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Type: Posts; User: KlausST

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  1. Replies
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    Closed: Re: USB Core and USB Architecture

    Hi,

    first please explain why you posted in the "RF, Microwave, Antennas and Optics" section.

    To your question:
    Again a very unelaborated question. I assume nobody can help you when you dont...
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    Closed: Re: Help identify the item

    Hi,


    but you also wrote:


    ..what about a hand drawn sketch or a photo...

    Klaus
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    Closed: Re: ESD protection for Aruduino Input Pins.

    Hi,

    sadly you missed to give values. Values with units we can calculate with.


    Makes no sense for me. -->schow your schematic.


    No timing information .. besides the "once a minute". This...
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    Closed: Re: Project using Opamps-intermediate level

    Hi,

    personally I dont like analog multipliers, Id rather use the digital solution. Thus Im not an expert in this area.
    But if I had to do analog multiplication Id use ready to buy "analog...
  5. Closed: Re: ACS722 Hall sensor IC...minimum loading for output signal voltage pin?

    Hi,

    minimum load resistance means maximum load current.

    --> use a load resistance >= 4k7

    Klaus
  6. Closed: Re: Does ST MC Workbench implement Space Vector Pulse Width Modulation (SVPWM) ?

    Hi,

    SVPWM is an algorithm, it is firmware, processed by the microcontroller.
    So everything is available but the code. The code is your job.

    Or do I misunderstand your question?

    Klaus
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    Closed: Re: Discharge circuit, dump circuit

    Hi,

    A forum is not meant to do others jobs. It is meant to help to rectify mistakes.
    If you want others do your job you should post in the "jobs section" and consider to pay for the job.

    Klaus
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    Closed: Re: ESD protection for Aruduino Input Pins.

    Hi,

    First define the valid voltage levels: V_IH, and V_IL, not the arduino levels, but the 20/24V levels.
    And define the valid timings.
    Then the maximum erroneous signals. In volts, time,...
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    Closed: Re: higher output frequency with PCA9685?

    Hi,


    You may say "not correct"...
    but I did just a general calculation of the required minimum input frequency .. (for any digital PWM generation, not only MAX9685)
    and if the minimum required...
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    Closed: Re: higher output frequency with PCA9685?

    Hi,

    simple calculation:
    50kHz PWM frequency x 4096 (12 bits resolution) = 204,800kHz = about 205MHz input clock.

    Answer: not possible.


    Klaus
  11. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Hi,

    Issues:

    * The gate voltage is meaningless (as mentioned in posts before, several times)
    * you can't calculate the gate current from the gate voltage (at least not in a usual way)....
  12. Closed: Re: Sampling Bandwidth vs. Bandwidth in Tracking Mode of a Sample/Track and Hold

    Hi,


    Undersampling...

    Many RF systems use undersampling technique.
    If interested: do an internet search.

    Klaus
  13. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Hi,


    Quite confusing statement.
    "I can't control the amount of voltage that goes to the gate" --> no comment
    "thus I can't control the amount of current" --> why not?
    "which should be...
  14. Closed: Re: Is it possible to repair this touch Screen FCP Cable?

    Hi,

    For sure you may design an identical flexprint.

    Klaus
  15. Closed: Re: Why and how is PWM implemented in Field Oriented Control (FOC) ?

    Hi,


    To say it with your wirds: PWM can alternate between high and low voltage, not current.
    But current is different than voltage, since the motor winding is an inductance.
    So the current...
  16. Closed: Re: Is it possible to repair this touch Screen FCP Cable?

    Hi,

    Difficult to repair.
    What about buying another defective monitor of same type?

    Klaus
  17. Replies
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    Closed: Re: Pulse power dissipation in a BJT

    Hi,

    Yes, I agree with schmitt trigger.
    Most transistor datasheets show an SOA chart.
    I expect no big problem... but refer to the datasheet.

    Klaus
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    Closed: Re: Testing station/ area design

    Hi,

    I have no idea what voltage (range) you are talking about... and AC or DC... what is your "area"? (isolated, earth grounded?)
    What is meant by "doing testing"? Tetsing what? under which...
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    Closed: Re: Testing station/ area design

    Hi,

    please explain in detail what you mean with "safety".

    6A will limit the load current...but it wont protect you against electric shock. In worst case even 25mA may cause your heart to get...
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    Closed: Re: SRAM RC Extraction Simulation

    Hi,

    It's like a bus keeper circuit.
    It holds the last state of the (input) line.

    Klaus
  21. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Hi,


    Form the previous discussion you already should know that 1) not useful ... at least problematic
    2) is good for analog phase angle control
    4) is good for digital phase angle control

    I...
  22. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Hi,

    Eventually we see the voltage at the capacitor rising until the diac triggers.
    But - according datasheet - I can't see why it should stay at 22V. I don't even expect near 22V.

    Out of...
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    Closed: Re: LT3083 lab PSU question

    Hi,

    Posting a schematic from a datasheet is useful to discuss the correctness of this schematic.

    But I assume this schematic is correct ... and there is some mistake in your circuit.
    Thus it...
  24. Closed: Re: Waht is the name of ATX connector on motherboard?

    Hi,

    I did an internet search "atx power supply connector type".

    And guess what: The first hit gave manufacturer and exact type of the connector.

    Try it on your own

    Klaus
  25. Closed: Re: Please help me avoid a disaster with my first pcb

    Hi,


    As a raw rule: put a decoupling capacitor at each power supply pin of every IC.
    For sure, if the modules have integrated Cs, you may omit additional ones.

    And a capacitor on one end of a...
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