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  1. [SOLVED]Closed: Re: dual NPN and a Diode driveing a P-Channel MOSFET

    Hi,

    I see.

    But you need to take the overall cost into consideration.
    * assembling cost for 8 additional parts
    * increased board size
    * stock costs
    * purchase costs
    * increased failure rate
  2. [SOLVED]Closed: Re: dual NPN and a Diode driveing a P-Channel MOSFET

    Hi,

    Not that bad.
    But a lot of effort.
    There are high side power switches ... with additional features.
    Maybe something like this: NCP45524I

    Klaus
  3. Closed: Re: Simple CMOS Analog Square-Rooting and Squaring Circuits

    Hi,

    I opened the document, but didnīt go deeper in the formula.. So I canīt give an answer.

    More than 20 years ago I had to design an analog multiplier circuit .. with ready to buy device. I...
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    Closed: Re: Discharge circuit, dump circuit

    Hi,

    an SCR is made for AC operation (at least the current needs to go down to zero periodically), it canīt be used for DC this way.
    And an SCR canīt be (usefully) controlled by a PWM signal.
    ...
  5. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Hi,

    we are now at over 100 posts in this thread .. and still talking about the very basics of electronics. Voltage, current, resistor, capacitor....

    Thus my well meant recommendation:
    If you...
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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 donīt...
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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 donīt like analog multipliers, Iīd rather use the digital solution. Thus Iīm not an expert in this area.
    But if I had to do analog multiplication Iīd use ready to buy "analog...
  10. 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
  11. 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
  16. 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)....
  17. 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
  18. 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...
  19. Closed: Re: Is it possible to repair this touch Screen FCP Cable?

    Hi,

    For sure you may design an identical flexprint.

    Klaus
  20. 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...
  21. 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
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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 wonīt 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
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