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Type: Posts; User: KlausST

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  1. Closed: Re: Real time voice encryption/decryption with FPGA

    Hi,

    You need on the receiver side a FIFO and some kind of PLL to synchronize to the incoming data stream.

    Klaus
  2. Closed: Re: Use of this resistor in oscillator of Stm32f429zit6 Discovery development board

    Hi,

    With the use of this resistor you may optimize on start up time or you may optimize on power consumption.

    The resistor is not mainly related to the microcontroller but to the used XTAL.
    ...
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    Closed: Re: Multiple AC inputs relay (light PLC)

    Hi,

    You never mentioned analog inputs before.
    What do you need them for?

    Klaus
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    Closed: Re: STM32F3 built-in opertion amplifier

    HI,

    Indeed even Rail to Rail Opamps don't go to the rails.
    There always is a dropout voltage ... in this case 100mV to each rail.

    Klaus
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    Closed: Re: Multiple AC inputs relay (light PLC)

    Hi,

    PLC .., I have not much experience.. but a Siemens LOGO! with an I/O extension should work.

    There are different types available. Some run with 230V AC power, with/without display,...
  6. Closed: Re: LTspice Wolfspeed mosfet model doesn't seem to be working

    Hi,

    try to connect V1 Minus directely to GND instead of KS.

    Klaus
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    Closed: Re: HX711 mV/V information needed

    Hi,

    For 0.001 you may multiply with 1000, then do the rounding to integer, then divide by 1000
    For 0.002 ... multiply with 500
    For 0.005 ... multiply with 200

    But I assume there are better...
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    Closed: Re: Subtract two dc voltages.

    Hi,

    Maybe it's time to start to give useful and complete informations.
    It's neither clear what you need , nor what voltages and currents you are talking about.

    Klaus
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    Closed: Re: Subtract two dc voltages.

    Hi,


    Thank you for the feedback. I made a mistake. I should be:

    A 9V battery and a 1.5V battery. Connect the PLUS of the 1.5V battery to the PLUS of the 9V battery. Use a voltmeter, connect...
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    Closed: Re: Class B wave form problem

    Hi,

    At high frequencies you most probably see the capacitive coupling from base to emitter.
    I assume this also works without supply. It's passive.

    The active circuit - at low frequencies - is...
  11. Closed: Re: Why Z and Y matrices must be pure imaginary for reciprocal lossless N-port juncti

    Hi,

    Maybe I don't understand the question.
    My answer is: for "lossless" you need "imaginary", because "real" means "loss".

    Imaginary: pure lossless capacitors and lossless inductors. No...
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    Closed: Re: Master slave connection

    Hi,

    You really ask if there are screw terminals?
    For sure there are.
    They are used for decades of years now and million times every day.

    More modern are spring clamps.

    Btw: I can't remind...
  13. Closed: Re: How to add the outputs of a different voltage double ciruits

    Hi,

    Omit the upper GND (symbol).
    Connect the lower end of R1 with the upper end of R1.

    Klaus
  14. Replies
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    Closed: Re: Subtract two dc voltages.

    Hi,

    What's the problem?
    Mathematics? Just subtract the values: Example: 9V - 1.5V = 7.5V

    Hardware? Reverse connect the second one: example: A 9V battery and a 1.5V battery. Connect the MINUS...
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    Closed: Re: Master slave connection

    Hi,

    What exactly is the problem?
    Either each cable hase a 3 pin connector. D+, D-, GND. And all D+ are joined...as weel as D- and GND

    Or you have three terminals where all 6 D+ are connected...
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    Closed: Re: Error in subtraction with 2's comp method

    Hi,


    Please tell us what is wrong. Tell us the result and tell us carry.


    Show us your hardware, schematic, code, or whatever you have.


    Did you do the calculation step by step on your...
  17. Closed: Re: LTC4020 not regulating, blowing sense resistors during debug

    Hi,

    Did you try to use the I_limit feature?
    Try it. Start with very low current ... then increase.

    Show us your PCB layout and a detailed photo of the circuit.

    Klaus
  18. Closed: Re: Calculating switching losses of a mosfet when switching energy is not given

    Hi,

    As with many electronics topics:
    MOSFET manufacturers provide application notes how to calculate this.
    Those application notes from big semiconductor manufacturers are for free, reliable and...
  19. Closed: Re: Calculating switching losses of a mosfet when switching energy is not given

    Hi,

    Let's say you have a Mosfet with 50% duty cycle, average drain current of 10A and average drain-source voltage of 10V.
    Then the power dissipation may be from about zero (let's say 0.1W) up to...
  20. Closed: Re: Calculating switching losses of a mosfet when switching energy is not given

    Hi,

    It depends what values you use

    P(t) = V(t) × I(t)

    But P(avg) is not V(avg) × I(avg)
    And P(RMS) is not V(RMS) × I(RMS)

    Klaus
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    Closed: Re: AD8428 Comon mode issue(?)

    Hi,

    Your circuit really needs improvement.

    It really makes no esns to use a 0.1 Ohms resistor as shunt, which guves a very tiny output voltage .... then amplify thus tiny voltage with a gain of...
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    Closed: Re: Forward voltage of blue 3 mm led

    Hi,


    Yes, I know, that's the problem.

    But there are many blue LEDs, and every manufacturer provides datasheets.
    Just go through a couple of them to see how much the values differ, or how good...
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    Closed: Re: Forward voltage of blue 3 mm led

    Hi,

    Why not
    * look into a datasheet
    * measure it
    by yourself?

    Klaus
  24. Closed: Re: Sine PWM calculated with pic, instead of using table

    Hi,

    PWM = pulse width modulation
    HPWM .... never heared about it.....you mentioned it for the first time now.

    PWM can be made with software, but very most nowadays microcontrollers have built...
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    Closed: Re: Multiple relay with controllers

    Hi,

    Are you aware that you didn't show the 470 resistor in your schematic?

    Generally you are free to use as many resistors you like.
    The only thing you have take care is to satisfy the...
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