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  1. Replies
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    Closed: Re: HP 54520A Blown Fuse Problem

    The crowbar was also my thought in post #23, but since it is on the secondary side and the fuse blows even with the main switch transistor Q3 removed, it must be something else.
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    Closed: Re: HP 54520A Blown Fuse Problem

    It can be an isolation problem in the common mode choke L1. Remove it and bypass with two wires. If the scope works, get a replacement choke, or rewind it yourself on the existing core..
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    Closed: Re: Elementary battery question

    Temperature is not used to detect full charge in Li-Ion batteries- That can be done in NiCd and NiMh.
    For Li-Ion, the temperature sensor is only for protection, to switch off the charger if...
  4. Closed: Re: Finding certain string in file using bash shell scriot

    This is a job for "sed" or "awk", but I think you should tell us the expected output from your example.
    Is the "*|NET" always on the same line as the value?
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    Closed: Re: using a power inverter in a car

    If the inverter still works when it beeps and warns, the simplest solution is to remove the warning buzzer.
    If the inverter is destroyed because of 14-15V supply, it is junk anyway.
  6. Closed: Re: FSK 1200baud discrete "modulators". What do you think?

    I don't think the phase must be synchronized with the data, but there should be no discontinuities, so switching between two different oscillators is a bad idea.
  7. [SOLVED]Closed: Re: Reading from a TXT file to a 2d array in vhdl

    Maybe not a good solution, but it should be possible to initialize the constant from a function that makes a separate "pre-read" of the file to check how much data there is.
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    Closed: Re: default statement in case

    This is only true if you do the state encoding explicitly (and not as one-hot).
    If you let the synthesis tool select the FSM coding, I think it is impossible to write generic source code to...
  9. Closed: Re: Understanding Linear implementation of a round-robin arbiter

    It seems that the top block keeps track of the last grant, and activates the 'p' signal for the next block to give it the highest priority.
    However, any block can make a request.
    The priority logic...
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    Closed: Re: Help me to detect an IC in a circuit

    It is a SN65LBC179 "LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS"

    https://www.ti.com/lit/ds/symlink/sn65lbc179.pdf
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    Closed: Re: AN1292 Application Note Microchip

    Edit:

    qSin(2) = (2^15-1) * sin((2 / 128) * 2 * pi) = 3211.727637 ~ 3212
  12. Closed: Re: Help to make use of an .h file in my vhdl code

    I haven't looked at your files, but VHDL doesn't support include files.
    You should put common stuff in a package, which you then can use in any module.
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    Closed: Re: Extracting energy from gyroscope precession

    Precision99 is correct.
    For an outside (stationary) observer, the angular momentum is conservered, not the rotational energy.
    By pulling the arms inward, the skater does "work", which ends up as an...
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    Closed: Re: VHDL integer to integer multiplication

    An integer has no bits, it is only a value. You can use "range" to restrict the possible values.
    I think it is required that the internal representation in the simulator has at least 32 bits.
    ...
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    Closed: Re: VHDL integer to integer multiplication

    integer is not a datatype from numeric_std. It is a built-in datatype.
    No library/package is needed for integer*integer.
    The result is an integer.
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    Closed: Re: Extracting energy from gyroscope precession

    I think I now agree with you.

    One thought experiment: the spinning bicycle wheel suspended on only one end of the axle (as seen on several videos on Youtube). We agree that the precession...
  17. [SOLVED]Closed: Re: I have a problem related to Embedded C .

    I think the real problem is that the prototype for the function delay() can't be between main() and the opening curly brace.
    It must be before main() or after the curly brace.

    The space before...
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    Closed: Re: Extracting energy from gyroscope precession

    Ok, now we know in detail why we don't agree.

    Your argumentation is in the reverse order:
    Since the energy can't go anywhere, no work is done, and therefore the force must be zero.

    My...
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    Closed: Re: Extracting energy from gyroscope precession

    You mean that the spinning axis will change without the hands applying any force/torque in the direction of the change? That 100% of the force/torque from the hands will be used to resist the...
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    Closed: Re: Extracting energy from gyroscope precession

    No. If something moves in the direction you apply force, work is done. If you resist the tilting of the spinning axis or in some other way prevent the tilting, the only movement will be the "axle...
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    Closed: Re: Extracting energy from gyroscope precession

    An external force is needed for the precessing force to exist. If you only support one end of a gyroscope, the external force is the gravity. In that case, any energy extracted from the precessing...
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    Closed: Re: Extracting energy from gyroscope precession

    There are two forces involved. One from your arms and one as a reaction from the gyro. The simplest case is when we keep the gyro (bicycle wheel) spinning axis horizontal during the movement. The...
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    Closed: Re: resistor mismatch and the resolution

    Weight of highest bit = 512
    Weight of lowest bit = 1

    Error in highest bit that corresponds to the weight of the lowest bit = 1/512 = 1/(2^9)
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    Closed: Re: Extracting energy from gyroscope precession

    The "reaction" force is perpendicular to the movement, so no work is done. However, your arms apply a horisontal force, and there is a horisontal movement (the one that creates the reaction force),...
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    Closed: Re: Extracting energy from gyroscope precession

    A swing can be started without friction.
    We can move some part of the mass off-center (some other part will go off-center in the other direction).
    If we then move this mass up/down with correct...
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