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Type: Posts; User: KlausST

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  1. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Hi,


    From post#55:

    But you inverted both!

    Regarding the resistor to measure the current.
    The resistor value should be low, low enough not to influence the function of the circuit.
    A usual...
  2. Closed: Re: Enable circuit for backup battery boost converter

    Hi,

    Add two resistors an NPN BJT.
    Two resistors as voltage divider from 8V
    Center of divider to bjt_base
    Bjt emitter to GND
    Bjt collector to Boost_EN

    Klaus
  3. Closed: Re: how to select capacitor for ruhmkorff coil?

    Hi,


    The voltage of the capacitor is also limited by the available energy.
    E = 0.5 × V × V × C --> V = sqrt( 2 E / C)

    When the energy comes from a coil, then E = 0.5 × I × I × L

    Klaus
  4. Closed: Re: PIC16F877 interface with ds1307 ...RTC running 10 sec slow

    Hi,

    Honestly, I see absolutely no use in simulating the accuracy of an RTC.
    Simply trust the datasheet. The datsheet specifications should be more reliable than any simulation.

    And even if the...
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    Closed: Re: Voltage drop using 1 MOS

    Hi,

    You mean a MOSFET?
    N-channel or P-channel?

    Draw a schematic (hand drawn) of your idea.
    What does "it doesn't work as expected" exactly mean?
    Show us the test setup.
    And what is your...
  6. Closed: Re: How to convert CMRR in DB to Numerical Value

    Hi,

    What about doing an internet search on your own: "online dB calculator"...

    Klaus
  7. Replies
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    Closed: Re: Circuit with an integrated FLIP FLOP

    Hi,

    "my first approach" of post#3 should give all you need to know.

    If not, then do an internet search with the given informations.

    Klaus
  8. Replies
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    Closed: Re: BMS Circuit design using a BMS IC.

    Hi,

    All we could do is an internet research...the only useful information we have is "10S" or "20S".

    So it's a rather unelaborated question.

    So my expectation is that people spend their...
  9. Replies
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    Closed: Re: ST7036i and mikroc STUCK

    Hi,

    If I had to debug it I'd use a scope to see the signals.
    With it you exactly see the signals on the bus...you are able to detect software problems as well as hardware problems.

    Hardware...
  10. Replies
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    396

    [PIC]Closed: Re: interfacing 74HC4051 with pic18f4550

    Hi,


    There is no best solution.

    * no free pins at all
    * internal pullup / pulldiwn
    * programmable pullup / pulldown
    * keeper
    * external pullup / pulldown
  11. Closed: Re: computer parallel port external relay control

    Hi,

    The only question of post#1 is


    Klaus
  12. Replies
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    [AVR]Closed: Re: Temprature sensors. LM35 vs MCP9700

    Hi,

    my recommendation: Read the datasheets. Both datasheets specify accuracy.
    At least this is the way I`d do it.

    Klaus
  13. Replies
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    Closed: Re: Circuit with an integrated FLIP FLOP

    Hi,

    can you please draw a truth table,

    your 1) violates your 2)
    --> I assume: when pinA = 1 and pinB = 1: do nothing = hold mode = no change

    your 2) is O.K.

    your 3) reduces to: when...
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    Closed: Re: Bootstrapping with Opto Driver

    Hi,


    This all makes no sense to me.

    --> Show a sketch/circuit about your idea.

    Klaus
  15. Replies
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    Closed: Re: Bootstrapping with Opto Driver

    Hi,

    This circuit makes more sense:

    It differs to the first one:
    * Now there is no capacitor beween A nd C of the LED. It is between pin2 and GND. Mind the junction dot.
    * It seems to be a low...
  16. Replies
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    Closed: Re: Bootstrapping with Opto Driver

    Hi,

    this is an inclomplete circuit. I don´t think it is correct. It does not make sens to discuss abut an incomplete circuit.

    Where is it from? --> give a link ..
    and give full description.
    ...
  17. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Hi,



    As already mentioned: You don't measure the gate current.
    --> If you want to know the gate current, then measure the gate current.

    And we don't talk about steady current, we talk...
  18. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Hi,

    well done :-)


    1) typical with SCR and triacs. The gate needs some current to trigger, the diac needs some voltage to trigger, the capacitor needs some time to charge....
    2) It´s no...
  19. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Hi,



    Yes, for sure. It does what it should do. It measures the voltage at the given node with respect to GND.
    If you want to measure the voltage across the load, then you have to measure one...
  20. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Hi,


    Didn't we recommend several times to put the load at tha anode side?

    May I ask where you see the benefit when you repeatedly connect it to the cathode side?

    Again: it just causes...
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    Closed: Re: UC3845 ETD29 transformer PWM signal

    Hi,


    You know: No signal goes one way, it always needs a return path. And if the return path is long and high impedance the whole signal will be slow and ringing.
    --> Don´t see only the signal...
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    Closed: Re: UC3845 ETD29 transformer PWM signal

    Hi,

    PCB layout:

    See the picture. I showed the current flow loop for the gate current.
    A good layout: should have as low as possible enclosed loop area. (low EMI, EMC) And it should have all...
  23. Closed: Re: Tool for transforming python code to FPGA for Machine Learning

    Hi,

    Maybe there is...but it's against the idea software vs hardware,

    It's an often made mistake to look/write HDL like software.
    Software is processed sequentially, one instruction after the...
  24. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Hi,

    GROUND is just a name. A name for the node which the designer (you) decided to be the voltage reference.
    Theoretically any node in any circuit may be called GROUND. It does no necessarily...
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    Closed: Re: UC3845 ETD29 transformer PWM signal

    Hi,

    You know you gave just half of the requested informations...
    You will have your reasons....
    Thus I can't verify the some items.

    Anyway. Sadly you wasted almost one layer. The red layer is...
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