Questions tagged [delay]

In electronics, a delay is an amount of time between two events. For example, the time between input and output of a signal in a circuit could be referred to as the processing time, or the delay. Sometimes delay is added deliberately, as in certain audio effects.

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Simple voltage dependent on/off-delay switch circuit

I have a set of security cameras powered by a solar powered battery bank. (4S5P LiFePO4 batteries charged by a 100W solar panel). As the voltage varies depending on charge level and how sunny it has ...
KristoferA's user avatar
2 votes
3 answers
201 views

Tightest finite wait loop possible in AVR8

I need a wait delay function with fine grained control of the delay. I came up with the fairly standard way ldi Rx, N lp: dec Rx brne lp This ...
Peter Rottengatter's user avatar
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2 answers
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A simple delay ON circuit

https://www.homemade-circuits.com/simple-delay-timer-circuits-explained/ I've got a problem with designing a circuit. I've made a box that uses a current sensor module to detect when 230 volt current ...
Stu Boyd's user avatar
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Timed momentary switch modifier

I would like to design a circuit that adds a power off delay What would you suggest, is it possible to solve that basing only on the circuits batteries? Modifier from the market uses own 9V power ...
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Propagation delay of ripple carry adder

I am having a hard time grasping the propagation delay of the full ripple carry adder. Suppose I have n adders and for each adder, the inputs are An, Bn. Please help me with this question: As the ...
footycrazy's user avatar
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3 answers
55 views

RC delay timer to power LCD

I'm looking turn on the power of an LCD screen from a Pi Pico with a short time delay (50-100ms) after the Pico is plugged in. I want to power the screen with VCC from the Pico (5V) and use a signal ...
printsmith3d's user avatar
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1 answer
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RC delay circuit for delay

I want to switch the contacts of a relay after aprox 1 second. I've never done something with a relay before, so please can you check if I understand the specs correctly? This is the one I saw https://...
jmann's user avatar
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AC delay circuit question

Sorry if it's a stupid question but.. is there any AC delay circuit? All I know is RC and RL circuits but are based on DC current For example, to delay for a second the triggering of an AC relay ...
jmann's user avatar
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NE555 Delay On Off Timer Schematic

I'm trying to make a timer that turns on at a certain time and turns off after 3 seconds, i found a circuit in youtube and made it in proteus, but the output is not the same. Is there a problem with ...
Noobielectrix's user avatar
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Why do I need multiple segments to model the RC flight time of interconnect?

Consider a problem where we are interested in computing the delay for a signal to propagate to some load capacitance after a step input on the driving logic gate, and let there be a nonnegligible ...
EE18's user avatar
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Does minimizing stages necessarily give best outcome when designing circuit under a delay constraint?

In the context of digital design, a common situation is to have to design a circuit for minimum energy under a delay constraint. Suppose a given circuit can be implemented with various stages. Is it ...
EE18's user avatar
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Can I use a different channel of a timer at the same time?

I am using AVR128A for a project. It comes with two 16-bit timers (Timer 1 and Timer 3) and two 8-bit timers (Timer 0 and 2). Timer 1 has two channels whereas Timer 3 has three. I have all the timers ...
RK Eshat's user avatar
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Why I am getting one clock cycle delay in Verilog case statement?

I have a Verilog code here: ...
Seforo's user avatar
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Delay with timers for a non-blocking delay

I need microsecond/millisecond delay in my project but I don't want to affect the process flow. I am using an STM32G4. I am using a timer for microseconds delay. This is the function: ...
Sireesha's user avatar
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2 answers
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Delay logic of an optical sensor

I have a simple optical sensor that has 3 pins: Power (5V), Signal (5V when not triggered), and Ground. When the sensor is triggered, the signal goes to 0 V. I need to constantly delay the signal by a ...
Pyper's user avatar
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555 delay timer before powering PCB with 5 V [closed]

I am wanting to know if the circuit below looks correct for using a 555 delay timer to take ~5 secs before applying 5 V to the rest of the board? I'm not sure if I have the correct wiring for it to ...
StealthRT's user avatar
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Verilog- Why is my state machine output arriving one clock cycle earlier?

I'm writing a Verilog code for a state machine with 4 states. state 0 is buffer time of 1 microsecond. state 1 is trig pulse for 10 microseconds. in state 2, the input is read. If the input is high ...
Milli_Wizard369's user avatar
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Combining two RC time delay circuits to generate both LOW and HIGH pulses with two push buttons

I have come up with the following circuit that can be used to momentarily generate either a LOW or HIGH pulse based on what push button is pressed. Can you please tell me if there is any issues with ...
David Refoua's user avatar
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1 answer
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Easy way to delay watchdog POR, but ensure that one line is instantly pulled into reset

We have a CPU, and then several IO expanders. When the watchdog timer expires, we need the IO expanders to go into reset (inputs) instantly, otherwise bad things will happen if they stay configured as ...
Shaken_U's user avatar
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Optimizing Solenoid Control Circuit with FETs: Minimizing Inrush Current and Hold Current Precision

I'm creating a circuit using two FETs. The first FET (U2A) is responsible for controlling the inrush current of the solenoid, and the second one (U2B) is used to maintain the predetermined hold ...
mastermind's user avatar
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1 answer
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MSP430 i2c txn buffer not moving second buffer command

In this code i have used B0 I2C module. Problem - I f i I2C_Txn_byte() to send any command it sends the it the first time but doesn't get in the interrupt ISR again for Example ...
SlickDaDDy's user avatar
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3 answers
285 views

MSP430 delay using timer with polling condition

Need help with this code, it is not creating any delay. I tried simulating this code in Proteus. ...
SlickDaDDy's user avatar
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0 answers
49 views

Designing a Delayed Load Switch Circuit for Voltage Transfer on a PCB

I am seeking guidance for the design of a circuit on a PCB board. The intended function of this circuit is to facilitate the transfer of a 24 V voltage from the input to the output through the ...
Knowledge's user avatar
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LMC555 delay off timer, M20 motor drive, updated

The goal is to either just give a signal to the motor with momentary switch, or turn on the toggle switch, let 3.7V motor run for a couple of seconds before 440uF is fully charged, after which voltage ...
Domenico's user avatar
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Elmore delay resistances

I know this question has already been asked enter link description here, but honestly I did not find the answer exhaustive, so I am going to ask it again, in a more specific way. WHY in the Elmore ...
Urza_tron's user avatar
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"Delay Relay" or better "Ignore Relay" advice

I have an inherited project that is baffling me. (I am NOT an EE.) TL;DR: need to ignore the signal voltage for the first 45 seconds (upon power-up), then allows all signal voltage there after. ...
rag-Gnar's user avatar
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3 answers
81 views

Which waveform leads the other: A or B?

If you only look at the waveforms A and B below, can you determine which one leads or lags the other? One person argues that A leads B because the first rising edge of A occurs before the first ...
internet's user avatar
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Estimation of delay in digital circuit

I found this way to compute the High-to-Low propagation delay. How would this model be modified if instead of Having only a Cload after the transistor, there is a L-shaped RC segment (a low-pass first ...
Urza_tron's user avatar
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5 votes
5 answers
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How does a processor know the amount of time it should hold the address on the address lines

How does a CPU know how much time it keeps the address on the address line or even data because considering the CPU relies on clock to sync its operations. I've seen the datasheet of the 6502 ...
John greg's user avatar
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2 votes
1 answer
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PIC- Analog Digital Converter ( MPLAB - C )

I had a problem with some code where I had to convert analog to digital using my PIC24HJ128GP506A microcontroller. As you may know, the microcontroller uses Successive Approximation for conversion, ...
O_DERE's user avatar
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Delay 12v impulse then send it to controller

I have a problem with a circuit that would delay me a signal received from an external source. From the beginning - I need to build a circuit that will give the driver a HIGH signal. This signal is ...
Siemekk's user avatar
3 votes
1 answer
671 views

Why do buffers decrease delay?

Lots of people break up wires into stages to decrease RC delay. This makes sense to reduce the wire L and thus capacitance, but doesn’t the time for the signals to propagate through the buffers add ...
Devon Cantrell's user avatar
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Theoretical calculation of gate delay

I am currently working on not-gate based ring oscillators and I was wondering if there was a way to theoretically calculate without having to look at the simulation graphs the rise time and fall time ...
KaBe2003's user avatar
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1 answer
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Delay ON signal from sensor (NPN)

I have sensor (slotted IR optocoupler) that has IR diode and IR detector (transistor), where emitter is connected to ground. On device side I have connector with 3 pins - Vcc, GND and signal line, ...
GregorK's user avatar
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0 answers
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STM32_2 Phase shift

I did PWM for 2 Phase. It works great, but after I stop my Timer Master and Slave in order to have Delay, I mean with HAL_TIM_PWM_STOP, doesn't work my timer slave ...
David's user avatar
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0 votes
1 answer
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555 IC 1 minute delay timer not working in simulator

I have a problem in Falstad that when making a 555 IC based signal delayer that should delay a power-off of a certain device, that the whole circuit behaves really weird and doesn't work as stated by ...
Marek Bílý's user avatar
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1 answer
418 views

Using Timer Interrupts Instead Of Delays in PIC Microcontroller

I have this task where I have to use timer interrupts intead of delays (for efficiency purposes) in this 7 segment display circuit with PIC18F4620. Here is the circuit: Display is common anode. I ...
Line Follower's user avatar
1 vote
1 answer
80 views

Propagation Delay of Sequential Logic Circuit

I'm trying to work through the above sequential logic problem from MIT OCW's Computation Structures course. However, I'm having trouble calculating tpd of the Zero output. I'm a complete novice at ...
Coder1913's user avatar
2 votes
1 answer
58 views

I need a simple circuit to provide about a 2.5 second power-on delay to a 5 volt mini relay 6 volt DC supply using a RC/Zener to 2222 base lead

I've tried various circuits with the result that the 2222 transistor fires up the relay instantly ... The relay coil is 46 ohms I'm using 4 AA cells for 6volt DC supply, a rectifier diode to control ...
The Barrel7's user avatar
1 vote
1 answer
354 views

RC delay; more resistance or more capacitance?

Consider the following RC delay circuit, meant to accept short input pulses without triggering, but to trigger on a continuous input: simulate this circuit – Schematic created using CircuitLab ...
Matthew's user avatar
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1 vote
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TFT LCD voltages and sequencing

In the recent project I am working on I want to connect a TFT LCD to ESP32-S3. I would be using the LCD hardware interface of ESP32, so I only need to take proper care of display power management. The ...
fafaldo's user avatar
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1 vote
3 answers
209 views

Delay.h on ATtiny45 vs. ATtiny461 in Microchip Studio

I noticed that the Delay.h wasn't working well in a project when used with an ATtiny45, so I've made a small piece of code to test where I went wrong with my coding. I've just made a blinky-LED ...
Ksack's user avatar
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2 votes
1 answer
144 views

Capacitor discharging in a low power active-high pulse circuit

Team, Thanks as ever for your wonderful support. Long time listener, first time caller. I trying to make a low power active-high pulse (4-8sec RTC interrupt) when a switch is pulled to ground for up ...
Planestoner's user avatar
4 votes
1 answer
190 views

Delay for low-pass filter to give proper mean value of a periodic signal on LTspice

I noticed that I have a 4-5 seconds delay before the output of my low pass filter op amp gives the correct mean value of an input square wave. Is it normal for the delay to be that long and if so, are ...
c.leblanc's user avatar
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0 votes
2 answers
81 views

Reversing a motor after momentary switch is opened

I want to build a circuit that turns a DC motor clockwise when a momentary switch is held. After the momentary switch is released, the motor should run in anti-clockwise for a few seconds (3-5) before ...
harveyslash's user avatar
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0 answers
37 views

Create delay time for next trigger/ring

I'm interested in a push switch (220-240 V) which when assigned to a specific time (let's assume the delay is 15 s and the application is a doorbell). Scenario: Guest arrives and pushes or holds or ...
Mathurshan's user avatar
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50 views

What is the difference between adding capacitor in 2 different ways to create the delay?

I’m finding similar delay results for both the circuits shown below. Draft 1: Capacitor C3 and C1 are connected to separate branches, though both of them together determine effective delay. Draft 2: ...
Dynamic_equilibrium's user avatar
0 votes
1 answer
143 views

Delay to a MOSFET switching

I have a very simply circuit which, when the sensing lines contact water, switches a relay. The circuit performs well on 12 to 15 VDC. I want to add a delay of approximately 3 seconds to the circuit ...
Michael Lavery's user avatar
1 vote
1 answer
221 views

Logic buffers with discrete propagation delay

I want to have a circuit (for this matter a logic buffer) with a discrete propagation delay. It can be 5 ns, 10 ns or 15 ns, but I want deviations to be within 10-20% of these values. Where do I start ...
TQQQ's user avatar
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How do I turn a LED off after a certain amount of time? (555 Timer or other solution?)

I want to turn off a LED after 10 seconds of power to the circuit. The problem is all the solutions I can find are using push buttons to trigger a 555 timer, but I want to have it start the 10s timer ...
Ben's user avatar
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