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Type: Posts; User: wwfeldman

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  1. Closed: Re: Enable circuit for backup battery boost converter

    is the enable high or low?

    assuming enable is high, connect two resistors in series from 8V source to ground
    connect the collector of an NPN transistor to enable
    connect base of said transistor...
  2. Closed: Re: Help needed; Check of PCB and some other questions

    in post #4 BradtheRad suggested making modules of the sensors so the PWB in not so long and narrow

    i agree
    you can connect the modules with twisted pair wire, which will significantly reduce the...
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    [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...
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    [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
  5. 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
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    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...
  7. 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...
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    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, ...
  9. 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...
  10. 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...
  11. 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 (?)...
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    Closed: Re: how to make diy inverter

    your best bet is to go to the laptop manufacturer's website and
    buy a new charger

    you know it will work
    it will be faster and easier
    and, it is likely that in the long run it will cost less
    ...
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    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...
  14. 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
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    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...
  16. 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...
  17. Closed: Re: Circuit that detects when an external event induces electrical energy

    @Brad
    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...
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    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...
  19. Closed: Re: what if i connect a battery to the electromagnet?

    only rely on manufacturer's specification
    NOT on advertisements
  20. 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...
  21. 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...
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    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...
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    Closed: Re: Remote Control PA1000

    see page 42 and 43 of the manual
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    Closed: Re: Super capacitor electrolyte problem

    are you asking about a super capacitor or an electrochemical workstation?

    if you're asking about a super capacitor, please provide the manufacturer,
    the manufacturer's part number and a link to...
  25. Closed: Re: How FM transmitter/radio works with crystal? What to read?

    a start:

    from http://www.arrl.org/
    ...
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