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Type: Posts; User: wwfeldman

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1. ## Thread: Delay time calculation

by wwfeldman
Replies
7
Views
333

### [SOLVED]Closed: Re: Delay time calculation

i looked in all three docs you posted and did not find what you're asking about.
where did you find

Clock cycles =(time delay) *(clock frequency/4).

see "Fine Resolution Phase Shift" page...
2. ## Thread: Delay time calculation

by wwfeldman
Replies
7
Views
333

### [SOLVED]Closed: Re: Delay time calculation

which processor, FPGA, or other digital IC are you using?
the answer is likely in the data sheet, buried in how the device handles the clock
3. ## Thread: Differential comparator with reference comparison voltage level

by wwfeldman
Replies
5
Views
393

### Closed: Re: Differential comparator with reference comparison voltage level

i'm going with it is a window comparator built from 2 comparators

like
http://www.ti.com/lit/ug/tidub01/tidub01.pdf

not 1 comparator with three inputs
4. ## Thread: Engineering in times of Covid-19

by wwfeldman
Replies
7
Views
793

### Closed: Re: Engineering in times of Covid-19

lol

i want to know where the "wipe down" stuff is and how it may interact with things like
an anti-static mat, antistatic wrist strap, scope probes, knobs on various devices,
wires, door...
5. ## Thread: Need Solution for voltage divider bias with two source

by wwfeldman
Replies
4
Views
415

### Closed: Re: Need Solution for voltage divider bias with two source

use superposition

the voltage at Vout is the sum of voltages at Vout due to the two sources

short source 1 and find Vout from source 2 = Vout from 2
short source 2 and find vout from source 1...
6. ## Thread: Engineering in times of Covid-19

by wwfeldman
Replies
7
Views
793

### Closed: Re: Engineering in times of Covid-19

my manager has determined that we are essential
started working remotely today.

in order to reduce contact and satisfy social distancing, only two of us may be in the office at any one time, ...
7. ## Thread: Probabilistic inference vs statistical inference

by wwfeldman
Replies
1
Views
486

### Closed: Re: Probabilistic inference vs statistical inference

i will make an attempt at your question
i am not an expert in either probability or statistics

statistics are derived from data
an example is test scores
your class takes a test, from that, a...
8. ## Thread: thought experiment to understand measuring equipment.

by wwfeldman
Replies
18
Views
641

### Closed: Re: thought experiment to understand measuring equipment.

@dl09
don't run away
we're trying to help

as you can read, everyone has a slightly different take on your question

but once you posted the drawing, everyone is on the same page -
the...
9. ## Thread: thought experiment to understand measuring equipment.

by wwfeldman
Replies
18
Views
641

### Closed: Re: thought experiment to understand measuring equipment.

60,000 V through a 1000 ohm resistor to a current meter and back to the
60,000 V return is essentially 60 A

if the meter is a voltmeter, then the current will be about 60,000 V / 100Meg ohm (?)...
10. ## Thread: how to make diy inverter

by wwfeldman
Replies
10
Views
568

### Closed: Re: how to make diy inverter

your best bet is to go to the laptop manufacturer's website and

you know it will work
it will be faster and easier
and, it is likely that in the long run it will cost less
...
11. ## Thread: how to make diy inverter

by wwfeldman
Replies
10
Views
568

### Closed: Re: how to make diy inverter

i don't think that's a good idea
you charger is designed for 120V AC, not a stepped square wave.

what is the output voltage of the charger - the voltage that goes into your laptop?

whatever...
12. ## Thread: What's the most durable PCB type and finish for exposed application?

by wwfeldman
Replies
2
Views
350

### Closed: Re: What's the most durable PCB type and finish for exposed application?

put the board in a box and add an environment appropriate bulkhead connector
use an appropriate mating connector on the other part
13. ## Thread: 120 VAC Power Conditioner

by wwfeldman
Replies
3
Views
414

### Closed: Re: 120 VAC Power Conditioner

please label the wires from the transformer, say 1, 2, 3, 4,...
measure the resistance of each pair.
the ones that are not part of the same winding will read open
the ones that are part of the...
14. ## Thread: Non Overlapping Clock Generator(4 outputs with same frequencies as the input clock)

by wwfeldman
Replies
17
Views
868

### Closed: Re: Non Overlapping Clock Generator(4 outputs with same frequencies as the input cloc

some frequency is input
and you get four output pulses at the same frequency, that do not overlap one another?

is there a specification for the separation of the output pulse?
or can one have...
15. ## Thread: Circuit that detects when an external event induces electrical energy

by wwfeldman
Replies
7
Views
500

### Closed: Re: Circuit that detects when an external event induces electrical energy

your explanation may be correct, but it doesn't explain why it happens every other falling zero crossing

i'm thinking its seeing chaos

at some lower frequency, there are no spikes
at...

by wwfeldman
Replies
14
Views
2,417

### Closed: Re: Confused about linear vs non linear DE

from https://math.stackexchange.com/questions/414597/linear-vs-nonlinear-differential-equation

from the next to last response:

"Linear Differential equations are those in which the dependent...
17. ## Thread: what if i connect a battery to the electromagnet?

by wwfeldman
Replies
10
Views
525

### Closed: Re: what if i connect a battery to the electromagnet?

only rely on manufacturer's specification
18. ## Thread: Circuit that detects when an external event induces electrical energy

by wwfeldman
Replies
7
Views
500

### Closed: Re: Circuit that detects when an external event induces electrical energy

kindly explain depletion wave
how high does that green spike go? are all of the green spikes the same height?
kindly zoom in on one of the green spikes at the sine wave zero crossing
what happens...
19. ## Thread: Solid polymer electrolytic capacitor more vibration susceptible than wet electrolytic

by wwfeldman
Replies
1
Views
239

### Closed: Re: Solid polymer electrolytic capacitor more vibration susceptible than wet electrol

depends on the failure mode

capacitor failures:
if you mount it vertically, the leads may stretch under vibration
and the actual capacitor inside the case may be stretched also
and it will...
20. ## Thread: Actuator control box problem

by wwfeldman
Replies
7
Views
700

### Closed: Re: Actuator control box problem

pull up resistor:

one end is tied to the voltage you want pulled up to
in your case, its the voltage to drive the gate of the FET to turn it on.

the other end of the resistor is tied to the...
21. ## Thread: Remote Control PA1000

by wwfeldman
Replies
2
Views
198

### Closed: Re: Remote Control PA1000

see page 42 and 43 of the manual
22. ## Thread: Super capacitor electrolyte problem

by wwfeldman
Replies
1
Views
373

### Closed: Re: Super capacitor electrolyte problem

the manufacturer's part number and a link to...

by wwfeldman
Replies
4
Views
452

### Closed: Re: How FM transmitter/radio works with crystal? What to read?

a start:

from http://www.arrl.org/
...
24. ## Thread: Large numbers of paralleled DCDC modules?...more than datasheet recomends

by wwfeldman
Replies
55
Views
3,367

### Closed: Re: Large numbers of paralleled DCDC modules?...more than datasheet recomends

instead of building the whole thing, build a scaled down version
assemble a 1.2 KW version - about 1/10th the power, so 1/10th the modules

one vicor BCM feeding 2 DCM
parallel to a not so...
25. ## Thread: Large numbers of paralleled DCDC modules?...more than datasheet recomends

by wwfeldman
Replies
55
Views
3,367

### Closed: Re: Large numbers of paralleled DCDC modules?...more than datasheet recomends

a tethered drone has an armored cable so the armor takes the forces/stress/strain of tethering and
the power/control/data wires do not

the armored cable can also relieve the static build up to...
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