113 Threads found on edaboard.com: 555 And Timer And Design
On 2001-09-17 08:54, Robin Hood wrote:
This free 555 timer design program provides for four operation modes (3 astable, 1 monostable), plus 16 application examples, and timer/component specifications.
File size: 253KB
Thanks for sharing
Professional Hardware and Electronics Design :: 26.02.2002 23:13 :: just_one69 :: Replies: 10 :: Views: 4007
555 is not designed for this application.
All what you need is a microcontroller controlled real time clock ..
Electronic Elementary Questions :: 01.03.2005 06:59 :: IanP :: Replies: 2 :: Views: 692
For 1), you can use two 555. The first one as a monostable and the second one as an astable. The astable period be the blinking period of the LED diode. The monostable period should be 5 second. The monostable output (3) should be connected to the reset pin (4) of the astable.
Electronic Elementary Questions :: 18.10.2004 07:17 :: papyaki :: Replies: 7 :: Views: 1691
I would like to modify a timer's design I have built, but do not have electronics workbench any more sad.gif
I do not know that much about electronics, I've built a few velleman kits, made radio's as a kid. Kinda basic working knowledge.but with gaps. When I was at uni part of the computer course involved using Electronics workbench. T
Hobby Circuits and Small Projects Problems :: 27.02.2005 08:15 :: cliffclivin :: Replies: 0 :: Views: 971
Couldn't open the schematic. Anyway the design have been used before and also there is a version that use a 555 timer and diferent RC constants for each key. Micro use a timer for frequency measuring instead of ADC port. But there is a problem in both (...)
Microcontrollers :: 12.05.2005 07:41 :: marie65 :: Replies: 6 :: Views: 705
Im using the AM Transmitter and Receiver Pair along with the RF600 enoder and decoder.
I have constructed my PCB, the output is going to a 555 timer with a basic pair of LEDs and a buzzer.
At the moment when I press the learn switch the status LED on the (...)
RF, Microwave, Antennas and Optics :: 02.10.2005 14:06 :: mhamini :: Replies: 0 :: Views: 461
Anyone has the papers or circuits about
741 operational amplifier
431 voltage reference ?
Thans in advance!
Analog IC Design and Layout :: 19.09.2007 02:33 :: dongqing :: Replies: 1 :: Views: 529
I am trying to build an LED chaser using 4017 decade counters and a 555 timer chip. My design is based on that from this website, with a few changes:
Instead of using 9 LED's, I wanted to use 12, which required a third 4017. I basically daisy chained it into the loop, so that now IC
Hobby Circuits and Small Projects Problems :: 07.04.2009 03:06 :: jar1087 :: Replies: 0 :: Views: 1412
Hello, I actually just designed a small buck converter myself (12v -> 5v). The design was pretty simple, 555 timer and P-Channel/N-Channel mosfets to a homemade torroid. I calculated my efficiency to be about the same as yours.
I don't understand what (...)
Electronic Elementary Questions :: 05.02.2010 14:13 :: gs611 :: Replies: 4 :: Views: 2879
this link could prove to be another revolution.
Electronic Elementary Questions :: 16.04.2010 00:43 :: cameo_2007 :: Replies: 4 :: Views: 1271
This page has the equations and a calculator
Also check 555 and 556 timer Circuits
Electronic Elementary Questions :: 05.05.2011 13:52 :: alexan_e :: Replies: 9 :: Views: 3782
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 (...)
Analog Circuit Design :: 20.05.2011 02:00 :: purpleanger :: Replies: 6 :: Views: 940
Any solid reason is there for choosing 4060 IC as an 3second monostable circuit. The same can be easily achived with 555 timer.
Analog Circuit Design :: 12.06.2011 12:57 :: vinoth8051 :: Replies: 1 :: Views: 1261
Use a simple 555 circuit- ASTABLE OSCILLATOR CALCULATOR
R1=120k, R2=68k and C=220uF Theoretically results t1=29s/t=10s :grin:
LM555 timer Circuits
Analog Circuit Design :: 07.07.2011 04:51 :: mister_rf :: Replies: 1 :: Views: 1091
can anyone explain the relationship between control voltage and pwm output of a 555 timer.
searched a lot but could not get one.
Analog Circuit Design :: 26.07.2011 03:28 :: kishore3677 :: Replies: 26 :: Views: 5432
Google "555 astable multivibrator" and look at a few of the websites you get back. There are MANY that talk about how the circuit works... all the way down to the nitty-gritty details about the level comparisons and current mirrors inside the 555 IC.
Analog Circuit Design :: 26.09.2011 23:41 :: enjunear :: Replies: 4 :: Views: 1070
I have to design a flyback smps of o/p power 3W.
I want to use 555 timer as PWM oscillator and control the duty cycle from 0 to 50% using control voltage.
1. In what configuration 555 timer will be configured, whether astable or monostable mode
2. How can i (...)
Power Electronics :: 25.10.2011 08:28 :: saurav_sdpl :: Replies: 9 :: Views: 10880
The formula is:
T = 1.1 * Ra * C
C could be 470uF or 220uF in your case.
I already used 555 for such long time to control my 3 refrigerators so that they start one after another when mains voltage returns after cut-off.
PS: The leakeage current of C will affect the time, by making it longer. But if it is relatively high then time w
Analog Circuit Design :: 09.11.2011 11:33 :: KerimF :: Replies: 4 :: Views: 821
This is my voltage stabalizer that I found in one of those old analogue electronics book. Need it for my project and had built it but it didn't work
I also need to use a h-bridge to convert my DC battery to AC sinewave. The circuit used is shown below
I cant seem to get both of em' workin
Power Electronics :: 09.02.2012 14:58 :: psyduck :: Replies: 2 :: Views: 1148
There are also many on line calculators, they can do the job but I'm not sure if you will learn anything.
Analog Circuit Design :: 01.05.2012 12:51 :: alexan_e :: Replies: 3 :: Views: 767
these two componets are also used to design filters.
capacitors are also used for dc battery stability (to eliminatea/c flutuations).
caps are used for timing (by charging and discharging through resistors) in 555 timer circuits.
Electronic Elementary Questions :: 02.05.2012 01:09 :: shahbaz.ele :: Replies: 4 :: Views: 2045
im using Agilent ADS 2009. how to create a 555 timer? please help. im a newbie in this software.
RF, Microwave, Antennas and Optics :: 14.06.2012 11:09 :: whycanot323 :: Replies: 5 :: Views: 1000
The 555 timer IC can be used to do what you want.
Example hits using an internet search:
The concept is also known as a voltage controlled oscillator (VCO).
There's the question of linear response. Do yo
Power Electronics :: 19.08.2012 18:25 :: BradtheRad :: Replies: 1 :: Views: 342
a 150W switchmode power supply with 555 timer:
it cheapest method to design such switch mode power supply.
Analog Circuit Design :: 24.05.2004 01:32 :: alphi :: Replies: 14 :: Views: 18079
I have a 555 timer in monostable mode. When the 555's output is active, it drives a transistor which drive a dpdt relay which drive a motor.
I need to know how to make a circuit that can detect when motor the stop because of a jam. Since the 555 has a reset pin, a circuit that sends a logic 1 to the reset pin when the (...)
Hobby Circuits and Small Projects Problems :: 26.06.2004 18:56 :: solvarg :: Replies: 3 :: Views: 1056
Here are two 555 design programs.
Analog IC Design and Layout :: 03.07.2004 18:50 :: flatulent :: Replies: 4 :: Views: 1384
u can try PWM with 555 timer? :)
Electronic Elementary Questions :: 12.09.2004 13:35 :: zkai2000 :: Replies: 2 :: Views: 4191
What frequency / range are you looking for on output ?
555 is simple and crude, assuming a linear input, but if you say used a PIC or AVR with A/D on board, you could program the O/P on an I/O pin and code define the tables yourself and compensate for any adjustments on (...)
Professional Hardware and Electronics Design :: 28.11.2004 18:27 :: Frosty :: Replies: 2 :: Views: 3660
Well my idea is a bit different. I would use PC sound card for it. If 555 timer is used as voltage controlled oscillator then the pulse width of the output waveform can be detected using some programming. I haven't implemented it yet but may be a precise solution.
PC Programming and Interfacing :: 23.02.2005 00:45 :: nvd :: Replies: 6 :: Views: 6640
Your diagram looks fine, but I have a question:
Why don't you use 3 x 555 (adjustable time from 1 to ..10s) and connect them in a sequence ie. one triggs the next one, the last one triggs the first one... ?
On power on you will need to trigg the first one and the whole sequence will run ..
Hobby Circuits and Small Projects Problems :: 28.02.2005 00:02 :: IanP :: Replies: 4 :: Views: 1250
you can use the 555 timer from national semiconductor. in their datasheet, they have a oscillator wired the output isn't nice, you can put it through a inverter to get a cleaner square wave.
Analog Circuit Design :: 23.03.2005 00:22 :: wwfieee :: Replies: 4 :: Views: 3675
Be carfull when planing long timming periods from a 555 timer . The circuit shown relies on a 1000uf capacitor. This is a component with a high leakage current and I would recomend a tantalum capacitor or a none electrolitic equivelent. Even so it may appear to work when first constructed but may well change duo to ageing (...)
Analog Circuit Design :: 06.05.2005 06:36 :: barrybear :: Replies: 10 :: Views: 1764
You can use 555 timer in monostabile configuration to generate 1ms impulse. This impulse (reversed) can control P-Channel power mosfet or PNP BJT transistor.
If you sue battery as the supply source you don't need additional capacitor; battery easily should be able to deliver 400mA over 1ms..
Analog Circuit Design :: 22.06.2005 01:39 :: IanP :: Replies: 2 :: Views: 700
Firstly, take a look at the low-power C-mos version of the 555 astabile timer:
Secondly, go to this site:
Basically a 555 works as follows:
When the voltage on pin 2 is less than 1/3 of the IC's supply voltage (Vcc), the RS FF is set and the out
Analog Circuit Design :: 12.09.2005 02:02 :: IanP :: Replies: 2 :: Views: 1960
You can use a 555 timer configured as a one-shot. See its datashet for examples and calculations. You do not need to use the trigger input in your case.
Hobby Circuits and Small Projects Problems :: 17.11.2006 12:32 :: VVV :: Replies: 3 :: Views: 1917
That is wery simply to make seconds indication. You connect 2 7447 and 2 LED display to U11 and U12 like displays of minutes. timer 555 is not stable. You must use piezo cristall for frequency generator.
Electronic Elementary Questions :: 31.12.2006 17:06 :: Jan Iwaniuk :: Replies: 4 :: Views: 2388
I dont mind doing my own research but right now I am not sure what i am even looking for. What I need to do is send a high/low signal (from a sensor) to a board with a 555 timer to stop the clock (stopwatch). I dont know where to start I would think it would be relativaly simple to just send a 1 or 0 compared to audio modulation (...)
RF, Microwave, Antennas and Optics :: 19.02.2007 17:52 :: Karkov :: Replies: 1 :: Views: 628
i want to design a timer having ON period=30 seconds to 1.5 minutes variable......and OFF period also variable from 2 minutes to 5 minutes........
I hope one can do using 555, but how to do ...plz advise me....
u tell me for 45 seconds ON and 4 minutes (...)
Electronic Elementary Questions :: 10.05.2007 09:48 :: jsps :: Replies: 1 :: Views: 1051
The functional blocks in your picture are all single chip implementations. You need a 8 to 1 mux/encoder, a 3 to 8 demux/decoder, a binary counter, a 555 timer to generate the clock and a bunch of diodes and resistors to connect the seven segment display to the output of the (...)
Microcontrollers :: 19.05.2007 18:40 :: jonw0224 :: Replies: 5 :: Views: 1041
I'm designing a circuit that uses a 555 timer that has a vddmax of 18v. Is it ok to input 12V from a car to run this circuit or should I get a voltage regulator?
Hobby Circuits and Small Projects Problems :: 27.05.2007 02:04 :: david90 :: Replies: 5 :: Views: 1812
I search around NET and found that IC555 can work as Asymmetric timer.
I would like to control 220v FAN power on 60 mins. then Off 30 mins. and so on in periodic until I unplug them.
I think the last circuit (the one that have diode) is best suit for me.
Tm = 0.7 × R1 × C1
Ts = (...)
Analog Circuit Design :: 29.06.2007 20:42 :: tong :: Replies: 9 :: Views: 2158
use 555 timer circuit to feed the buzzer
also 8051 can work well for you
Electronic Elementary Questions :: 08.11.2007 01:17 :: abaidullah :: Replies: 3 :: Views: 1207
You will need two timers to do it: one that gives you the motor on time, 1s, the other that gives you the interval. Two 555 timers or a 556 will do the trick.
Electronic Elementary Questions :: 26.05.2008 12:28 :: VVV :: Replies: 7 :: Views: 767
I originally posted this question in Analog design section, but I think it might be more appropriate to post here.
I'm using protel to do some simulations and in my circuit there is a ICM7555 cmos 555 timer. I downloaded a couple of spice model files for this module (most of (...)
PCB Routing Schematic Layout software and Simulation :: 22.05.2008 11:12 :: jerryjog :: Replies: 0 :: Views: 1342
Just use a mosfet to switch a load in and out. Like on full load Fet off no load .
If you don't have a function generator just use a 555 timer and a driver,for the mosfet.
Analog Circuit Design :: 25.08.2008 22:33 :: max0412 :: Replies: 11 :: Views: 2268
Hi I hope someone can assist me with a small design question regarding a 555 timer IC.
Can a 555 ic be operated using a negative power supply? with the the usual positive voltage connected to ground?
I was given a circuit to power a 555 ic using a -5v connected to pin 1 (...)
Analog Circuit Design :: 10.06.2009 04:59 :: kev241 :: Replies: 4 :: Views: 1961
I am using L297 and L298 to drive a unipolar stepper motor with 555 timer circuit which was connected to the Clock Pin in the L297 chip
First I connected the L297
I connected SYNC, /RESET, CW//CCW, H/F, ENABLE to VCC and the freq out of 555 is 0.6 Hz to detect the (...)
Robotics and Automatics Forum :: 13.07.2009 17:11 :: ahmed_14 :: Replies: 1 :: Views: 2925
In Australia you can easily get hands on PICAXE-08 (looks the same as 555 – 8-pin DIP) ..
Altronics sells it for A$4.50 or you can get PICAXE-08 kit for A$35 ..
Programming software is free, all what you need is a serial port in your PC ..
555 is just a timer, whereas PICAXE can be programmed to (...)
Hobby Circuits and Small Projects Problems :: 24.07.2009 22:15 :: IanP :: Replies: 2 :: Views: 1633
It can be done in several ways, here is one example:
-Connect a diode between the reader and 12V-door ..
-design a timer (can be based on 555) which will be trigged by the falling edge of the 12V-signal from the reader ..
-Connect the output from timer (if you need more current you can (...)
Electronic Elementary Questions :: 13.11.2009 20:45 :: IanP :: Replies: 2 :: Views: 970
Why do you have to use a 555 timer?
You can buy a step down controller IC instead of using 555 timer.
EDA Jobs :: 22.12.2009 21:07 :: skowe26 :: Replies: 8 :: Views: 2239