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Type: Posts; User: KlausST

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  1. Replies
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    Closed: Re: Power Oring Using Mosfet

    Hi,


    Without the resistor the node is called "floating". (No predictable current flow through either diode)
    The voltage of floating nodes is undetermined.
    When you measure the voltage of a...
  2. Closed: Re: XC9572XL-10VQG64I part number of CPLD, does it need to program or can use directl

    Hi,

    It's clearly a "user programmable device" --> for sure you need to program it.
    Only the manufacturer of the (defective) device knows the exact function.
    Unless you bought a pre programmed...
  3. Replies
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    458

    Closed: Re: BJT amplifier design

    Hi,


    Yes, and there is an almost identical parallel thread ...with modified values.

    @OP:
    Show what you have done so far. Your hand made schematic, calculations, ideas...
    Tell us what does...
  4. Replies
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    251

    Closed: Re: AC-DC power supply design

    Hi,

    I don't think that a 2200W power supply with just rectifying the input to a capacitor bank is according nowadays rules.
    I'd use a PF stage with soft start to smoothly charge the capacitors.
    ...
  5. Replies
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    1,504

    Closed: Re: Ferrite bead usage in ADC's

    Hi,

    Go to the AD1955 site (not EVAL).
    Or just type "AD1955" into the search of analog.com and you will find "UG-48 ..."
    That's it

    Klaus
  6. Replies
    5
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    257

    Closed: Re: load sensing circuit/relay

    Hi,

    I assume there are ready to buy solutions. Like "master slave power cords". I use one of such things to switch ON/OFF my periferals if the PC.

    I don't want to design your complete...
  7. Replies
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    345

    Closed: Re: USB current negotiation

    Hi,

    You are correct. My copy and paste fault.

    It should be: MAXIM USB CHARGER DETECTORS.
    https://www.maximintegrated.com/en/products/interface.html ... scroll down to the technical documents...
  8. Closed: Re: Voltage input to BLDC inverters on tethered drone?

    Hi

    Which RPM?
    I used a milling motor for 400V, but also 400Hz which makes 24.000 RPM.
    I'm not sure... I assume this is an asynchronous milling motor.

    Klaus
  9. Closed: Re: Voltage input to BLDC inverters on tethered drone?

    Hi,


    I agree.
    You may apply a lot of DC current to a BLDC motor ... while generating zero torque.
    But if you apply a rotating field to a BLDC motor with the correct amplitude, and the motor is...
  10. Closed: Re: three phase volt measurement using resistor network method

    Hi,

    I guess the problem is in the schematic.Maybe floating inputs (digital or analog), noisy supply voltage, noisy reference voltage, unsuitable anti aliasing filters, pushing negative voltages...
  11. Closed: Re: three phase volt measurement using resistor network method

    Hi,

    327 lines of undocumented code. Thanks for this riddle.

    You want us to find the error around "AN0" but there is no "AN0" in your code.

    "Three phase" makes me assume you talk about "AC"...
  12. Replies
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    Closed: Re: Oscillations dying out

    Hi,

    Replace C15.

    Joke aside. How do you think we can help when you don't give a single information about your hardware? By guessing?
    --> give complete informations. Like schematics, PCB...
  13. Replies
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    1,504

    Closed: Re: Ferrite bead usage in ADC's

    Hi,

    You don't want high currents between GNDs on a die. Thus the chip designers use a relatively high ohmic path ... just to avoid high voltage difference.

    The PCB designer needs to design a...
  14. Closed: Re: Frequency Generator XR-2206 PCB Design Missing Components

    Hi,


    Most of them are standard parts, like the pinhead connectors. I'm sure there are libraries for them.

    But if you don't find, then do what is the most obvious (and already suggested in...
  15. Replies
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    687

    Closed: Re: Easiest way to get 5v and ~1V

    Hi,


    Like every electronics designer you need to read datasheets.
    Then you know about wiring.

    Did you read a bout the currents?
    * An 7805 is able to supply more than 3000 of MCP601 Opamps....
  16. Closed: Re: Motor pump starter connection with two relay to operate manual and auto

    Hi


    You may use another single pole relay..

    Klaus
  17. Replies
    5
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    345

    Closed: Re: USB current negotiation

    Hi,

    It took me 5 minutes to find MAXIM's USB Host Adapter Emulators
    They may or may not have I2C. Some may have, but you don't need to use it (as stand alone solution)
    Other manufactureres have...
  18. Closed: Re: Motor pump starter connection with two relay to operate manual and auto

    Hi,


    The benefit of standard symbols is that it avoids confusion.
    Is it more simple to insert a picture with a red box than inserting a symol of a switch?

    As far as I can see:
    * starting...
  19. Replies
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    Closed: Re: Easiest way to get 5v and ~1V

    Hi,

    Capacitor for -IN:
    * X7R are used for high current peaks and/or high frequency..because they have low ESR (at high frequencies)
    But at this nod there neither us high current, nor high...
  20. Closed: Re: Motor pump starter connection with two relay to operate manual and auto

    Hi,

    Honestly... I don't understand the wiring.
    * What's the red box and the green box?
    * Where is the motor?

    Klaus
  21. Closed: Re: ADC Value gets changed when a Digital output enables

    Hi,

    Impossible to help without schematic and PCB layout / wiring.

    My guess: ground bounce.

    Klaus
  22. Replies
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    687

    Closed: Re: Easiest way to get 5v and ~1V

    Hi,

    No need for making it complicated.
    Try this.
    157386

    Klaus
  23. Replies
    5
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    345

    Closed: Re: USB current negotiation

    Hi,

    The most important is: you need a USB DCP which can supply 1.5V.
    There is the USB specification, various application notes and forum discussions. What else do you need?

    And for sure there...
  24. Replies
    20
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    687

    Closed: Re: Easiest way to get 5v and ~1V

    Hi,

    True, the diode solution will be an improvement for noisy supply voltages.
    The drawback is the known temperature drift of about -4.2mV/°C.

    If you are interested in low temperature drift,...
  25. Replies
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    687

    Closed: Re: Easiest way to get 5v and ~1V

    Hi,

    1) you are right ... and not.
    * Your second circuit shows one capacitor. Just for the function and as low pass filter.
    * My circuit shows a second capacitor, because all noise at +IN node is...
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