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Type: Posts; User: wwfeldman
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Yesterday, 18:36
- Replies
- 9
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- 186
Closed: Re: LTspice...splitting LT1243 output into two separate pulse streams
maybe a part designed to do what you want
rather than forcing a square peg into a round hole
if you want to build this, you'll need to add a variety of hardware to make it work
including high... -
Yesterday, 16:31
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- 9
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- 186
Closed: Re: LTspice...splitting LT1243 output into two separate pulse streams
the rising edge of the LT1243 clocks the DFF, s both transistors "switches" are on at the same time -
one turning on and one turning off
shouldn't QQQ and QNOT go to the switch controls, SSS and... -
Yesterday, 15:29
Thread: Solve Equations Verilog
by wwfeldman- Replies
- 9
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- 437
Closed: Re: Solve Equations Verilog
in post 1, its a^7, in post its x^6 ?
the number of roots is equal to the highest exponent, so 7 roots and 6 roots, receptively
if all you want is a solution, then use Wolfram Alpha
type in... -
Yesterday, 15:12
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- 186
Closed: Re: LTspice...splitting LT1243 output into two separate pulse streams
please show how you want to connect/use the D FF
i expect you'll need to connect the current sense
i would suggest a half bridge controller, maybe even with a high side driver built in
maybe... -
6th December 2019, 18:45
Thread: Flow of Current in IGBT
by wwfeldman- Replies
- 7
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- 352
Closed: Re: Flow of Current in IGBT
current path through IGBTs looks ok
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6th December 2019, 15:09
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- 4
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- 294
Closed: Re: Confusion with relating the sensor output voltages from its datasheet
data sheet page 3:
Sensor Input Measurement range (typical) +/- 3.6g
Sensitivity (typical) 300 mV/g
Zero g Bias Level (typical) 1.5 V
These tell me that an output of 1.5 V means no... -
5th December 2019, 14:10
- Replies
- 7
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- 345
Closed: Re: Arduino based irrigation controller misbheaving at a particular site.
the surge protector will make a difference only if one or more of the MOVs are bad (low resistance or shorted)
are you using the same 24VAC 1A plug pack at home and at the "bad" location?
if... -
5th December 2019, 04:24
- Replies
- 7
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- 345
Closed: Re: Arduino based irrigation controller misbheaving at a particular site.
"The 3A DC to DC converter keeps shutting off due to the thermal over load protected being triggered."
what is it designed to use as input?
check that the bad location has that input
I blew... -
4th December 2019, 21:59
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- 5
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- 274
Closed: Re: how to determine the resistance of a running circuit
assuming your device has a power input and return, you can measure the voltage across those inputs
to measure the current, you need to disconnect the return and put in a resistor and measure the... -
4th December 2019, 14:18
Thread: Proteus PCB Component Problem
by wwfeldman- Replies
- 1
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- 212
Closed: Re: Proteus PCB Component Problem
see this thread components are stick together in pcb document
it started on November 12 -
3rd December 2019, 15:04
Thread: What do you know about ANSYS Medini?
by wwfeldman- Replies
- 2
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- 184
Closed: Re: What do you know about ANSYS Medini?
did you google ANSYS Medini?
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3rd December 2019, 01:39
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- 36
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- 700
[SOLVED]Closed: Re: Average vs RMS load-current for LDO design
in post 4, you said there are 10 identical digital blocks your LDO regulator is powering
if you have the current waveform for one digital block, since it isn't DC, use RMS to find a measure of... -
2nd December 2019, 17:41
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- 36
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[SOLVED]Closed: Re: Average vs RMS load-current for LDO design
I would size this LDO pass element depending on desired Vout, say 5V, drop out voltage, say 1V, so i need at least 6 V in
the current requirement has to be the maximum current the load will draw.... -
2nd December 2019, 17:25
Thread: Processor overheating
by wwfeldman- Replies
- 9
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- 659
Closed: Re: Processor overheating
now that its not summer, is it working ok?
the water cooling idea works if the case is sealed for water
you may want to look out for condensation inside if the water cooling is cool enough,... -
26th November 2019, 22:15
- Replies
- 48
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- 2,886
Closed: Re: 1MHz Timer Settings at STM32F767
so 108MHz/107+1 translates to 108MHz/108 ?
if so, just use 108, not 107 + 1
if it isn't 108MHz/108, then it looks like (108/107) + 1 = 1.00934 +1 = 2.00934 ?
108 MHz / 2.00934 = 53.7488 MHz... -
26th November 2019, 14:46
- Replies
- 2
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- 358
Closed: Re: output changes when I touch the enclosure
i see two possibilities
by touching the enclosure, you have somehow reduced the pressure and so the current goes down
0.04 mA is likely well within the design margins of the pressure transducer... -
26th November 2019, 14:41
Thread: resistor value and power calculation
by wwfeldman- Replies
- 1
- Views
- 256
Closed: Re: resistor value and power calculation
in the absence of a schematic, i assume the the load is in series with the resistor in series with the battery
therefore, your circuit looks like a battery with two resistors, all in series
the... -
26th November 2019, 02:14
Thread: Processor overheating
by wwfeldman- Replies
- 9
- Views
- 659
Closed: Re: Processor overheating
first, put it in the shade
then put a fan on the hot spot
there is some spot somewhere on the case that is warmer than the rest.
it may not be easy to find, so put a fan on it
put it on some... -
25th November 2019, 15:45
- Replies
- 5
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- 370
Closed: Re: Regarding UC3844 IC used for PWM switching
kindly show the entire schematic
the missing stuff to the right likely has a connection for Isense
that will aid in answering your question -
24th November 2019, 22:24
Thread: Why is CO2 a green house gas? [CLOSED]
by wwfeldman- Replies
- 5
- Views
- 1,575
[SOLVED] Re: Why is CO2 a green house gas?
i am not an expert in geophysics, atmospheric physics, ocean chemistry and physics etc etc
and i doubt you are
i have yet to hear from any source that the sun is behaving differently in the last... -
23rd November 2019, 19:57
- Replies
- 48
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- 2,886
Closed: Re: 1MHz Timer Settings at STM32F767
i am not very familiar with STM32F767
please explain notation 108-1 and 2-1 in
calculation prescaler should be 108-1, and a counter period 2-1.
please explain your calculation that got you... -
23rd November 2019, 06:18
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- 1
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- 486
Closed: Re: How can we simulate M/M/1 /∞ using C programming
i do not understand your notation
please explain M/M/1/infinity?
and for completeness sake, please explain "includes AVG. waiting and no. of customers ? " -
22nd November 2019, 01:00
Thread: digital integrated circuits
by wwfeldman- Replies
- 3
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- 321
[SOLVED]Closed: Re: digital integrated circuits
i do not see a question
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22nd November 2019, 00:57
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Closed: Re: Datasheet or Replacement for IC 2003 - BA234980509H
it might be less expensive to buy a power supply
it will certainly be less time consuming, especially if you include the time and effort already put in. -
18th November 2019, 14:34
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- 6
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- 365
Closed: Re: How can I measure AC current with ~500 kHz frequency?
try a pearson current transformer
https://www.pearsonelectronics.com/products/wideband-current-monitors
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