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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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How to use libraries with delays inside within a time critical STM32 HAL application?

I want to use a library for an LCD for STM32: LiquidCrystal, and possibly some other libraries. I noticed this library is full of HAL_Delay calls, not only during initialisation but also during ...
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AVR SPI stops clocking if the main loop contains a delay

I have a weird issue here using an ATMega48: ...
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1answer
68 views

555 timer delay circuit + light sensor?

I am quite new to electronics and I would like to combine these 2 circuits together so that during complete darkness on the LDR, the LED would turn on instantly and when light falls on the LDR there ...
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NE556 timer dark sensor with turn off delay?

I am starting a project for myself. A night light which turns on when no light falls onto the LDR sensor, and turns off after 1 or 2 seconds when light falls back onto it. I must incorporate the NE556 ...
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64 views

Fastest temperature sensor for a bimetallic strip

What is the best approach or sensor to analyze the temperature of a bimetallic strip? From experimental data, the temperature swings due to a current flowing into the bimetal, are up to 80°C in a ...
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1answer
23 views

CMOS IC Dynamic Edge-Triggered Flip Flop setup and hold time calculation

Before explaining i should point out that i refer to changes of signals in the text as a reference change on which i will calculate these times as 50% change of one signal to 50% change of the other ...
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1answer
39 views

Eliminating power-on state changes caused by input signal fluctuations

I have a circuit that uses several comparators to read an analog input signal and control some downstream digital logic. When the device powers up, the logic states fluctuate because the input signal ...
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74 views

Need help to identify this timer

This device is installed in our electrical panel which act as a timer to control the on/off operation for our LED billboard outside my office. I searched around the device for the brand and model it ...
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Propagation delay in full adder models

From my last question Propgation delay I tried to solve for the time delay that occurs at the last carry Not sure if I have done it right .. Please correct me if I m wrong
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What is the effect on propagation delay when we have a CMOS circuit with multiple transistors connected in series?

How does the fact that in a series connection of two or more transistors only one is connected directly to gnd (in case of nmos transistors) or vdd (in case of pmos transistors) effect the change of ...
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2answers
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Xilinx's ISE (GSR): The initial block adds a delay of 100 time units to simulation

I'm working on a lab assignment in which I'm supposed to simulate a sequential logic circuit (A ROM device). I'm using xilinx's ISE as IDE. My implementation works fine and the logic and the data is ...
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1answer
124 views

Delays using Timer in stm32

I am currently trying to achieve delay of 1 uS using timer in stm32 for my application purpose. SYSCLk is set to 16MHZ LSI and define same for timer clock. Timer used is a 16 bit timer. The logic I ...
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Difficulty understanding group delay concept

I’m having difficulty understanding the concept of group delay. The mathematical definition is not difficult, since it says it is the negative derivative of Bode plot’s phase curve wrt frequency. Most ...
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Designing a deterministic-startup precise oscillator

The problem I need to reliably generate a sequence of events based on a digital input trigger signal. With minimal jitter and a predictable deterministic delay. 2 to 5 events The events will be from ...
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52 views

Distributed LC vs Distributed RC

The usual rule with LC circuits is to use the lumped model if the circuit is considerably smaller than the wavelength, or if the propagation time is considerably smaller than the rise time. With RC ...
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1answer
58 views

Micro controller clock speed requirement for delay measurement

I am trying to measure the absolute time between two 1Hz clocks (GPS PPS events) to within 50 nanoseconds. I do not necessarily care which clock occurs first, I am only looking for the delta T between ...
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1answer
49 views

Circuit turn on delay question

Check schematic below, On power on, I want to create a delay when the relay turns on of about 20 seconds. Once its on, it stays on until the power is cut. Timing accuracy is not important. Now I could ...
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Timing relay for delayed pulse

I'm trying to achieve this Tried many timing relays but couldn't find one with this function. There are ones to delay both rising and falling edges but it doesn't work when delay is longer than ...
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1answer
32 views

Delay pulse (trigger) for a variable delay respectively to 0-5V input

I have a circuit where i detect zero-crossing (Mains EU 230V 50Hz) with opto to arduino(interrupts). Then I need to delay (from 0 to 10 milliseconds) it to trigger Triac gate. but then I need another ...
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61 views

PIC12F675 micro controller programming

I want to use PIC12F675 to control a relay such that when a switch is pressed, it should generate an output signal which should be ON for 2 seconds and then OFF for 15 seconds. This should continue ...
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2answers
72 views

Non-shorting Rotary Switch “dead” Time

Is there a nominal dead time for rotary switches? Obviously all switches are different, so this value will not be precise. For making a reasonable situation, let us assume that a detent style switch ...
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2answers
117 views

Reversing Direction of a DC Motor with Delay

I am making a kinetic sculpture and the movement of it requires a reciprocating motion. I have made the designed such that a dc motor powers the movement of the sculpture, and a rotating beam that ...
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1answer
79 views

Delay turn off relay [closed]

I am an entry-level hobbyist. I am trying to find a delayed turn off relay for a light, but all the ones that I can find I don't understand how the switch fits into the equation. Taking this relay ...
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136 views

Delaying rising edge of input signal - 3.3v logic

I'm new here and I need help with my project. I working on my DIY home automation and I need to delay rising edge of the input signal. Trigger is faling edge. I need to delay it 100 - 500ms and I use ...
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1answer
93 views

How to understand Transmission and Propogation delay formula

I have three questions below. I would like to understand how their respective answers were reached, this is a question in my current class and everyone in the class has A-Level mathematics experience -...
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1answer
65 views

MOSFET goes into saturation mode much later

I am using IRLML6346 NMOS in LTSpice. Its threshold voltage is Vt = 0.95V. I plotted the graph of Vds(voltage between drain and source) vs Ids(Current from drain to source) for different values of Vgs(...
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117 views

How can I use the component CD4538 or a 555 timer on Multisim?

How can I use the component CD4538 or a 555 timer on Multisim for a delay of 1 second ? I want both of the nor gates to be 1 for roughly 1 second when the output of the op-amps is either 01 or 10.
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553 views

How to generate a single pulse using RC circuit from a fixed DC supply without any controller, timer or delay IC?

I have a DC supply (5 V) to turn some circuit on and in that circuit there is a module which uses a specific mechanism (i.e. a 2 seconds width high pulse) to turn on (even if a supply is connected, ...
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1answer
161 views

How can I make the design simpler?

I have designed a circuit and it is working. However, I think it is too complicated and can be changed or simplified. I might be missing something. I am finding hard to create a 1 second delay. A ...
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2answers
90 views

Project - How to onstruct a circuit to introduce and control a 0-300ms delay in an RF feed from a Sky Box to multiple TV sets? [closed]

Just bought a new TV! It's "smart" but where my previous dumb TV didn't, my smart TV introduces a delay over HDMI from my Sky+HD box compared to the RF2 output which is wired via coax cable to the ...
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2answers
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how to calculate the tpdhl / tpdlh for any given circuit

i am struggling on calculating the tpdhl / tplh i dont know how to calculate is there any algorethim for the way we calculate the time propagation high to low etc.. several questions asking to take ...
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1answer
392 views

STM32L0 - Delay in microseconds

I am using a B-L072Z-LRWAN1 board (which has a STM32L072 MCU) and I want to get data from a DHT11 sensor. To achieve this, I need a microseconds delay which I am not able to obtain. The libraries ...
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1answer
43 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 ...
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1answer
110 views

How to turn off 555 Timer for a period of time after Vout signal passes through

I have a single-shot 555 Timer. After triggering, output goes high for a period of time. What I would like to do now: After Vout goes high and then low again, I want to disable the 555 timer for a ...
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1answer
119 views

LTC6994-2 signal inverted and time delayed

I use LTC6994-2 to delay and invert input signal. I want 2s delay between input and inverted output. However, this is what I get on the output: Green waveform is input waveform. Output (Blue ...
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2answers
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Why inverse of time delay is non causal

Please explain the following statement "If \$P(s)\$ contains a time delay term, \$P^{-1}(s)\$ is non-causal". Here '\$s\$' is Laplace variable. Can someone please explain the reason of non causality?
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How do I decrease the slew rate of an op amp?

I need to reduce the slew rate of a voltage follower, so that if I change the input signal from 0 to 5 v, the output signal will rise progressively up to 5 v in say, about 5 seconds, so a slew rate of ...
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1answer
92 views

Altera Cyclone IV clock-to-output delay

Trying to find what is the clock-to-output delay for registers inside EP4CE6E22C6. Have looked through the 3 Cyclone IV handbooks searching by delay but have not found any values specified. All the ...
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1answer
96 views

Is there such 555 timer circuit?

I was wondering if there is a simple 555 Timer circuit, or even simple transistors circuit, that has a HIGH output for 1sec, 2sec, or more seconds when I trigger the input switch and will remain HIGH ...
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1answer
94 views

How to avoid this voltage when I turn on the circuit?

What I want to do is an Delay ON, but when I press the switch this voltage pass for a brief moment and turns the led on for a moment. How can I avoid this? Should I put the switch somewhere else? ...
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Physical significance of positive group delay with negative phase delay

This question is an addendum to: Is group delay the same as the delay of a certain frequency? Lately, I've been going back to basics to better understand the concepts of group and phase delay, so I ...
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2answers
206 views

Is group delay the same as the delay of a certain frequency?

I know that group delay is the delay of the envelope, or the derivative of the phase with respect to \$\omega\$. What I want to know is what exactly happens in the time domain. For instance take the ...
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118 views

SDF back annotation in systemVerilog design using interfaces

I have a DUT which is encrypted netlist and .sdf file (normally we do functional and timing simulations with these inputs). I used interface feature in SystemVerilog so I don't define any port for the ...
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HM-TRP radio module works at 56K data speed but only in delayed chunks

I created the following setup: I created one circuit in which the PC connects to an HM-TRP radio module via a max232 DIP IC. This circuit for the test is the master to all devices and sends a 16 byte ...
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2answers
328 views

how to resolve large combinational logic delay?

I am new to systemverilog. Recently I am working on a project for decoding a data stream from a AVALON_ST. Using systemverilog. My target device is Stratix V and the clock is 200Mz. ...
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3answers
70 views

Delay Low Signal, Fast High Signal

I have an active low circuit. I'd like to delay the low signal input when the it gets tied to ground, but allow the input to come up instantaneously when the ground is released. I've tried adding a ...
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1answer
195 views

How to change the delay variable Td for a tline component in LTspice?

I want to change the transmission delay-time Td (see picture) of a tline-component in LTspice as a function of time during simulation. From my understanding, I ...
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1answer
87 views

NE555 Circuit stops working after random time

i finished my NE555 circuit and created some pcbs. After a few attempts i could get the circuit working, and tested it successfully. I placed my circuit between a 12V 1.5Hz square wave signal and a ...
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1answer
26 views

Calculating required delay before pin value is recognized in 8051

I looked at the following in hopes my question will be answered: can we use 8051 pin as Input and output at a time? But the answer was vague. It stated: "though there is a 'strong' source ...
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1answer
77 views

Strange behaviour of ne555 + pmosfet circuit

I was a silent reader for a long time and could solve all the problems on my own, but this problem is really freaking me out. I was messing around until 3 AM today with this "feature" and still don't ...