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Type: Posts; User: KlausST

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  1. Replies
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    [SOLVED]Closed: Re: Back EMF Diode Configuration

    Hi,

    I ssume the Ls are coupled.

    If so, then neither A nor B will work.

    There are discussions about it in the forum.

    Klaus
  2. Replies
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    Closed: Re: "IR based" relay driving problem

    Hi,





    Klaus
  3. Replies
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    Closed: Re: Driving Induction motor using TRIAC

    Hi,



    Quarter watt: I didn't read them....but I expect the MOC datasheet or MOC application notes tell you.
    Take care about the voltage rating, too.

    MOV: this problem isn't new, thus you...
  4. Replies
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    Closed: Re: "IR based" relay driving problem

    Hi,

    You should know: electronics has to do with voltage and currents.
    To be able to calculate a circuit, we additionally need to have the datasheets of the used parts.
    Thus we need to know the...
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    Closed: Re: Driving Induction motor using TRIAC

    Hi,


    No.

    "X2" is the safety compliance of the 47n capacitor.

    Klaus
  6. Replies
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    Closed: Re: OP amp output oscillating

    Hi,

    I assume you did not use all 4 opamps ... and you left some (unused) inputs floating.
    A no-go.

    Besides this I don't think a breadboard is useful for this application.

    I see no GND...
  7. Replies
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    Closed: Re: OP amp output oscillating

    Hi,

    * Do you have a solid GND plane for reliable GND?
    * are there ceramics capacitors at each ICīs supply pin with low impedance connection to GND to stabilize VCC?
    * is it a breadboard circuit?...
  8. Replies
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    Closed: Re: Need help in LED controlling

    Hi,

    what about a truth table?

    What switches, what LEDs, what supply, voltages and currents....

    Klaus
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    Closed: Re: switch not working with controller

    Hi,

    The highlighted green pieces of signals show that you donīt use EAGLE correctly.

    --> use the EAGLE tutorial how to connect, route and name signals. Itīs as easy as can be.

    Klaus
  10. Closed: Re: Reducing quantization noise in ADC with oversampling

    Hi,

    this only works when the converted samples have different values.
    If the signal is stable and free of noise and you get always the same sample value ... you donīt get better overall noise. ...
  11. Closed: Re: Why do semiconductor companies not provide their datasheets publicly?

    Hi,


    I never had a problem with a company and the NDA even for very low volume (1...50 pcs) industrial development.

    Klaus
  12. [SOLVED]Closed: Re: connecting Single output to multiple output

    Hi,

    additionally you need to consider wiring capacitance.
    Wire length plays a role when considering reflections.

    It makes a difference if the 20 DFF ICs are all on one PCB with short wiring or...
  13. Closed: Re: How create negative voltage -700mV - -1000mV 30mA?

    Hi,

    So output voltage depends on a lot of parameters...

    The whole thing is a voltage inverter with series resistance.


    Klaus
  14. Closed: Re: LED light power supply fix recommendations

    Hi,

    Sounds good.
    Then every 350mA CC LED supply should work.

    Klaus
  15. Closed: Re: Common mode noise and earth connections in offline SMPS

    Hi,


    Is it? A common mode choke should work. Or a ferrite ring around the supply wires...


    You talk about common mode noise current.

    Indeed it can be minimzed by disconnecting EARTH.
  16. Closed: Re: LED light power supply fix recommendations

    Hi,

    Just find out V and I of your LED.

    A measurement at full brightness (if adjustable) will do also.

    Klaus
  17. Closed: Re: LED light power supply fix recommendations

    Hi,

    The power supply seems to have two operating modes:
    * current limiting to 350mA, for LEDs with Vf <= 10V
    * or voltage limiting to 12V for LEDs with If <= 300mA.

    Now the qustion is:
    What...
  18. Closed: Re: Voltage dimensioning MOSFET in Synchronous Buck ?

    Hi,

    The better the layout, the less is stray inductance --> the less overshot. Thus you need less headroom.
    The slower the voltage rise and fall rate --> the less overshot. Thus you need less...
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    Closed: Re: PNP transistor not working

    Hi,

    I agree.

    A bit more detailed description is needed.
    I see you are no friend of GND (symbols). Please use them. It helps to avoid misunderstandings.

    Example: You talk about "negative"...
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    Closed: Re: computing rated current for inductors

    Hi,

    What is going on here.
    I could not open the pdf of post #1 (I always recommend to use the PDFs directly from the manufacturer, they are most up to date)





    The datasheet from...
  21. Replies
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    Closed: Re: Voltage control using PWM

    Hi,

    I'm not familiar with PIC,

    But "CCP1" sounds like a capture input.

    When using capture feature you need to setup the capture periferal. I don't see this in your code.
    Please explain how...
  22. Closed: Re: How create negative voltage -700mV - -1000mV 30mA?

    Hi,


    This sounds as if one could control the output voltage by modifying the capacitor value.
    Where in the ICL7660 did you read this statement?

    Klaus
  23. Replies
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    [SOLVED]Closed: Re: PIC12F683 pin high problem

    Hi,


    Out of curiosity I had a look into the datasheet.
    25mA is not an "operational" current. It is the absolute maximum, the edge to get killed.

    Klaus
  24. Replies
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    Closed: Re: Short circuit protection in PCB design

    Hi,


    How can we know? Did you give your requirements/specifications? We donīt know nothing about your application.

    Klaus
  25. Closed: Re: Current sampling of dc motor for closed loop control.

    Hi,

    I_peak is already explained
    I_avg tells you about the motor torque
    I_RMS is good if you want to calculate winding loss. (heating)

    Klaus
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