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Type: Posts; User: KlausST

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  1. Replies
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    63

    Closed: Re: Measuring Voltages using MCU

    Hi,


    I donīt agree.
    I always measure VAC directly (DC shifted) with the MCU.
    AC voltage is defined as V_RMS which takes care about waveform.
    Rectified AC canīt care about waveform and thus...
  2. Replies
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    Closed: Re: Output of Variable gain amplifier?

    Hi,


    V_out = V_CM + V_offset * gain
    (Where V_offset is the combination of V_offset (datasheet) + I_bias * R_input)

    ***
    Btw:
    Why do you design a "VGA" and then use external feedback...
  3. Closed: Re: minimum depth for data streaming through async fifo

    Hi,

    even "locked" clock signals will move.

    But how much?

    It depends on
    * the stability of the input clock
    * the division and multiplication factors (if analog PLL)
    * the lock mode
  4. Closed: Re: How to make a 5V negative supply using the LM2576 regulator

    Hi,

    is there any question?
    Otherwise it should be moved to the "Show your DIY" section.


    The problem is the bad GND wiring.

    If youīre not that experienced --> use a two layer PCB with...
  5. Replies
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    Closed: Re: Learning C programming of 8051

    Hi,

    my personal opinion:
    If you want to learn C for ARM, then I see no need to learn other microcontroller first.


    Klaus
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    Closed: Re: MCP3918 front end design

    Hi,

    hard to say without information from your side.
    Often: yes.

    Klaus
  7. Replies
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    81

    Closed: Re: Learning C programming of 8051

    Hi,

    Sorry I canīt give you an answer to your question.

    But I think the 8051 are outdated now - although still widely used.
    But there are more modern microcontroller, cheaper, faster, more...
  8. Closed: Re: Best microcontroller for WPA2 Enterprise connection?

    Hi,


    Then 2 additional bytes sufficient!?

    Klaus
  9. Closed: Re: Best microcontroller for WPA2 Enterprise connection?

    Hi,

    You already know that memory is low... but the same time miss to tell how much memory you need.

    Klaus
  10. Replies
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    Closed: Re: torque screw instead of ring terminals

    Hi,

    manually tinned wires are a no-go for reliable and especially for high current connections.
    The tin is weak and will loose contact force with time.

    The best are crimped contacts - but only...
  11. Closed: Re: Proper undervoltage lockout for battery powered device

    Hi,


    Depending on battery chemistry you may go lower with the OFF threshold..
    But why switch ON with that 300mV small hysteresis, this means about no energy hysteresis in the battery.
    It may...
  12. Replies
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    Closed: Re: LTC4211 not conducting

    Hi,

    Sorry, I can't follow all your description.

    Please show your schematic,
    your PCB layout and
    a detailed description of the applied and measured signals.

    Klaus
  13. Replies
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    Closed: Re: LGA-12 footprint design

    Hi,

    You talk about soldering problems?
    False disconnect?

    Klaus
  14. Replies
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    160

    Closed: Re: LGA-12 footprint design

    Hi,


    What trouble?

    Klaus
  15. Replies
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    [SOLVED]Closed: Re: Negative VCO transfer function

    Hi,


    I don't think so.
    Please check low pass filtered XOR output vs phase_shift.
    --> You will see it has equal positive as well as negative slope.
    Thus the input polarity does not care. Even...
  16. Closed: Re: How to design an class d output filter ( active filter )?

    Hi,


    1) choosing the right devices may not significantely drop the efficiency
    2) compared with the OP's solution to use an active filter --> the efficiency of the class D amplifier becomes...
  17. Closed: Re: Temperature to voltage or 1wite digital converter with high presicison?

    Hi,

    Don't compare apples and oranges.
    You forgot to calculate the ADC and the VoltageRef:

    For your cost calculation:
    * temp_to_voltage + ADC + voltage reference
    * or digital one wire

    You...
  18. Replies
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    Closed: Re: Good PCB Layout Designers

    Hi,

    For sure it's possible to pass EMC test with 2 layers.
    I've done it many times. But it needs to know about the crutical current loops, enclosed area of the loop, frequencies.
    Proper...
  19. Closed: Re: PCB design and schematic for a half bridge power amplifier.

    Hi,

    My pcb layout recommendation.
    * use one side with GND copper pour, with at least as possible other traces.

    Please show the complete schematic.

    Klaus
  20. Closed: Re: How to design an class d output filter ( active filter )?

    Hi,

    Just use a passive filter. It should be calculated according real used load impedance.

    Klaus
  21. Replies
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    Closed: Re: Regarding ARM micro controllers

    Hi,

    ... itīs like: "Iīm planning to learn sports" ... A wide range: from chess, referee, athletics ... to MMA.
    Where to start? Donīt say: ballet ;-)


    Klaus
  22. Replies
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    Closed: Re: Regarding ARM micro controllers

    Hi,

    I canīt give a suggestion.

    Generally:
    If you ask for a suggestion without providing any information what you want to do with it.... leads to random suggestions.
    Every member will give...
  23. Closed: Re: Low Side bidirectional battery disconnect switch

    Hi,

    Aren't the IGBTs Ron higher than the desired values?!

    --> Please tell us your "desired values"

    Klaus
  24. Replies
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    Closed: Re: 2nd line content extract SIM900A

    Hi,

    search through the text and find the "linefeed" chracter

    Klaus
  25. Closed: Re: Low Side bidirectional battery disconnect switch

    Hi,

    you may use a solid state relay, or photoMOS, or a mechanical relay.

    You know: You didnīt give any specification about voltage, current, speed....thus we can only guess.

    Klaus
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