:
    * Your microcontroller has no (built in) ADC?
    * or you don't...
  11. Replies
    88
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    1,979

    Closed: Re: Differential probe build

    Hi,

    every added capacitor has tolerance, too.
    You need to calibrate them very precisely ... in either case, to get good HF CMRR.

    Klaus
  12. Replies
    88
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    1,979

    Closed: Re: Differential probe build

    Hi,


    No. Itīs just internally compensated to enable gain down to unity.

    But for sure with increasing gain.... bandwidth will be reduced.

    ***
    ...then yes, setting the gain with the feedback...
  13. Replies
    88
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    1,979

    Closed: Re: Differential probe build

    Hi,

    you want three different setups / ranges.

    Can you tell me for each setup
    * common mode voltage range
    * differential mode voltage range
    .. at the probe input.

    Klaus
  14. Replies
    88
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    1,979

    Closed: Re: Differential probe build

    Hi,


    Difficult.
    Look for capacitive trimmers. The selection tools and the datasheets will tell you.

    ***
    Another approach.
    Why not use fix 1M & 1k and trim them for best CMRR...
    and...
  15. Replies
    88
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    1,979

    Closed: Re: Differential probe build

    Hi,

    MIN value makes no sense in my eyes, because it makes performance worse.
    I recommend to optimize in direction "better performance" --> Higher resistance value.

    Klaus

    With lower value...
  16. Replies
    88
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    1,979

    Closed: Re: Differential probe build

    Hi,

    I talked about "common mode", but you simulated "differential mode"
    According datasheet differential mode input voltage range is +/-2.5V.

    Thus distortion is expectable.

    Klaus
  17. Replies
    9
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    489

    Closed: Re: German schematic conventions?

    Hi,

    I saw the schematic and immediately thought " this is a SIEMENS industrial schematic from the 1970s".
    Now I saw it's from the 1990s.

    I think the symbols are more "SIEMENS style" than...
  18. Replies
    19
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    774

    Closed: Re: I/O banks in an FPGA. Is it important for routing?

    Hi,


    You definitely need to read MAX10 documentation.
    Some pins may have dedicated function, some pins may be configured for different functions.

    Klaus
  19. Replies
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    1,979

    Closed: Re: Differential probe build

    Hi,

    R6, R9 need to be as high value as possible to get best precision and best common_mode_rejection.

    For 3000Vp I recommend to go close to full 7.5Vp (useful common mode input range of Opamp)...
  20. Closed: Re: Mounting GPS ceramic patch antenna (Passive) on double sided PCB

    Hi,

    Isnīt there a datasheet, design note, manufacturer information?

    Klaus
  21. Replies
    19
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    774

    Closed: Re: I/O banks in an FPGA. Is it important for routing?

    Hi,


    That's a good idea in any case.


    I never have worked with MAX10, thus I don't know the answer.
    But I'm sure you find the answer in the datasheet.

    Klaus
  22. Replies
    2
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    311

    Closed: Re: Uart Interrupt for data Reading

    Hi,

    And where exactly is the problem?

    You surely have done some internet research, found some code and tested it.

    Show us this code, show us your test conditions, show us your expectations...
  23. Closed: Re: Unsure about this current sensor for use in saturation current measuring circuit.

    Hi,

    It seems you don't need isolation.
    If so, then - in my eyes - the best method to measure currents in tge given range is a shunt ... added with a suitable amplifier.
    There are even dedicated...
  24. [SOLVED]Closed: Re: calculating capacitance of transistor gates

    Hi,

    I'm not sure what your question is...

    The output capacitance is acting as miller capacitance, thus ...
    * Although the voltage at the gate changes only about 15V
    * the voltage at the...
  25. Replies
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    1,979

    Closed: Re: Differential probe build

    Hi,

    The circuit in post #45 shows the problem (V9) as well as the solution (voltage divider to GND).

    Klaus
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