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Type: Posts; User: KlausST

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  1. Replies
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    Hi,


    Nobody wold build a house on weak surface with unsuitable material to test it's quality. Then build the real house with completely different conditions.
    My recommendation: Do the tests on a...
  2. Replies
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    Closed: Re: Repeat Cycle using timer application

    Hi,

    I don't understsnd your code ... I'm not that experienced with C

    But generally the ISR code should be as short as possible.
    You do a lot of stuff in the ISR.
    Most of it can simply be...
  3. Replies
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    Hi,



    How can you "make" this smps without having a schematic?
    Did you even read the IC's datasheet and application notes?

    PCB without GND plane, and a PCB layout that seems not to comply...
  4. Closed: Re: Rise times and fall times of fast transistors seem way too long

    Hi,

    400MHz is for small signal (non saturated) analog mode....where the gain = 1
    60ns is for large signal, saturated, switching mode.

    Two completely different situations.

    Klaus
  5. Closed: Re: Question of the circuit to transmit external signal to a smartphone app

    Hi,

    You give more riddles than informations.

    Define:
    * proximity sensor
    * Arduino
    * modifying the firmware
    * control signal
    * what you want to achieve at all
  6. Replies
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    Closed: Re: Piezo preamplifier missing cap values

    Hi,

    In most cases fc = 1 / ( 2 × Pi × R x C) applies.
    R3, R4 act as a voltage divider, thus for C2 2.55k applies.
    Choose fc to be very low, much lower than 10Hz.

    C3 should be tge same as C7,...
  7. Replies
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    173

    Closed: Re: Circuits for P, PI and PID controllers

    Hi,

    Especially for PID controllers, how to design them, how to tune them...there are countless design notes, application notes, discussions, even a lot of videos.There are many good ones. Look for...
  8. Closed: Re: Please help power supply dead 110V to 24vdc 5vdc

    Hi,

    Seems to be something basic.
    Maybe FS1 is a fuse and is blown ...
    Unpower your circuit and check continuity of FS1.

    Klaus
  9. Replies
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    Closed: Re: impedance of antenna

    Hi,


    No. It has nothing to do with antenna material. At least it should not...

    Klaus
  10. Replies
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    Closed: Re: impedance of antenna

    Hi,

    50 Ohms is the characteristic impedance, you can not measure with an Ohmmeter.
    The load impedance does not belong to the antenna. It is for impedance matching, for
    maximizing the output...
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    Closed: Re: Improve thermal path on 8-Lead Plastic

    Hi,

    I assume there are so much parameters. (PCB material, thickness, copper thickness, layer stacking, layer count, air flow...)
    ..it's hard to discuss without details..

    I'd start with the...
  12. Closed: Re: Question of the circuit to transmit external signal to a smartphone app

    Hi,

    The linked site tells you everything you need to know.

    What additional information do you need?

    Klaus
  13. Replies
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    1,641

    Closed: Re: how to boost microvolts to higher voltages?

    Hi,

    Every Opamp manufacturer provides such documents.
    Start with the datasheet of the selected Opamp. Go to the manufacturer of the Opamp.. to the site of the selected Opamp. Usually there is a...
  14. Replies
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    1,641

    Closed: Re: how to boost microvolts to higher voltages?

    Hi,


    It depends on a lot of things.
    Power supply, power requirements, noise expectations, the chosen Opamp....

    Often the datasheet and application notes gives hints.
    For a more detailed...
  15. Replies
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    1,641

    Closed: Re: how to boost microvolts to higher voltages?

    Hi,


    Yes, with tye suitable combination of Opamp and buffer.

    But I call it stupid ... to add a buffer instead of using meaningful resistor values.
    An additional buffer may add stability...
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    Closed: Re: radar for object detection

    Hi,

    In a forum ... you should show what you have done...
    and how you tested it, what you expected and what you see instead

    Klaus
  17. Closed: Re: Different current measurmen numbers on a FLUKE 289

    Hi,

    Last page of the datasheet tells the burden resistances in current measurement mode.
    It is 102 Ohms vs 1.8 Ohms ... does not explain your results.

    Can it be you overloaded the uA range...
  18. Replies
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    Closed: Re: how to boost microvolts to higher voltages?

    Hi,


    This is your mistake.
    On a dual supply Opamp none of the supply rails is GND.... (with standard node naming)

    Klaus
  19. Replies
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    Closed: Re: Two tone nonlinear simulation in ADS

    Hi,

    I'm no HF specialist, but afaik Fspacing depends on the input (data) frequency.

    Klaus
  20. Closed: Re: Different current measurmen numbers on a FLUKE 289

    Hi,

    What's the resistor value?
    Show a photo how you connected it.
    AC or DC?
    If AC: is the Voltmeter trueRMS or not? What waveform?

    970 ohms vs 1884 ohms ... this means a difference of more...
  21. [SOLVED]Closed: Re: Ultra low-power timer to make a power saving circuit

    Hi,

    As far as I know .. every microcontroller acts this way.
    Idle state does not mean power off ....

    Klaus
  22. Replies
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    Closed: Re: how to boost microvolts to higher voltages?

    Hi,


    No.
    A dual power supply has three connections (at least).
    +voltage, GND (or 0V), -voltage.

    GND is the reference to each of the dual supply outputs as well as the referenc for your...
  23. [SOLVED]Closed: Re: Ultra low-power timer to make a power saving circuit

    Hi,


    You don't need a DFF. The MCU will keep it's I/O as you program it ... even in sleep mode.

    Klaus
  24. Closed: Re: 14 bit adc output to 5 bit data conversion in VHDL

    Hi,

    Maybe I misunderstand..

    But if you want to generate 5 (linear. Not logarithmic like u-law, A-law) bits from a 14 bit ADC ... then just use the 5 upper bits and ignore the 9 lower...
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    Closed: Re: Measure inl of an ADC in cadence

    Hi,

    This topic is not new, thus do an internet search "INL measurement ADC" to find documents.

    I see documents from adc manufacturers, but I assume cadence gives related informations, too.
    ...
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