Search:

Type: Posts; User: KlausST

Page 1 of 20 1 2 3 4

Search: Search took 0.12 seconds; generated 47 minute(s) ago.

  1. Closed: Re: how to measure the output of a crystal oscillator?

    Hi,

    difficult to answer.. I just don't have the manual of your multimeter by the hand.

    Klaus
  2. Replies
    4
    Views
    249

    Closed: Re: Calculating BLDC controller efficiency

    Hi,

    I just did an internet search for "motor test equippment" ... a lot of good looking results.
    Did't you try this in your own?

    And for DC.. maybe just voltage and current measurement is...
  3. Replies
    12
    Views
    355

    Closed: Re: Problem with using ic uA733

    Hi,

    May I ask why you use a differential amlifier when you just use one output?
    To measure gain you need to involve both outputs: Vout = VOut+ - VOut-

    Just to talk about the same datasheet:...
  4. Replies
    4
    Views
    120

    Closed: Re: Voltage sense using summing amplifier

    Hi,

    Now two new resistors.
    They make things complicated, because they involve new source impedance, that needs to be added to the input resistance R1.
    Additionally the suming_point_voltage...
  5. Closed: Re: PIC serial port receive Problem, please help

    Hi,

    I don't understand:
    * when you say you use ft232, then your PIC needs to have an USB_host to operate it.
    If it does work with FT232, then why not use it this way?


    Connecting what to...
  6. Replies
    4
    Views
    120

    Closed: Re: Voltage sense using summing amplifier

    Hi,

    Please use the same voltage naming as in the schematic. (Why do you make it more complicated than necessary?)
    Please use the same resistor naming as in the schematic. (There is no R4 at all)...
  7. Replies
    4
    Views
    249

    Closed: Re: Calculating BLDC controller efficiency

    Hi,

    What efficiency?

    Motor_mechanical_power_out / electrical_DC_power_in ?

    Klaus
  8. Closed: Re: PLL and LCD: LCD shows garbage while PLL is used

    Hi,


    Here I am.

    Yes, I agree with Brian: timing problem.
    But without useful informations..all we can do is guessing.
    No information about
    * code
    * display type
  9. Replies
    6
    Views
    277

    Closed: Re: Regulating without load

    Hi,

    Don't use a switch mode regulator without output capacitor.
    Depending what type it is it could immediately kill itself.

    Read the datasheet, it shows the minimum circuit required to operate...
  10. Replies
    11
    Views
    424

    Closed: Re: setting bits in byte

    Hi

    In a byte there are 8 bits.
    Usually they are called bit 0 up to bit 7 in descending order (7654 3210)
    If you use this nomenclature (bit0 ... bit7) then
    * if you want to set bit 5 you have...
  11. Replies
    6
    Views
    277

    Closed: Re: Regulating without load

    Hi,

    It depends what you call "regulate".
    Without load, there will be output voltage..so it does regulate somehow.

    But there will be no continous switching. Rather burst mode or with greatly...
  12. Replies
    5
    Views
    184

    Closed: Re: P-channel Mosfet inverting control

    Hi,

    The chosen high side switch has the desired "inverting" function.
    But it has an internal pull up current source. The voltage may go up to the input voltage.
    A simple TTL signal may be...
  13. Replies
    5
    Views
    266

    [PIC]Closed: Re: Code for dspic33fj32mc204

    Hi,

    A forum is not meant that others do your job or post code for you.

    Btw: an internet search gives a lot of application notes, tutorials, documents that show how to do it.
    Even the most...
  14. Closed: Re: Circuit to capture the motor inrush current

    Hi,


    Actually you did not show a complete circuit to measure motor current.
    You showed a diagram with a couple if black boxes ... with unknown circuit inside.

    Klaus
  15. Replies
    5
    Views
    184

    Closed: Re: P-channel Mosfet inverting control

    Hi,

    It may work,

    But I'd rather use a single part called " high side power switch, active low".
    Besides the desired function in a single tiny device, it additionally includes overvoltage...
  16. Closed: Re: Calculating capacitor ripple current in output filter of DCDC module?

    Hi,


    Although I think that tan d will be higher at 20kHz ... the ESR may be lower...

    Usually if the capacitor is not specified for 20kHz or higher it is not suitable for this frequency.
    ...
  17. Closed: Re: Calculating capacitor ripple current in output filter of DCDC module?

    Hi,

    "tan d of 0.08" is only half of the information you need. You additionally need the tan d test frequency to be able to calculate ESR.
    You talk about microohms... but if the value is given for...
  18. Replies
    13
    Views
    652

    Re: learning to detect radio signal.

    Hi,


    Yes, there are people that can build their own spectrum analyzer.

    But I doubt it makes sense for a single piece. It needs a lot of HF experience, high speed ADC experience, PCB layout...
  19. Closed: Re: Calculating capacitor ripple current in output filter of DCDC module?

    Hi,


    I agree.

    Klaus
  20. Replies
    14
    Views
    615

    Closed: Re: would an engineer use this equation?

    Hi,


    It's not only formulas, there are design rules, you need to make decisions...

    There are a lot of online courses, design notes, tutorials on how to design flyback converters.
    Look for...
  21. Replies
    35
    Views
    879

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

    Hi,

    One last comment.

    This is not true.
    --> In every post I told the key problem is that you don't keep on specifications and design rules.
    I know one does not want to hear this. Nobody...
  22. Replies
    35
    Views
    879

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

    Hi,


    Ask yourself:
    * It works (by accident), just because you observed it's final function for some hours...
    * or it works reliably, because you kept on specification and design rules

    I...
  23. Replies
    6
    Views
    334

    Closed: Re: Repeat Cycle using timer application

    Hi,


    If this is true, how can some of my applictions's display work?

    And read carefully:

    If you use multiplexing techniques (or other requirement) that needs exact timing...you should...
  24. Replies
    1
    Views
    201

    [SOLVED]Closed: Re: Online multisim simulation DC analysis

    Hi,

    V_CE of 4.6V makes no sense.

    Either it is
    * V_C (measured with respect to GND) instead of V_CE (with respect to emitter voltage)
    * or you did not simulate steady state (capacitors not...
  25. Replies
    35
    Views
    879

    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...
Results 1 to 25 of 496
Page 1 of 20 1 2 3 4