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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 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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38 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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42 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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72 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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132 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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78 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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62 views

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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137 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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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 ...
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44 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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44 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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65 views

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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93 views

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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51 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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88 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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92 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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51 views

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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130 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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55 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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21 views

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
189 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
59 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
100 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
70 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
21 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
72 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 ...
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236 views

How can i create a dead time between two signals in Matlab/Simulink?

I have a curcuit which outputs two different pulse signals from two different "PWM generator(DC-DC)" block. I will apply these signals to two different mosfets. Thus I need to create a dead time to ...
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4answers
159 views

Delaying an electrical signal

I want to be able to delay the signal that goes from the cdi box to the igniton coil on my moped. I would like to be able to control the delay with something simple like a potentiometer, i don't need ...
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2answers
79 views

Meaning of the “pole” of a transfer function with time delay

I learned in basic control theory that we can determine the stability of an LTI system by the signs of the real part of the poles of its transfer function \$H(s)=\frac{N(s)}{D(s)}\$. For a rational ...
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1answer
79 views

Two phase latch max delay constraint [closed]

In this timing diagram, why am I not including tcpq, i.e. the latch clock to Q propagation delay?
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53 views

Question about a trigger input of a modern ARB/VSG (Vector Signal Generator)

Given a common setup: The green box is a PCB mainly consisting of a data acquisition device (ADC+RF frontend) which is controlled by a Spartan-6 FPGA. The ADC & FPGA use a clock from a Tektronix ...
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4answers
185 views

Maximum Clock Frequency

As an assignment for the HDL course I'm taking, I've to design an FIR Filter. The module consists of two a small combinational circuit which can be used to reset the module, another combinational part ...
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4answers
166 views

How to make a relay ON for few seconds after power goes OFF?

I want to make relay circuit that can remain ON if power is supplied but as soon power is cut off i want the relay to go OFF after few seconds atleast 10 sec.
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224 views

Calculating Phase/Time Delay induced by a 2-pole Bandpass filter? ie. Group Delay?

If you have a two-pole Butterworth bandpass filter described by a particular Q value (Q>0.5) and a resonant center frequency "f", is there any equation that will tell you the phase/time delay induced ...
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1answer
546 views

Lumped-element delay lines using LC circuit

I was told that the above circuit is used to delay signal. The time constant per element is t = sqrt(LC). The expression was provided by the book I'm reading, but it did not include how the time ...
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22 views

NE555 monostable timer circuit restart timer when trigger grounded in between [duplicate]

I had made an NE555 timer IC based delay circuit (monostable mode) which keeps output HIGH for 10 seconds when trigger pin is connected to ground momentarily. But what I want is if I ground trigger ...
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6answers
2k views

Delaying a TTL signal

I need to design a circuit to delay an input signal by a given amount of time (around a second, trimmable). The delay should be set through the use of passive components (resistors or capacitors). The ...
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2answers
450 views

Low pass filter [DELAY]

Ok guys, I can't understand a thing, why a low pass filter will delay only a signal with an high frequency?If I have a RC low pass filter, why the delayed band is only the band that has an high ...
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19 views

Switching timer delay, non accumulative

I am a real noob at this and I haven't been able to find my answer anywhere. I am trying to build a 555-timer that delays the switch of an input signal, both ways. When input goes high there should ...
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1answer
160 views

Group delay and phase delay of a filter

Maybe this question does not belong here but here, but since this webpage is for electric circuits in general and not for LTI systems that is why I post it here. I have to compute the group delay ...
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1answer
123 views

response / change time for BMP280

I am new to reading electronic datasheets. The BMP280 (https://www.amazon.com/Adafruit-BMP280-Barometric-Pressure-Altitude/dp/B013W0RR6Y) has this datasheet: https://cdn-shop.adafruit.com/datasheets/...
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3answers
206 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 ...
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1answer
295 views

MCP2210 (Microchip) has delays between chip select to data, data to data

I am using MCP2210 in my project to communicate with a processor (TMS320F28377D from TI). For tests, I use SPI Terminal programm from microchip. However there are some issues. There are some ...
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4answers
302 views

RC Delay Ciruit for Pi power on

I am a bit electronically challenged and need to hold an input pin high for about 8-10 seconds. I am implementing this solution: https://github.com/NeonHorizon/lipopi/blob/master/README....
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149 views

Delay in the given circuit

at t=0 , a and b change from 0 to 1 and t = 1, a and b change from 1 to 0. what should be the output of f at t=2 ? (basically does the gate drop the current calculation if the input change within the ...
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303 views

555 Monostable when switch is held for a period of time

I have a problem with the 555 delay before turned-off. The problem is that I want the time cycle to start after the switch is released if it was held for a period of time. I found this circuit at "...
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2answers
172 views

how to get fractional delay in picmicrocontroller

i am using 4MHz clock for pic18f452. therefore, 250ns is 1 instruction cycle. is there any way to get a delay of 375ns? using timers, i cant define count in fractions. using inbuit delay function ...
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160 views

Is it possible to delay a counter?

This is my D - 0 Down counter using D-FFs. Currently, what would happen if I ran it would be that it starts counting down from 3. Upon counting down to F, this toggles the NAND gate, which resets it ...
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139 views

How to create a pulse using 555 when the push button is released (“dead man” switch)?

I want to make a "dead man" switch using 555, basically 555 will generate a pulse only when a push button is released (you push the button and nothing happens until it's released). Two days of ...
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1answer
728 views

calculating propagation delay

We assume that every gate's delay is (microsecond). what is total propagation delay?