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  1. Replies
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    Closed: Re: How would i decrease the clock frequency

    The Si5351 from Silicon Labs is a Low-cost PLL IC just incase you are designing on the board level.
  2. Replies
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    Closed: Re: How would i decrease the clock frequency

    Hi Klaus,

    I don't seem to understand how my solution would give 2% duty cycle. Can you explain please?

    - - - Updated - - -

    (4999 - 4095)/5000 = 0.18 = 18% duty cycle. That is 0.18*1/10000Hz...
  3. Replies
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    Closed: Re: How would i decrease the clock frequency

    Hi,

    You need an n-bit counter (i.e. 2^n - 1 is greater than or equal to the number of counts that you want minus 1). In your case, since 2^12 - 1 = 4095 (which is not enough to count up to 5000 -...
  4. Closed: Re: Power consumption calculations including efficiency

    No, Pin_tot_converters = Pout_tot_converters/efficiency = 62W/0.9 = 68.89W

    No, you've calculated the total input power to the three converters as Pin_tot_converters already.



    No way. This...
  5. Closed: Re: Find dc voltage gain and phase margin from graph

    It seems like your DC gain is about 91dB but we cannot be so sure because your plot is shown from 100kHz. Plot again from 1Hz or 10Hz or even 100Hz.

    We can't tell what your phase margin is because...
  6. Replies
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    Closed: Re: Chossing MOsfet for boost converter

    There is no boost converter design guide in the TL494 datasheet.
  7. Closed: Re: Using 0-10V analog sensor output with rasbery pi

    Hi,

    I think the information given about the sensor is not very clear. We have 0-10V and 4-20mA. Is there any relationship between the two? That is to say, does the voltage change with change in...
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    Closed: Re: Digital Transition Capture

    You have mentioned too many frequencies: 10MHz, 30MHz, and the "input" waveform of your last post shows a frequency that is about double that of the 30-MHz clock.

    Anyways, the idea is that the...
  9. Replies
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    Closed: Re: Chossing MOsfet for boost converter

    Hi,

    I'm afraid that this plan of doubling your load current might land you in trouble. First of all, there is a point of concern. How do you intend to double the load current?

    MOSFETs are not...
  10. Replies
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    Closed: Re: Digital Transition Capture

    10MHz is too high for a 555. 3-MHz is specified for the cmos version.

    BTW, when you say 10MHz, is it the clock frequency or the data. You didn't say which and you didn't mention the other.
  11. Replies
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    474

    Closed: Re: Digital Transition Capture

    What are your frequencies? List them so we know. Even the 555 has limitation in frequency.

    Is that the original clock or a derived clock?
  12. Replies
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    Closed: Re: Active-HDL VHDL simulation problem

    Hi,

    I'd suggest that you take add1 above stimulus in your testbench and then try again.
  13. Replies
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    474

    Closed: Re: Digital Transition Capture

    Hi,

    A simple FSM will do it.

    You need two pipelined registers, reg1 and reg2. Keep the current data in reg1. On the next clock edge, move the content of reg1 to reg2. Always compare each bit in...
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    [SOLVED]Closed: Re: for generate with step other than one

    The nested for-generate statement



    The outer generate statement generates the rows. The inner generate statement generates the units in each of the rows as columns.



    ...
    architecture...
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    Closed: Re: iPhone charger vs Samsung charger.

    I probably have been buying counterfeits then.

    I may have to post pictures of the ones I buy for discussion on here.

    - - - Updated - - -

    We can discuss it to determine what the causes of the...
  16. Replies
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    Closed: Re: DCDC Step down possible circuit?

    Please reconcile the two schematics that you have posted in post #1 and post #6.
  17. Closed: Re: Voltage inverter feedback for microcontroller (TL431 and 4N25)

    Hi,

    You need to show the part of the loop after the optocoupler. Since the loop is not complete, it's impossible to say what's making it not work.

    The only components to the right of the opto...
  18. Replies
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    Closed: iPhone charger vs Samsung charger.

    Hi all,

    My friends using iPhone enjoy long-lasting charger experience.

    I have a Samsung Edge. I buy a fast charger every now and then as they get damaged from the slightest impact from the...
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    Closed: Re: How to generate H(-s) in MATLAB

    Hi,

    Provide a little more detail of what you want to do, especially on H(-s).
  20. Closed: Re: Voltage inverter feedback for microcontroller (TL431 and 4N25)

    Hi,

    How did you come up with the value for resistor R56?

    You should have 1mA flowing through the optocoupler diode biasing resistor and then a reasonable amount (depending on the optocoupler...
  21. Replies
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    425

    Closed: Re: DCDC Step down possible circuit?

    Hi,

    Why the TVS diode? You need a rectifier switch connected to GND at the node upstream of the inductor, downstream of the FET.
  22. Closed: Re: Connecting a SPDT switch to I/O pin of a CPLD

    Normally for SPST switches, we use a current limiting resistor in the arm without the switch to prevent shorting the supply voltage to GND when the switch is CLOSED but we do not current-limit the...
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    Closed: Re: 24V to 5V Buck converter

    Sorry, I meant to say forward voltage of the LED here.



    FvM has a point here. This will correct the duty cycle somewhat. The equivalent load resistance should be 5V/20mA = 250 ohm.
    Lcrit then...
  24. Closed: Re: Connecting a SPDT switch to I/O pin of a CPLD

    See this excerpt from the datasheet.

    153480

    The input has a high impedance like you have been told. You do not need a current-limiting resistor for a pin used as an input.
  25. Replies
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    [51]Closed: Re: problem with submersible water pump

    You have a lot of from the posts above. try to try to curb the transients that come with switching an inductive load like has been told.



    It is not very clear when you say that the sensor is...
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