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60 Threads found on edaboard.com: 555 Time Delay
Do you need to do it with flip-flops? Can you use a one-shot? A simple 555 circuit can do the trick for you.
Hi guys,is there anyway I could get time delay using D Flip flops?I've tried googling it but all I get is info. on 555 IC timers. What sort of time delay do you want (1mS, 1 min...)?
I find the make monostable time delay IC. What kind of IC exist? (except lm555 IC) Thanks.
See this circuit maybe you will find something usefull for you : Three Stage - Cycling timer Circuit Stage time delay Circuit
You can use a transistor in series with the motor and put a RC circuit on the base. Or you can use a cmos 555 timer in the one shot (monostable) mode and an AND gate which will drive the transistor base.
I need to build a simple delay off timer. When the input is triggered (pulse only) the output must go high and stay high for a period of say 1 hour or 4 hours or selectable. When the input is triggered again, the output timing is restarted. Any idea's? Would a 555 timer work? Not sure about the long (...)
555s can be very fickle when used in timer mode, they are very prone to false triggering when near any source of interference. I think you will end up tearing your hair out when used in the presence of an electrically noisy motor. You can buy timed off relays with variable timers. Also as Banjo suggested, a cheap micro (...)
You may want to describe the intended circuit operation more clearly. To my opinion it's hard to understand either from the circuits or your description. Generally, introducing a delay in the said range involves capacitors of about 1000 uF. It can be implemented more easily with active parts, either timer circuits with 555 or transistors (...)
You really need to post your schematic. No one is going to know the exact Maplin circuit you "robbed". Take a look at: This is the basic 555 monostable circuit. One problem is charge stuck in C1. If you close the switch for several seconds, open the switch and then close it again quick
Hi guys i need a timer relay for my car. I already browse the forum but still confused. I need a 555 based power-on and power-off time delay relay(separated circuit). The time must be adjustable and i need a regulated power supply for the circuit. I also need to know how to calculate the timing of (...)
There used to be an 8 pin IC for automotive use, that had capability from 3.7 secs to many hours, it had a built in ripple counter so that timing components could be small and more accurate. I really cannot now remember the part number, which is a pity, as they were very reliable in noisey enviroments. You may be able to find something similar, oth
I wouldnt use any of those for your application. You want a loud buzzer, well you can get a cheap piezo that'll produce 100db's, which is annoyingly loud, getting that from your own circuit requires complexity. I'd use the above piezo on a monostable to give the time delay. A standard monostable 555 circuit would work fine, you'd (...)
Hi, I'd like to design a circuit such that at first, the circuit is completely powered off. The user pushes a switch, which injects power into the circuit. Then a mechanism maintains the power active, even if the switch has been released. At a later about 3 seconds, when the circuit does no longer need power, it cuts its own power and sleeps u
I need to know if the 555 is using any power at all while waiting for the button to be pushed. A standard bipolar 555 has a rather large supply current of several mA, CMOS 555 still up to several 100 uA. Refer to the data sheets for details. So you would want to disconnect the power supply in idle state or use a RC + CMOS monostabl
Hey,Man who can help me to design a circuit which will activate a relay after 45 minutes during 10 s,I don`t want to use PIC or an other microcontroller type. I would like to use logic circuits like cd4060,monostable like ne 555 and so on-- Any suggestion is welcome!!
I wouldn't use 555, instead consider (also 8-pin-DIP) PICAXE-08. delay can be set by programming this IC (command WAIT 60 => 60s delay), there is no problem in triggering it on power-on, and input can read transitions from 0-to-1 and from 1-to-0 .. Cost - $1. And the most important thing is that there is no dependence on any external (...)
From what you describe you need two stages of timers. 1: delay after initial sound begins (or ends?) 2: 'on' time for activating equipment It may be easiest to use a second 555 IC. There's the 556 which contains two 555 in one package. Otherwise if you are willing to experiment, you can use a (...)
Good point! Sorry for being so unclear. The fan is mains (220V) operated, and the toggle switch is part of the mains power, switching the lights on-off. The delay off electronics is 12 V operated, and gets its power from the permanent phase and zero lines. The coupling between the low V and the high V circuits is made with relays. The referred to
Hi, I need a timer that after applied 127VAC/60Hz it counts let's say 20 seconds and then turn on a relay and stays on, using a transformerless power supply and a LM555 timer. Regards, Fernando
If you can put your circuitry inside the amplifier box, you can use a 555 timer to make the time delay for the relay closing. For the resistor, just put it from the capacitor output to ground.
how could i use the 555 timer to delay the coming signal for specific amoint of time i mean i need a circuit that will alarm 2 minutes after the darkness is detected
use a TSOP 1738 receiver which operates at 38jHz search d net for datasheets......very easy to use and for d transmitter u can use IR LEDs u can generate 38kHz freq using 555 timer as astable multivibrator or retriggerable monoshot having small time delay use bursts of these 38kHz freq signals aimed at d TSOP 1738 sensor.
I need a timing circuit with the said output below. You may say this is an ordinary monostable circuit. But this is probably not, the circuit will only change its output after a certain period of time after the user triggers the circuit. Another difference is that the output is dependent on the users trigger, after the trigger is released (OFF)
i have uploaded a corected version to so check it out. The idea is that you calculate the time on for the 555 timer i added to the time it takes to scan through the LED sequence and the time off to be the delay u want. If
You can use a 555 timer to implement the delay. In the astable circuit, disconnect the DISCH pin, and make sure your button shorts the timing cap to ground when not pressed. Once you press the button, it should open its contact and the timing cycle will begin. Once the time has expired, the output will turn on and stay on (...)
Ken, I wonder if it can be done with a two 555's wired as monostable??
I think it?s a perfect job for something like the PICAXE-08 .. Cutting story short, it?a 8-pin PIC based microcontroller with BASIC interpreter .. Almost no external components are required, and if you stuff it up for the first time ? just change the code .. Look, mate, the 555 is still good but in applications that require a little bit of ?in
Yes, it is possible, but you need more than one 555. Can you describe the application a little better?
Hi Wondering how i might have diff. delays by using 2 diff. size resistors in my RC. I know you can have 2 together in series but i was thinking of having one to provide a very short delay whenever the board starts up due to a power change, and another one that would occur whenever the restart was due to a reset button that pulls pin2 low on the
I think you can use a 555 with a relay.
Power-on delay can be realized in several ways, for example with the very popular 555-timer, but I would like to encourage you to use a small microcontroller, some times called the 555 of the new millennium, namely the PICAXE08 .. You shouldn’t have problems in buying it in Australia (Altronics) ..
For jobs like that you may consider PICAXE08 .. Some times it is called the new millennium 555 .. Not only you don’t need to worry about R or C, and triggering the 555-timer on power-on can cause some problems .. Nothing like that with PICAXE, if you need to change time, or delay, (...)
Hi, Right now I'm given a small project by my lecturer to do a vco from 555 timer. The centre frequency of the VCO is 10 kHz. I've already read the application note of the 555 timer and tried to simulated it with pspice. There are 2 problems occur when I try to simulate it: 1) There is a delay in output (...)
You can use a 555 timer in a monostable mode to get the desired effect. Check out this page, under monostable, and using the circuit modification mentioned in "Power-on reset or trigger" (cap in parallel with power switch) 555 timer circuits The basics of why this works is detail
Hi all I want to add a timer circuit to a led flashlight so after I press the 'on' switch it will shut off after a few minutes automatically 1. It has to be small 2. it works on 3 AAA cells possibly nimh so v~1.2*3=3.6V 3. no drainage during the many many hours when the light is off (either main switch off or timer switch off) so i don't d
555 can be used as a 50% Duty cycle Generator, Astable Mutivibrator, Monostable Multivibrator and also Bistable Multivibrator.. Don't confuse with time and Frequency.. Frequency is nothing but Frequency = 1 / time... If your pulses need 50% duty cycle means then the formula for choosing Resistor and Capacitor value as per your frequency (...)
hi everyone i am building a simple DC-AC inverter for my school project, i am stucked at how to use a 555 timer to generate control signals to control two MOSFET, which will output ON/OFF/OFF to one MOSFET and OFF/OFF/ON to the other MOSFET, is there a simple logic circuit to do the job? ideas? thanks
Hi All Frist: I'am new to this forum and know a little about electronics. I''m also thirteen. I searched the forum for a similar project.Before posting here.But? Could not find any thing to what i need. I build a astable 555 timer for clocking the time period of 10s appox five secs (On) five secs (Off). Just to learn how the (...)
Hi I am using an TLC555C chip from Texas instrument to form a monostable timing circuit (see attachment). When simulated this circuit gives a delay of approximately 17s, in real tests using a 10uF ceramic capacitor the delay is approximately 12s and 18s with a 10uF aluminium electrolytic capacitor. Have anyone else experience that the (...)
Maybe you need to have a timer and delay using a LM555+CD4017 70183 johnson counter for your 6sec delay ?
Hi! I'm trying to design a digital weighing scale that would open a certain port when a certain weight is present as input. However, the weight ranges are too close to each other and gives an equivalent ADC output of like 10.111 and 10.555.. how do i consider the numbers after the decimal point to be read by the analog to digital converter. Please
Yes it is possible, altough your 120 seconds won't be extremely accurate. You can expect to end up with about +-10% tolerance on your timing.
Hi guys. I'm new here so a little back'ground. I'm an automotive mechanic with a background in automotive electronics. that being said I'm working on a project and while I do work on automotive components this goes a little deeper than I ever need to go. I need a component that I can momentarily trigger to energize a relay for 5 seconds. I hav
A 555 timer IC might do the job. It's one of the most popular and easy-to-use chips. You would arrange it to trigger when it detects a drop in volt level. The output goes high for 15 seconds, whether the switch is closed again quickly, or remains open. The length of time delay is set by the 150 kOhm resistor and 100 (...)
For a first guess, have a look at 555 timer application notes. If you want zero current consumption in off-state, a different approach might be required, e.g. using CMOS logic ICs or transistors.
Do you mean you need a delayed starter? You could use a 555 timer and connect it's output to a transistor to power your LC circuit.
Hello, Could any one provide me with code for detecting a pulse stream such as that from a 555 timer in astable mode. Here is something I came up with. A circuit attached to RA0 and RA1 detects movement. If there is no movement the is a stream of pulses at RA0 and RA1. If there is movement, the pulse stream stops. It measures the time (...)
Single capacitors quite often don't work well as delay circuits .. Maybe you should consider the very popular 555 timer .. something similar to this: Regards, IanP
use 555 as ramp generator, see datasheet NE 555
Using 555 wil be the best option as far as i know.. If u want to develop it from transistors,then build multivibrators(astable or monostable as you wish..) Refer some circuits through google search.. Using comparator is another option,but 555 is the best if u want to change the duty cycle.. 555 is very flexible ic..