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1answer
61 views

Simple question (I guess): 555 timer

I want to know if it's possible to have a push button so that when it's activated, it turns on my 9 volts circuit for 10 minutes and then turn it off. Also, I don't want this circuit to consume ...
3
votes
3answers
294 views

Software delay vs hardware timers [closed]

Working with a microcontroller, on which exact conditions should we choose between Hardware timers and Software delays on an Embedded Controller? I have seen articles which do emphasize on use of ...
1
vote
0answers
48 views

Hold switch trigger delayed

I have a small battery driven, microchip controlled project where I use a rotary encoder for toggling/setting various settings. Mostly software based as that is what I'm more familiar with as of yet. ...
1
vote
2answers
67 views

Variable delay element [closed]

This code if compiled has an error appear with (k) symbol. I need to implement this simple block. k (that represents the amount of delay) will come to my block from the previous block. ...
2
votes
1answer
45 views

Understanding max and min propagation delay in flip-flops

I've been working my way through Digital Design and Computer Architecture, but am very confused by the equations for time delay - what each of the variables are, and how to conceptualize these ...
2
votes
2answers
73 views

How to trigger reset at long press of button

I am trying to make a button control on/off and reset all in one, but I can't quite get my head around how to design it. It should basically function like a PC power button. If short press it's ...
1
vote
0answers
40 views

CTMU Time Delay Measurement Not Working - PIC24F16KA302

I'm trying to use the CTMU unit in a PIC24F16KA302 in an impedance measuring system. I'm applying a sinusoidal signal to a component and creating a voltage and current signal which I can then use to ...
-1
votes
2answers
185 views

Arduino-Arduino RF Communication, key needs to be pressed several times

I'm communicating two Arduino i.e. Arduio UNO as sender & Arduino Mega as receiver via RF-433 MHz transiver module. Communication is sort of working but there is one problem. If I want to send a ...
4
votes
2answers
303 views

Signal LED delay mini-circuit

In making a breakout board for an SMD Bluetooth module, I realized that simply wiring LEDs to your signal lines is insufficient for a decent visual indication, as signal duration is too short to be ...
2
votes
1answer
99 views

How can I simulate contamination delay in VHDL?

Propagation delay is simple to implement: Out <= '1' after 3ns; I tried to add contamination delay as such: ...
1
vote
1answer
98 views

Transistor as a mute switch, odd rise and fall times?

I need to mute (soft mute, no clicks and pops) an audio signal while routing it using a mechanical relay. I use a 2N5089 high gain NPN with a grounded emitter, collector to the signal output and the ...
0
votes
1answer
39 views

protecting a sensor component from high spikes when switching power on

I have an electrical scooter which has a "Hall Effect Sensor" in the handle-bar, measuring the magnetic flux to determine the amount of "gas" or gauge. This sensor tends to burn out quite frequently. ...
0
votes
0answers
58 views

Simple doorbell delay (add-on)

We have a new office doorbell with a pushbutton that rings a buzzer for as long as the button is held down (i.e. a simple circuit that is closed by the button). The buzzer sound is really "angry", and ...
0
votes
4answers
125 views

In CMOS, can I assume the delay of a multiplexer is negligible compared to the delay of an inverter?

Let say I have a ring oscillator, and I modify the ring so that the output of an inverter is connected to an input of a 2-to-1 MUX, and the output of the MUX is connected to the input of the next ...
3
votes
3answers
101 views

Dealing with digital circuits and their associated switching speed?

When designing a digital one-minute counting circuit I came across a difficult problem. Basically, I designed the circuit to drive the (normally HIGH) clock of the 10s slot low if the 1s slot's ...
0
votes
1answer
71 views

How to measure the delay of one single inverter in ASIC?

In practice, is it feasible for a chip manufacture to reliably and accurately measure the delay of one single inverter in ASIC? If it is, how can one go about doing it?
2
votes
1answer
226 views

Would shooting laser or UV light at an inverter make it permanently slower?

I'm studying the topic of cloning electronic circuits for my research. And I have a scenario as the following: Chip A has two ring oscillators (RO1a and RO2a). And RO1a is faster than RO2a. Chip B ...
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vote
2answers
2k views

STM32F4 (Discovery board) universal delay (milisecs) function

On the net, I have found following function for delay in miliseconds for STM32F4 (Discovery board MCU): ...
1
vote
2answers
217 views

How to find Gate Delay

I need to find the delay of a full adder. I searched for it but I couldnt find absolute information. Sample delays : XOR - 8ns / AND - 2ns / OR - 2ns What is the delay of this circuit? My Solution ...
-1
votes
1answer
85 views

MOSFET Delay Provider [closed]

I have this circuit, where i wish to turn lower one to ON after a delay, so that at one time only one of them is ON. The input wave is a PWM Square Wave. Can anyone suggest how i can do so?
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vote
4answers
928 views

Delay function in ARM programming

I have just started programming on ARM, I had some experience on AVR but not that much. The question is probably too trivial but the material about ARM is too little on the net... sorry anyways. I ...
0
votes
0answers
92 views

Effects of Non-Linear Phase Shift/Delay in ADC

I am designing a monochrome image broadcast system that involves: Camera -> DAC -> Frequency Shift Keying (FSK Modulation)-> Broadcast over FM ----- Receiving & Demodulation -> ADC -> PC Image ...
0
votes
1answer
321 views

How would I delay a power on and power off

I need to delay power to the motors for my CNC driver project (using Toshiba TB6560 ICs, which require the motor power to be switched on after logic power and switched off before logic power). I ...
1
vote
3answers
159 views

What's The fundamental difference between interrupts and delay in embedded programming?

I'm new in embedded programming in C, just getting to understand coding. Is there a fundamental difference between an interrupt function and a delay function? I would greatly appreciate answers with ...
0
votes
2answers
114 views

How does using Flip Flops between transmission links increase the maximum clock speed?

I am learning about things such as propagation delay and Transmission delays. About how they limit the maximum Clock speed in a given system (where all the chips use the same clock line). I can't ...
1
vote
2answers
81 views

Assignments with after and signals

I am trying to understand how assignments with 'after foo' work, so I read about the delay model and simulated the following code: ...
5
votes
4answers
2k views

Transistor Delay

I'm attempting to make an alarm for a freezer so that if the door gets left open, after 1 minute or so, an alarm will sound. I've got something similar to the schematic below. When the switch is ...
0
votes
1answer
302 views

Maximum and Minimum delay of combinational logic circuits

I am preparing for my exam and I am stuck with this past year question: In the circuit shown below, the blocks A, B, C, and S are combination logic circuits. FF1 to FF3 are D flip-flops with same ...
1
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1answer
74 views

Power delay profile and broadband bus

I came across the following solved question, but I have trouble understanding part of the solution. If anyone could shed some light into this I would be really grateful since this problem has been ...
0
votes
1answer
82 views

Do I have to equate clock and Data Bus propagation delay for Transmission Lines?

My question is about SDRAM timings for clock and DataBUS. Som designer advice that clock pin has to be the shortest one. Data Bus may be longer than these because of the some problems. But clock trace ...
2
votes
3answers
199 views

how to create a square wave with large duration and high duty cycle

For a "plant waterer circuit" I would like to add a safety feature that prevents watering for over ~3 minutes, and delays the next watering from occurring for ~12 hours. Currently the circuit is ...
2
votes
1answer
50 views

Large range delay at medium frequency for MC

I have a program that varies the step time and duty cycle for a 6 step commutation sequence. It takes an 8-bit ADC result and stores it as the TMR0 value, when TMR0 overflows, the ISR selects the ...
-3
votes
3answers
282 views

Drawing circuit activity through a D flip-flop while ignoring propagation delay

Can someone explain how would would draw the Y and Z activity in the following problem (if we ignore propagation delay and assume Y and Z start at 0)? How do the clock and X help in this problem? ...
5
votes
3answers
3k views

0-10 second on-time with a potentiometer

I would like to make a simple circuit, where the a potentiometer controls a 0 - 10 second on-time. If the potentiometer is set to min, the on time should be 0 seconds. If the potentiometer is maxed ...
1
vote
1answer
450 views

Generate DC pulse after switch turned off?

I've got a power source (say 12V DC) that I'm monitoring with a relay. I want to send a pulse (over 5V DC) to another relay for 60 seconds after the first power source has been turned off. A ...
3
votes
2answers
607 views

avr attiny84: wrong delay

I'm pretty new to avr programming. I'm facing a strange problem that I can't solve so far. I've wrote a simple code: ...
2
votes
2answers
129 views

Delay then off for tone signal

I have a simple circuit using a 555 timer as an oscillator to output a 12v tone to an intercom system. I'd like to make a delay circuit that will turn off the output of my circuit after a delay. ...
0
votes
2answers
236 views

Encoding delay of Ethernet and the relation to cable frequency rating

I asked a question here called "Speed of electricity (signal propagation?) through copper for communications delay". I wanted to know how long does it take a signal to travel down a length of Cat5e ...
5
votes
1answer
2k views

How to control Arduino frequency?

I'm porting a code from c in the Arduino platform (I'm using an Arduino Leonardo). I wanto to remote control a camera with an IR LED. The info about the remote control want to emulate here. The code, ...
1
vote
1answer
306 views

time delay circuit keeping line high

I'd like to create a simple circuit for keeping a line "high" for a few seconds after being triggered high, without any external power. To specify it in more detail: given three inputs, 3.3V, GND and ...
4
votes
2answers
382 views

Delay in Combinational Logic Circuits/Stability

What does it mean for an output signal to be stable? Is my understanding correct that when an input to a logic circuit changes, the time delay for the signal to reach the output (the time for the ...
1
vote
1answer
1k views

Speed of electricity (signal propagation?) through copper for communications delay

I would like to be be able to calculate the delay for communications data within TCP/IP networking through cat5e networking cable. That is a pretty vague ...
1
vote
0answers
87 views

Calculating delay caused by the voltage translator chip GTL2000/NVT2000

I want to interface a 5V DSP to a 3.3V FPGA so I need to use voltage/Logic translators for the data, address and control buses. I found this translator: GTL2000 , It's available in a 22-bit package ...
1
vote
1answer
182 views

phase wrapping group delay

I have the measurements of the group delay of a filter and the period of the signal is always smaller than the delay introduced and thus phase (frequency) wrapping is also introduced. Do you know any ...
2
votes
3answers
2k views

Bipolar stepper motor: What should the sequence timing be?

What I mean is, how long should a coil be energized before it's de-energized. Also how long should the coil stay de-energized before I power it in the reverse direction. Where can I find this timing ...
-5
votes
1answer
557 views

Smallest Delay Possible in a RF Remote Control

I have a very basic knowledge on electronics but that's it. so I don't know this topic well. Altho, I'm able to assembly a circuit , check it and make it work. I've been searching for info about RF ...
3
votes
1answer
279 views

Power Off Delay circuit

I'm looking for a timer that starts when power is removed. Here is the use case: The head light on dirt bike my turns off with the engine. This good when it's parked. This is very bad when doing ...
0
votes
1answer
736 views

How to drive the output pin on FPGA with small delay?

I have an FPGA board with two Virtex-2Pro FPGAs on it. I try to send data from FPGA1 to FPGA2 and then send it back from FPGA2 to FPGA1. I use a register (always block in verilog) to drive each of out ...
2
votes
1answer
751 views

MOSFET voltage controlled delay

As part of a project, I need to evaluate a clock distribution system involving transmission lines. As part of the system, we need to design a voltage controlled delay element consisting of a CMOS ...
1
vote
3answers
471 views

How does CPLD propagation delay work?

My question is about CPLDs in general, but take for example this cheap Xilinx one. I understand that unlike a microcontroller, a CPLD does not have a clock; external edges activate the logic ...