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Type: Posts; User: KlausST

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  1. Closed: Re: Send multiple data to HTTP server through GET method using sim900a

    Hi,

    Sending to server is usually done with POST, not with GET.

    Klaus
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    Closed: Re: MOSFET Gets Hot in H Bridge

    Hi,

    As already said: high duty cycle makes things worse.

    Show us scope pictures (HIN, 12V directly at the driver, highside_out, 24V supply) and a photo of your circuit, including the scope...
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    Closed: Re: How to control a electric magnet

    Hi,

    You know: for electrical designs you need electrical specifications.

    Now I try to summarize your given information:
    * functional generator, sinewave. (No voltage, no current)
    * electric...
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    Closed: Re: MOSFET Gets Hot in H Bridge

    Hi,

    I recommend to increase the value of C1, C4 to be at least the value of C2, C5.

    Imagine: every time when the bootstrap capacitors C2, C5 are charged, the energy needs to come from C1, C4....
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    Closed: Re: How to control a electric magnet

    Hi,

    It's done many million times: and audio speaker and an audio amplifer.
    So why don't you use this system?

    Klaus
  6. Closed: Re: Electronic Load Circuit for 380 Vdc (2A to 3A) Power Supply

    Hi,


    In which regard?
    Cost --> no
    Ruggedness --> no
    Size --> no
    Power dissipation --> no

    Klaus
  7. Replies
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    [SOLVED]Closed: Re: mosfet totem pole voltage

    Hi,


    A Mosfet does not know about it's counterpart, a Mosfet dies not know about GND potential (as long as none of the three legs is directly connected to GND), it just sees the voltage...
  8. Closed: Re: Impact of parasitic capacitance and parastic inductance on DC and crystal oscilla

    Hi,

    A capacitor at the DC power supply is a benefit in either case.
    It stabilizes the supply voltage while it has no negative influence on EMI/EMC ...
    It rather improves EMI/EMC.

    Klaus
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    Closed: Re: LTC4020 component selection

    Hi,

    If CSOUT output impedance really is 100k, then an external capacitor will reduce output bandwidth .....then I have to admit that an Opamp as buffer might work.

    But a single Opamp circuit,...
  10. Closed: Re: P mosfet turns on/voltage at drain during powerup

    Hi,


    I often have a capacitor between gate and drain. Especially for a power distribution switch it prevents from fast switch ON of the load.
    In combiniation with the drive resistance it...
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    Closed: Re: LTC4020 component selection

    Hi,

    Your current measurement:

    First: standard signal flow at a schematic schould be from left to right.

    The first Opamp (right side in your schematic) gets high frequency input. But the...
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    Closed: Re: MOSFET Gets Hot in H Bridge

    Hi,

    A similar discussion a couple of weeks ago.
    https://www.edaboard.com/showthread.php?385579-LM741-Amplifier-not-working-with-IR2110-IC-PROTUES&p=1656458&viewfull=1#post1656458.

    Klaus
  13. Closed: Re: P mosfet turns on/voltage at drain during powerup

    Hi,

    * defective scope probe
    * bad solder joint
    * wrong scope setup AC/DC

    Klaus
  14. Closed: Re: Impact of parasitic capacitance and parastic inductance on DC and crystal oscilla

    Hi,

    With DC ... neither capacitance nor inductance has an effect.

    But then you talk about oscillator ... which can not be DC.

    So are you talking about the DC power supply signals of an...
  15. [SOLVED]Closed: Re: Is this a good circuit that I have designed?

    Hi,

    glad to see it's solved.

    In case this is a high volume project and you want to safe cost, you may optimize:

    Since the MAX7219 is able to drive 8 digits x 7 (8) segments .... it should be...
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    Closed: Re: Delay Relay Help Needed

    Hi,

    B needs a turn ON delay
    A needs a turn OFF delay

    Klaus
  17. 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
  18. 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
  21. Replies
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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,...
  22. 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
  25. Replies
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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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