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Type: Posts; User: KlausST

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  1. Closed: Re: Ramping a reference voltage up from, or down to zero volts, over ~200us

    Hi,

    15 equal resistors in a string connected to GND and Vref.
    Connect a 16:1 analog mux to each tap, including GND and Vref.
    Control the 4 MUX digital inputs in counter style UP and DOWN.
    (15...
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    Closed: Re: Help understanding solar battery use

    Hi,

    I won't do simple + - × ÷ math for you....

    Energy = power x time.

    I assume you are able to calculate the energy stored in the battery by your own.
    Now divide it by the load power to get...
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    Closed: Re: Back EMF Bldc zero crosiing detection

    Hi,

    Some time ago I've read through some good application notes about this.
    I don't have the links by hand, but they should not be hard to find with an internet search.

    Klaus
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    Closed: Re: AC-DC power supply design

    Hi,

    I'd use a PFC stage not only becasue of power factor correction or mains quality.

    I'd use it because it solves the problem with charging high value capacitors.
    There are many ready to buy...
  5. Closed: Re: Circuitry to make Paralleled Buck converters share current.

    Hi,

    One idea is to use one master and all others as slave.
    The master does the voltage regulation (loop) ....and measure it's own current.
    It passes the "current information" to the slaves .....
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    Closed: Re: Addressable speaker system

    Hi,

    If you need further help, please provide useful informations focussed on the problem.

    RS485 is a very reliable data interface. Used million times in the industry over many hundreds of...
  7. Closed: Re: How to connect VFD to a laptop or computer?

    Hi,

    I do know neither this VFD nor the software, thus at first I'd read the manuals.

    Klaus
  8. Closed: Re: How to choose optimal wire width of spiral coil to attain high q factor?

    Hi,

    High Q means low loss.

    What are the losses in a coil?
    * core loss --> choose a core that is suitable for frequency and flux
    * ohmic winding loss --> choose wires with high (overall) wire...
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    Closed: Re: ZYNQ Power Requirement

    Hi,

    Like with all electronic devices: It's written in the datasheet.
    In the section: Recommended Operating Conditions

    Klaus
  10. Closed: Re: Divide-by-1 clock divider through D flip-flops

    Hi,

    Divide by one means "no operation at all"
    Output = input
    Useless function

    For such a useless function you may use a
    * buffer
    * AND gate (both inputs tied together)
    * OR gate (both...
  11. Closed: Re: Microcontroller selection - higher baud rate

    Hi,

    There are XTAL frequencies for UART operation, like 3.6864MHz or 7.3728MHz

    You can't generate them by PLL "multiply with 2 or 4" from a 8MHz XTAL frequency.

    The mathematical solution is:...
  12. Closed: Re: Control a switch by microcontroller 16F877a

    Hi,

    Millions of schematics for a simple transistor - relay - control are available in the internet.
    Every detail of design is explained may thousand times.

    I wonder how much time you spent to...
  13. Closed: Re: Freq computation without DIV instruction for 8bit MCU

    Hi,

    LUT does not neccessarily be in SRAM.

    But an integer division should be fast. But without ranges...accuracy, resolution...

    Klaus
  14. Closed: Re: Freq computation without DIV instruction for 8bit MCU

    Hi,

    40us?? Why that much time?

    Floating point? --> try integer solutions (what input values range, what expected calculation resolution and accuracy?)
    What microcontroller, what clock...
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    Closed: Re: Addressable speaker system

    Hi,



    UART is just a name for the interface, but it does tell nothing about
    * signals (optical, voltage, frequency modulation, single ended, differential, RS232, RS422)
    * wiring (single wire,...
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    Closed: Re: GND For Connector Shielding

    Hi,

    ESD? No. This is electrostatic discharge.

    EMC. Electromagnetic compatibility.
    A metal case should be considered as a faraday cage. Where the whole case should have the same voltage at any...
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    Closed: Re: Addressable speaker system

    Hi,

    Yes, I aslo vote for UART.
    The PWM needs to be continuos ... maybe causing annoying crosstalk to audio...and for sure more difficult to decode.

    Klaus
  18. Closed: Re: Microcontroller selection - higher baud rate

    Hi,

    If you use (non UART standard) XTALs, then it's almost independent of microcontroller (as long as they don't include a PLL).
    Because the usual way to generate baude rate is to integer divide...
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    Closed: Re: AC-DC power supply design

    Hi,


    9A RMS .... is the optimum value and only true for non phase shifted pure sinusoidal signals.

    For a rectifier - capacitor solution the RMS current (which is responsible for heating of the...
  20. [SOLVED]Closed: Re: MAX232 alternative with more lines in single package

    Hi,

    I'd use the selection guides or tables provided by IC manufacturers or distributors...

    Klaus
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    Closed: Re: AC-DC power supply design

    Hi,

    Infineon has a lot of ICs and application notes.
    ...
  22. Closed: Re: Microcontroller selection - higher baud rate

    Hi,

    I assume every PIC and AVR microcontroller can go higher than 115200 baud.
    Just review the datasheets.
    For sure it depends on the microcontroller's system clock frequency.

    Klaus
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    Closed: Re: Wht is the purpose of this op amp

    Hi,

    Low pass filter, first order, 38Hz
    Voltage follower to reduce impedance
    I assume R36, R26 are just there to ensure zero output voltage in case of disconnected input signal, or no supply...
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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...
  25. 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...
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