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  1. Replies
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    Closed: Re: Series rlc and parallel rlc circuits

    The electrons move back and forth between the capacitor and the inductor.
    Compare this movement with a mechanical pendulum. It can move much more than the movement you used to push it.
    It is the...
  2. Closed: Re: Best Solution to use DOT POINT by REVERSING 3rd. one Digit of 4-digit seven segme

    Yes, you can rearrange the connections to the reversed M-ten so it behaves like the other digits.
  3. Closed: Re: SOT23-5 Component with Code starting with UU - Trying to identify the component

    It is probably a Microchip MCP6L91 opamp.

    http://ww1.microchip.com/downloads/en/DeviceDoc/22141b.pdf

    Edit:
    I10 is connected to pin 1, which is the output of the opamp (the amplified input...
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    Closed: Re: Active-HDL VHDL simulation problem

    The hierachy looks wrong. The and gate "add1" should be a subcircuit to "tb_en". Only the stimuli process is listed, so the and gate has not been connected.
    Run it again in modelsim and look at the...
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    [SOLVED]Closed: Re: Multiple relay with controllers

    74HC4094 is an alternative to the 74HC595.
    The differences are discussed here:
    https://electronics.stackexchange.com/questions/6676/which-sipo-chip-is-better-74hc4094-or-74hc595-or-something-else
    ...
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    Closed: Re: Active-HDL VHDL simulation problem

    Don't use signal type "bit". With "bit" you will lose a lot of the advantages with simulation. In this case you can't see if out_c is driven by something or not.
    One explanation for your problem is...
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    Closed: Re: Output impedance of RF filter

    A complex output impedance will always be frequency dependent?
  8. Closed: Re: Bulk capacitor series with 1 ohm resistor

    Maybe to reduce the current surge when something is connected to the right connector (which has the "VMM" net).
  9. Closed: Re: Input impedance of transmission lines connected in cascade

    A properly terminated transmission line has it's specific input impedance. It doesn't matter if it is terminated by a termination resistor or another transmission line with the same impedance.
    The...
  10. Closed: Re: NPN is bahaving as oscillator when used with DALI comms bus

    Please measure the rectified DALI bus with the scope, and also the base voltage and the voltage that the pull-up resistor R24 is connected to.
    The 120 kHz should be visible on one of these signals....
  11. Closed: Re: Selection of ICs, Transistors, Power Supply for Big 7-Seg (say 6 inch) for MCU

    No, the voltage drop across the resistor should only be about 3V (15V - 12V). So 100 Ohms for 30 mA or 50 Ohms for 60 mA.
    If you start vith a supply voltage and segment resistors that only give 20...
  12. Closed: Re: Selection of ICs, Transistors, Power Supply for Big 7-Seg (say 6 inch) for MCU

    It will work just fine.
    For a 6 digit clock, the average current in the LED's will only be 30 mA / 6 = 5 mA, but that is more than enough for modern LEDs.
    According to the datasheet, the decimal...
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    Closed: Re: if/else vs. if/if in combo logic

    If "a" and "b" are different values, the truth tables for the "out" bits will be identical, so the synthesized result should be identical for a good synthesizer.

    For an if/else chain, only one...
  14. Closed: Re: Selection of ICs, Transistors, Power Supply for Big 7-Seg (say 6 inch) for MCU

    Some old TI LED calculators multiplexed the other way around, they enabled one segment at a time for all digits.
    The advantage is that the peak current is independent of the number of digits. The...
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    Closed: Re: Degeneration of Array in MATLAB

    You mean rounding?


    octave> A=[1.0, 1.001, 2, 3, 4]
    A =

    1.0000 1.0010 2.0000 3.0000 4.0000

    octave> unique(round(A))
    ans =
  16. Replies
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    Closed: Re: Truncation of elements in MATLAB Array

    octave> A=[1000, 200, 3, 10]
    A =

    1000 200 3 10

    octave> A=A.*(abs(A)>=10)
    A =

    1000 200 0 10
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    Closed: Re: Ethernet speed - some basic questions

    All types of gigabit ethernet have a payload ("netto data rate") of 125 Mbyte/s. Only some types use 8B/10B encoding and for those types the line rate must be 1.25 Gbit/s.
    The common 1000BASE-T does...
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    Closed: Re: Ethernet speed - some basic questions

    The headers always exist in every packet, so for udp is 42 bytes "lost" in each packet of 64-1500 bytes.
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    Closed: Re: Ethernet speed - some basic questions

    Normal ethernet packets are 64-1500 bytes. Jumbo frames/packets are up to about 8000 bytes.
    42 bytes are lost in each packet for udp, but there are 3 levels:
    ethernet header: 14 bytes
    ipv4 header:...
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    Closed: Re: Ethernet speed - some basic questions

    Yes, 125 MByte/s is the raw speed. For ipv4 udp, 42 bytes are lost per packet for 3 different levels of headers. For tcp it's similar.
    To maximize throughput, you want 8K jumbo frames instead of the...
  21. Closed: Re: UART-->RS485 (transmission is finished and it may respond)

    I have two different types of standalone RS232-RS485 converters here that require no control signal, the driver is enabled/disabled automatically. There is no baudrate setting, and no specified...
  22. Closed: Re: UART-->RS485 (transmission is finished and it may respond)

    Standalone RS232 to RS485 converters can't know where the end of the stop bit is, because the baudrate is unknown.
    One solution I have seen is to only activate the driver for level '0' and for '0'...
  23. Closed: Re: Nice videos. PIC, c #, css c embedded systems and more

    If you speak in english you can have more subscribers (if you are good, which I can't tell since I didn't understand anything).
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    Closed: Re: Arm RTOS C++ newbie advice

    No, it means that you have written programs for an ARM processor running some real-time version of linux. It is common to do such work sitting at a Windows PC.

    I think it is a bad idea to have...
  25. Closed: Re: What does this DCDC inductor "40%" mean?

    No, they mean that the peak current should not be more than 20% higher than the average current.
    The saturation current is not involved in the statement, it should only be higher than the peak...
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