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27 Threads found on edaboard.com: 555 Time Delay
There is a way to start a timing cycle automatically as the 555 is powered up. Is this what you want to do? Or is your question about removing multiple bounces from a switch press?
You could use two time-delay relays. No soldering, but lots of money. Now might be a good time to learn to solder! I would look at using a 555 timer and a couple of transistors. They are cheap and plentiful. But if you REALLY don't want to solder, you could use a breadboard.
Hi, I have a little problem with a 555 circuit, here is the schematic 111925 in fact the problem is simple, when I do a short press on the switch, the relay remains activated during desired delay, by cons if I press longer on the switch, longer than the time delay, the relay shut off as soon as I release
A 555 timer IC is an easy and common way to do what you are describing. Below is a method which is more or less When the input goes high, the capacitor begins to charge. After a second it reaches about 1.
1 second is not a "little" delay; that's a BIG delay. I would suggest you use an inexpensive timer (555 or similar) to get your time function. You might be able to use a MOSFET with an RC in place of your BJT, but I think there is just too much leakage in a BJT to use an RC to get the long (...)
See this circuit maybe you will find something usefull for you : Three Stage - Cycling timer Circuit Stage time delay Circuit
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 (...)
G'day Mate, Bit tricky using passive components only! but depending on how accurate you need the 5 seconds a 555 timer should give reasonable results... remember to use an extended temp range part for automotive use... Follow the design of the mono-stable configuration as shown here... h
See LM555 timer Circuits the "2 stage time delay circuit" for the basis of a timer I would use in your application, where you need to set an accurate delay time for catching water drops.
Hi, Welcome to the Wacky World of Electronics! My first thought is that you might have some problems getting this to work reliably with just a 555 as your time reference. First of all, it's very difficult to get accurate time delays of the length you need (9 hours). Over time everything will drift and (...)
i asked the tutor he said its the delay of the 555timer and flip-flop. that caused the phase shift between flip-flop output and comparator output. Doesn't sound reasonable. 4027 and 555 have delays in < 1us range, even the comparator response time is much faster than the (...)
you can use 74121 for that purpose 74121 or 555 timer as a One-Shot
Hi, On time of 555 timer is given by Ton = 1.1R2*C1. Hence selecting values for R2 = 1.2k and C1 = .47uf, gives 620.4uS. Other combinations you may try R2 = 5.6k, C2 = .1uf gives 616uS R2 = 2.7k, C2 = .22uf gives 653.4uS. Hope this helps...
Cheers...... For a cheap timer circuit, the 555 is the best option. But the circuit's efficiency will be poor if u designed it for long time delays. Because, the timer capacitance leakage is the problem. It is better for time delay's up to few minutes. U Should connect the (...)
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 (...)
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 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...)?
Hi, In the net, you can search the 555 timer tutorial of Tony van Roon. It is clearly mentioned there and you can be clear about 555 timer. Thanks.
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 (...)
I think you can use a 555 with a relay.
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
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.
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 (...)
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.
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
for this you have to connect it with the ldr tha a delay circuit and then a 555 timer it will gives you more accurate idea how the circuit hsould work
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.