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Questions tagged [time]

The tag has no usage guidance.

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0answers
18 views

How long will this power bank last? [duplicate]

I'm new to electronics, so I apologize if I use some terms wrong. The device I want to power needs 300mA. The power bank I have is rated at 2000mAh. How long will it last? I am not sure whether I ...
1
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1answer
33 views

Byte-Banging 2 8051's using port addresses

Currently I have two microcontrollers setup in which entire ports are connected to each other (P1.1 connected to P1.1, P1.2 connected to P1.2, etc). I also have two pairs of extra GPIO pins connected ...
4
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0answers
82 views

“Leeching” clock information from cell towers

I understand that cell base stations transmit very accurate time signals among other things. Do you need a SIM card and an account to receive this information, or is it something you can "leech" with ...
0
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1answer
35 views

Programmatically determine the lowest waiting time for character LCD display

I made working code in an older microcontroller for a character based LCD that's based on the HD44780 chip. My code stops execution of everything else every 70uS to display one character from the ...
0
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0answers
21 views

Measuring non-linearity in carry-chain based FPGA TDC

I'm trying to check the non-linearity of field programmable gate array(FPGA) delay-chain based time-to-digital converter(TDC). I used the code density test in the article below to measure differential ...
2
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1answer
61 views

RL circuit: How to determine the equivalent resistance of the circuit?

So I'm working on an RL circuit and the solution is stated to be that R1 and R3 are in series, but I didn't think that was the case because they don't have the same current through them. Given ...
1
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1answer
82 views

Activating a circuit based on change of resistance

I am looking to use a sensor, such as photoresistor, to activate a circuit only when there is a significant change in the input. Such as when the light incident on the photoresistor changes ...
2
votes
2answers
246 views

Are Civilian GPS signals cryptographically signed?

As far as I understand, receiving enough GPS signals at the same time enables to deduce the position and the time. So I guess it is possible to use an offline receiver as a very precise clock? If so,...
0
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1answer
80 views

How is rise/fall time definition

I understand that rise/fall time are related to RC charging/discharging waveforms. What I don't understand is how is the 0% and 100% points chosen? Do they have to be defined beforehand for a signal?...
6
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2answers
534 views

NPN transistor slow to turn off even when operated outside of saturation region

I am currently studying how transistors react and behave to simple signals. I have the following circuit: A square wave of approximately 83kHz is applied. The transistor used is a 2N5551. The ...
0
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1answer
52 views

IEEE 1588 PTP phase and time synchronization

Why everywhere is said that PTP synchronize phase and time together? phase and time are totally separate concepts. does it mean after using PTP rising edge of slave and master clocks happen ...
-1
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1answer
101 views

Voltage time graph integration

In a Voltage time graph , at constant current I= 170 amps, voltage=0 to 5,5 and time= 0 to 97 sec and voltage decreases from 5,5 at 0sec to 1,16 at 97 sec, now how can I find the total power ...
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2answers
162 views

Change a quartz clock timebase by changing the frequency of the quartz crystal oscillator?

I've been doing some research on rewiring clock circuits for a project, but I'm new to these types of pulse-counting circuits. My question at this point is: If I replace the existing quartz crystal ...
2
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2answers
94 views

PIC period measurement sometimes 1 overflow count wrong

Short info: I'm using a PIC18F4580 to measure the period time of two positive pulses using the CCP 1 on the MCU. And then writing the result to an LCD. When testing I sometimes get a result thats one ...
0
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1answer
47 views

Confusion about power in an RC circuit

Funny this is my third question in a row about RC circuits, but I wanted to figure out some stuff I'd been wondering for a while. What I was confused about the power while charging. Like say that ...
0
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2answers
76 views

Is it possible to speed up Battery simulations with power converters in Simulink?

I am facing a huge problem with real-time analysis of a PCS simulation. I want to simulate a power converter system, which can be used as a power converter. I have to do an accelerated simulation with ...
1
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0answers
78 views

Can someone please help me with this pipelining question

A pipelined implementation of the circuit shown below is to be designed. The delays of the building blocks are indicated inside circles. You are given buffers with a delay of 0.5 ns, and flip-flops ...
3
votes
3answers
189 views

Calculating R and C for schmitt trigger debouncer

I've been looking all over the internet to try to figure out the optimal values for R1, R2, and C but couldn't find info. I'm trying to ideally make a debouncer that will work with any button on the ...
0
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1answer
54 views

RC time constant in circuit with two caps with different potential

I'm trying to develop a model for the switching speed of a MOSFET. In reducing the equivalent diagram I have come up with this circuit with a resistor and two capacitors in parallel. The catch is ...
1
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2answers
48 views

Interpreting results when IC temperature fits all categories

I have recently downloaded a datasheet for one of the chips I am using in my project, the familiar 74HC164 shift register. The datsheet URL is here: https://assets.nexperia.com/documents/data-sheet/...
1
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1answer
97 views

DS1307 : Long term effects, time gets corrupted

I have designed a PCB which has ATMega328P and one DS1307, along with other sensors on the I2C line. The design is as follows : Y2 is 32.768KHz crystal, and BT1 is a standard 2032 3v3 coin cell. I ...
0
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1answer
45 views

Approximating dynamics in continuous-time with discrete-time

I'm not sure if this is the best place to ask this question, so please direct me to the appropriate community if this question seems out of place here. I am working on a project in which I'm trying ...
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3answers
145 views

Is a 0.01s time base really useful in a frequency counter?

I am currently designing a frequency counter based on the PIC16F628A. It is working as expected but I would like to add some useful features. According to the images found by googling, I noticed that ...
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2answers
461 views

How create a high precision clock in an FPGA?

FPGAs can easily run at 100 to 500 MHz and create time resolutions of 10 to 2 ns. That frequency can be used to create timestamp counters, which are in turn used to create very fine grained time ...
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0answers
63 views

Oscilloscope Trace Appear Delayed

I saw a thing on my GDS-1052-U oscilloscope: if I set the time base to 25mS/div there appear a delay of the signal on the screen. So, when I rotate the knob for the time base to 25mS/div, there is a ...
1
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1answer
61 views

Absolute minimum delay required to process data across shift registers

In an effort to make my serial data processing faster, I attempted to use serial mode 0 with a system clock speed of about 3.686Mhz. Its clock comes from the ALE output of an unprogrammed at89S52 that ...
1
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1answer
293 views

How to use TIMER 2 as simple counter in STM8S103F3?

I am new to STM8S and not yet that good at microcontroller programming in general. I am trying to learn about timers/counters in microcontrollers. I wrote following code to toggle an LED in each ...
2
votes
3answers
444 views

Making a radio-controlled clock work from a local time signal

Is it possible to modify radio-controlled clocks (so-called "atomic" clocks, like https://www.amazon.co.uk/Wall-Clocks-Radio-Controlled/s?ie=UTF8&page=1&rh=n%3A376322011%...
6
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2answers
356 views

Calculating Slew Rate from a time-constant

I have to choose an OP-AMP mainly based on slew rate. I am using the op-amp as a differential comparator with dynamic (time) hysteresis with a time-constant 3*tau=500µs. My upper threshold of the ...
0
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2answers
105 views

Mistake in calculating the last time of battery (Ampere hour problem)

I've a question about the mAh rating of batteries. At the Dutch Wiki page of Ampère-uur which is the Dutch word for Ampere hour, they say for example a \$100\$ Ah battery can supply 5 A for 20 hours ...
0
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1answer
83 views

What's the difference between measurement resolution and digits per second in time measurement devices

In time/frequency counters/analyzers in technical specifications you can almost always find resolution and digits per second values next to each other. What is the difference?
-3
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1answer
71 views

Are there any transparent photoconductors? [closed]

Are there any transparent photoconductors? If so, can I know the timeframes of some examples of them where they reach full conductivity? I need one that reaches full(or approximately full) ...
1
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2answers
260 views

Extracting phase-shift and gain from a time series information

I have many files consisting input and output voltage signals for a linear filter circuit. For each file the input and output signal is at different constant frequency. All sampled for 2 sec duration ...
-1
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1answer
153 views

Is there any real-time task set which includes WCET on both CPU and FPGA for every task?

As it has been proven, every task (application) we can run on a CPU we can also run on an FPGA (even if that is just by building a soft CPU). In addition, there is not any rule (or relationship) ...
0
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1answer
48 views

Form differential equation pair from discrete time system block diagram

I have a discrete time system block diagram. And my question is what is the output y(k) I managed to get what is V(k) $$V(k)=\frac{1}{2}*V(k-1) +U(k) $$ But now i can't form y(k) because ...
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0answers
55 views

How to test if a discrete system is causal or non-causual?

I know like this might seem like a trivial question but I am a bit confused with it. Take for example the the system y=x(n-10). Initially I thought this system was noncausal because n-10 means that ...
0
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1answer
114 views

My RC Time Const. Calculations are wrong. Circuit changes my input signal

I have a simple RC circuit of 22 ohms and 3.3uF My measured values put the resistor at 22.10 ohms and the cap at 3.15 which gives me a time constant of 68.5 uS The signal applied is a 100Hz Square ...
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2answers
202 views

Safety of current with duration [duplicate]

My question is about how dangerous a momentary amount of current is vs the duration. Like is there a reasonably consistent relationship between current duration through the body and relative danger? ...
0
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1answer
43 views

adjustable time delay, random output

I am looking to build a circuit that would control an output relay. This would be done in 12V and the sequence will be initiated by a manual switch. I will need an adjustable time delay (possibly ...
0
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2answers
200 views

Charge time capacitor in a BJT collector with a parallel resistor

Hello, Given that circuit that has a constant current(let's say 3mA), How do I determine the charge time of that capacitor? since in t=0 the capacitor would have all the current but later it will ...
1
vote
1answer
702 views

Capacitor with Current Source in parallel with a resistor

[![enter image description here][1]][1] I know that in a current source in series with just a capacitor (without the parallel resistor), it would charge until forever in an ideal case with the fomrula ...
0
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1answer
5k views

STM32F20x ADC sampling time/rate

I need to calculate the exact sampling time or sampling rate for my setup on a STM32F205. I have the ADC setup as follow: ...
0
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1answer
62 views

Use 555 timer to output same interval as user presses a button

I was curious if such a circuit already exists tentatively using 555 timer chip (I know I can do this with a micro controller so please don't suggest that). Basically I need following functionality: - ...
-1
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1answer
110 views

electrical appliance on battery [closed]

hey guys i have a Intel nuc 6i3syk , on the back of it it saying that it needs 19V and 3.43A , that its fine as long i am indoors , my wonder its how do i make it run on 3.7V batterys , I got 10x ...
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1answer
8k views

How long will a 12v car battery last using a 100w lamp only? [duplicate]

Is there a specific formula where I can compute how many hours before my 12v car battery becomes fully empty when using 100w light bulb only?
0
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3answers
554 views

Time delay on circuit

I'm trying to build a circuit with the following properties: When a switch (SW1) is pressed continuously, it should supply a particular load with 5V (modeled as R4 and LED D2) after about 20sec When ...
3
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0answers
240 views

Wait make the STM32L073RZ freeze in stopmode

With my STM32 I'm trying to configure a deepSleep mode and use RTC to generate interruption (actually each 30 seconds). When my STM start, this one configure the RTC and directly go in Stop mode. ...
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1answer
125 views

Whats the difference between an FPGA and an ASIC [closed]

I know what an FPGA and ASIC are. However what I want to know is what is the difference with cost and time. How long does it take to build an FPGA? How long does it take to build an ASIC? How much ...
0
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1answer
150 views

How can i calculate the time that is elapsed between two sensors in vhdl?

I am new to digital design and having trouble in calculating the time between two sensors that gives digital output? How can i approach to this problem? I thought of writing the outputs of digital ...
1
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1answer
93 views

Implementing a simple 1/s integration in PSCAD while it only offers 1/sT

So I'm doing some modelling in a power systems simulation software (PSCAD) I'm using the integrator block in that software. Now unlike SIMULINK PSCAD doesn't offer a \$ 1 \over s \$ block but offers ...