std_match
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15th October 2019, 14:07std_match replied to a thread How two nodes are communicating in CAN bus protocol? in MicrocontrollersUse a CAN bit timing calculator. Online: https://www.kvaser.com/support/calculators/bit-timing-calculator/ Windows program:...7 replies | 417 view(s) -
15th October 2019, 11:52std_match replied to a thread [SOLVED] USB to RS232 exactly similar to COM1 in Service Manuals, Requests, Repair TipsYou must have connected the MAX3232 wrong. The RS232 outputs from MAX3232 are on pins 7 & 14, and one of them should be connected to pin 3 (TXD) of a...9 replies | 508 view(s)
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15th October 2019, 10:32std_match replied to a thread [SOLVED] USB to RS232 exactly similar to COM1 in Service Manuals, Requests, Repair TipsThe +/- 3V is correct for the RS232 receiver, so for short cabling it should work if the transmitter gives at least +/- 3V. I don't think the...9 replies | 508 view(s)
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15th October 2019, 10:19std_match replied to a thread How two nodes are communicating in CAN bus protocol? in MicrocontrollersThat was the intention when the CAN bus was designed, but that functionality is normally handled by software, so you can design your system in other...7 replies | 417 view(s)
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13th October 2019, 00:29std_match replied to a thread HP 54520A Blown Fuse Problem in Service Manuals, Requests, Repair TipsThe 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...37 replies | 2076 view(s)
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12th October 2019, 23:36std_match replied to a thread HP 54520A Blown Fuse Problem in Service Manuals, Requests, Repair TipsIt 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...37 replies | 2076 view(s)
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12th October 2019, 21:03Temperature 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...4 replies | 254 view(s)
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9th October 2019, 18:20std_match replied to a thread Finding certain string in file using bash shell scriot in ASIC Design Methodologies and Tools (Digital)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...4 replies | 435 view(s)
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9th October 2019, 15:49If 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...6 replies | 308 view(s)
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9th October 2019, 15:03std_match replied to a thread FSK 1200baud discrete "modulators". What do you think? in Digital Signal ProcessingI don't think the phase must be synchronized with the data, but there should be no discontinuities, so switching between two different oscillators is...5 replies | 1067 view(s)
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9th October 2019, 10:01std_match replied to a thread [SOLVED] Reading from a TXT file to a 2d array in vhdl in PLD, SPLD, GAL, CPLD, FPGA DesignMaybe 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...20 replies | 905 view(s)
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7th October 2019, 10:35std_match replied to a thread default statement in case in ASIC Design Methodologies and Tools (Digital)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...6 replies | 518 view(s)
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1st October 2019, 16:38std_match replied to a thread Understanding Linear implementation of a round-robin arbiter in PLD, SPLD, GAL, CPLD, FPGA DesignIt 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,...3 replies | 330 view(s)
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30th September 2019, 14:24std_match replied to a thread Help me to detect an IC in a circuit in Elementary Electronic QuestionsIt is a SN65LBC179 "LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS" https://www.ti.com/lit/ds/symlink/sn65lbc179.pdf1 replies | 145 view(s)
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30th September 2019, 13:59Edit: qSin(2) = (2^15-1) * sin((2 / 128) * 2 * pi) = 3211.727637 ~ 321211 replies | 602 view(s)
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26th September 2019, 17:17std_match replied to a thread Help to make use of an .h file in my vhdl code in PLD, SPLD, GAL, CPLD, FPGA DesignI 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...13 replies | 541 view(s)
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26th September 2019, 08:33std_match replied to a thread Extracting energy from gyroscope precession in Mathematics and PhysicsPrecision99 is correct. For an outside (stationary) observer, the angular momentum is conservered, not the rotational energy. By pulling the arms...84 replies | 3513 view(s)
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25th September 2019, 13:22std_match replied to a thread VHDL integer to integer multiplication in PLD, SPLD, GAL, CPLD, FPGA DesignAn 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...3 replies | 215 view(s)
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25th September 2019, 12:43shaiko replied to a thread VHDL integer to integer multiplication in PLD, SPLD, GAL, CPLD, FPGA DesignThanks, Is it possible to force an integer to be less then 32 bits long ?3 replies | 215 view(s)
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25th September 2019, 12:14std_match replied to a thread VHDL integer to integer multiplication in PLD, SPLD, GAL, CPLD, FPGA Designinteger 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.3 replies | 215 view(s)
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25th September 2019, 12:08std_match replied to a thread Extracting energy from gyroscope precession in Mathematics and PhysicsI 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...84 replies | 3513 view(s)
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25th September 2019, 11:48Hello, This is the definition of the "numeric_std" multiplication function ( '*' ) -- Id: A.15 function "*" (L, R: UNSIGNED) return...3 replies | 215 view(s)
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24th September 2019, 01:12I 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...4 replies | 315 view(s)
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22nd September 2019, 18:26std_match replied to a thread Extracting energy from gyroscope precession in Mathematics and PhysicsOk, 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,...84 replies | 3513 view(s)
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22nd September 2019, 11:29std_match replied to a thread Extracting energy from gyroscope precession in Mathematics and PhysicsYou 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...84 replies | 3513 view(s)
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22nd September 2019, 00:00std_match replied to a thread Extracting energy from gyroscope precession in Mathematics and PhysicsNo. 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...84 replies | 3513 view(s)
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21st September 2019, 20:19std_match replied to a thread Extracting energy from gyroscope precession in Mathematics and PhysicsAn 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...84 replies | 3513 view(s)
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21st September 2019, 16:53std_match replied to a thread Extracting energy from gyroscope precession in Mathematics and PhysicsThere 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)...84 replies | 3513 view(s)
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19th September 2019, 23:24std_match replied to a thread resistor mismatch and the resolution in Analog Integrated Circuit (IC) Design, Layout and FabricationWeight 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)1 replies | 275 view(s)
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19th September 2019, 14:40std_match replied to a thread Extracting energy from gyroscope precession in Mathematics and PhysicsThe "reaction" force is perpendicular to the movement, so no work is done. However, your arms apply a horisontal force, and there is a horisontal...84 replies | 3513 view(s)
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