Adding Keywords

Please advise on how to add an additional keyword to a published Instructable.  I have tried adding the keyword "555" or "555Timer" to my recently published Instructable "Electronic Paperweight" but keep getting an error message.  Editing the Instructable is no problem, but cannot add a new keyword.

Posted by TinkerJim 6 years ago


Whats a 555 and how does it work?

Posted by colmon9 11 years ago

555 timer

I need help to understand how a 555 timer works, but mostly how I could build one. or if some ones willing to make one for me, i'll buy it, but it needs to have a ways to control it. well talk if your interested. I need it for a gate control for my SCR induction furnes.

Posted by Danielro10 9 years ago

555 Timer Projects

Help me find projects using a 555 timer as many as possible. The hreater the better

Posted by e=mc^2 6 years ago

Pushbutton Servo Control with a 555

I've found numerous write-ups on getting a servo working with a 555 IC but it's not quite the functionality that I'm looking for. What I'm trying to do is have two buttons go to a predetermined position but the write-ups have two buttons that just go clockwise or counterclockwise. I know this can be done with an Arduino but I'm trying to avoid that route so I can keep the footprint as small as possible. I've attached a picture of the schematic I was working from.

Posted by XAlliedYouthX 4 years ago

Computer parts and others

I just basically saying 555 timers, lm386, boxs of wires, computer parts like HDs and mother boards, leds, resistors, capacitors, and other electronic componets.

Posted by Kante Tech 6 years ago

7805 and 555 timer circuit heat.

Hi all! I made a test led blink circuit with a 555 timer on a bread board. Just a basic two led blink circuit you can find all over the place. I used a 7805 for a supply regulator with power from a 9v batt. The circuit functioned fine (to my knowledge), but the 7805 got REALLY hot. I've used 7805 in opamp circuits with a 7.2v batt and no detectable heat. Is what I'm experiencing normal? Or do you believe something I did was wrong. If I remember correctly (I'm really tired as I write this) i was using 100nf caps on both ends. Thank you Nic

Posted by Mrlzeppelin 8 years ago

2 Position Servo Controller

I need some help, I am trying to create a damper control using a servo and a 555 timer. Is there anyway that you can use a 555 timer to make a servo move back and forth between 2 positions (0 degrees and 90 degrees) with an with and on/off signal and not a pot? So when the thermostat sends power, the damper moves to 90 degrees, then when the thermostat shuts off the servo returns to 0 degrees? Thanks for the help in advance. -Ryan

Posted by WingmanSVT 6 years ago

How to make a timed LED

Hello I need help. So I want to make like a bomb timer where there is a count down and then it triggers something. It doesn't have to have a display of the numbers just like I can set it for however many seconds, then push a button.  Thanks

Posted by HavocRC 5 years ago

Heartbeat Pulse+Speaker+555 timer

Hello all! I'm posting this idea that I have for making my wife a gift for our anniversary. I'm posting this in burning questions as my research time for this is rather limited as the whole project is to be a surprise. Here's what I aim to build... What I want to make is rather simple, I want to make a pulsating heartbeat sound through either a piezo speaker or just a small 2 inch or smaller speaker. The more compact the better as I plan to integrate this into the other half of my project. The problem is im not very familiar with the 555 timer, I normally don't use them in my projects as I try to work with AC most of the time. But that's another topic. So anyways, my idea is to set the duty cycle low so it's 3 quick pulses and then about a second of silence. I imagine programming in Arduino would be easier but therein lies the problem: I do not know how to program and every Arduino I have is fried. (I make good use out of my components!) This is when I turn to the community and sincerely ask for your help in making this possible. Someone who is more familiar and can quickly and conveniently answer this is obviously more then welcome! This is where I plan on getting most of my research done in my off time. Any help is greatly appreciated. If further explanation is needed please do not hesitate to ask. :-)

Posted by 49percentGood 5 years ago

Schematics, Help Please

Hello, I'm trying to create a simple timer that sets off a device after a set amount of time. I'm using a schematic from a basic electronics book that my grandfather had given me a few years ago. And it seems simple enough to the point where I can understand how it works. But I just can't seem to figure out how to actually put it down on a breadboard to even test it. So if you could possibly help me find out how to place this down on a breadboard to at least test, I thank you very very much. -The picture of the schematic should be below.

Posted by caseyweed 10 years ago

Auto restart circuit or software for external FireWire hard drives?

Hello community,  I own a few external hard drives, plugged in FireWire in the Mac, and for whatever reason, when left idle for a good length of time, they cannot spin back up, and it appears as if they crashed. Usually, I quickly power-cycle them, which seems enough to restart them but not unmount them. For the manufacturers, the drive don't have any defect as spin-down is the expected behaviour.  So currently, I was considering a crude circuit based on a 555 (I have about ten of them) or a 556 (just 1) that would automate this power-cycling, and would connect as a multiway switch. I found some long-delay repeat timer designs, but still unsure what form the final stage would be, considering up to 2A (probably more during startup) probably flow through the switch. I though about a reed relay, but they are difficult to find and quite bulky to be integrated in the external drive. The other delicate part is that the end-stage must not stay in the off state for more than about half a second, otherwise the hard drive will be unmounted The second main drive subject to this problem is more complicated, as it doesn't require any external power source but takes it from the FW port. Alternatively, I thought about a very simple (algorithmically speaking, because I know absolutely nothing there) script that would 1- detect when the drive is present. 2- When it is, every hour, delete and rewrite a small file to a partition, causing the hard drive to stay on. At least one software do that, but has an exorbitant cost of $12 to circumvent a flaw in the OS. Any idea, one way or the other?

Posted by Cubytus 4 years ago

555 oscillator?

How can I make a simple variable oscillator out of a 555 timer, loudspeaker, capacitors, transistor, potentiometer, and resistors? (and anything else I may need). I would ideally like it to go from about 10Hz-20KHz.

Posted by andy70707 7 years ago

'Sierra Wireless MP 555 GPS Modem

I have 4 NIB Sierra Wireless MP 555 GPS Modem for sale, see them on other auction sites for $100+ each, used, I'm selling all 4 for $250 or $75 each + shipping.

Posted by fzxdf5 8 years ago

Delay for a timed switch?

Hi, I wont explain my purposes(maybe in an instructible if i get a good answer) but I need a simple(as in, requiring very few parts) schematic for a 555 timer. I need a setup where i have a battery, connected to a switch(the kind that you push, and it closes the circuit, then you push again, and it opens the circuit. I forget what its called) that goes to a 555 set to delay for 10 seconds. After the 10 seconds is up, it allows the electricity to go through. Anyone understand? If needed, I can upload a pic of what I need.

Posted by metrogdor22 7 years ago

need help on 555 110v timer.

Hey guys w up? i`m asking for help, i`m trying to develop (i have one, similar) a 110 v timer based on the 555 (or any other) i have seen many timers on the web but they run on 9v batt and i do not have room for the transformer , can u help me ??? all (just nothing) all i need is the electronic diagram . i need the timer to work on 110v and run two different cycles a: 90 seconds b: 180 seconds and cut the power. (untill you press the push button again) i have an electric diagram. tx so much. if you need help w something (i`ll try to help you if i can) even if you can`t help me ..ask e have nothing to loose.

Posted by scopevisions 10 years ago

Need "Timer" help right away. Automotive 12VDC

I need a 12 vdc timer that will pass thru 12v once activated, BUT only for about 1 to 1.5 seconds. Then it has to stop passing the 12v even though it is still powered (12v is the still being supplied). Once the supply voltage is removed, it needs to reset so that it can pass thru again the next time supply voltage is introduced. I can solder & read. That is about my limit of electrical circuits. Would an IC 555 timer be able to do this somehow? Thanks STEVE.

Posted by st600r 2 years ago

What do you think of this circuit?

I made a few changes to a circuit, since it's the first time I do this I'd like to know what you think and if there's anything I should change.

Posted by pquadros 5 years ago

555 timer cicuit

Hello guys I have a minor problem, I built a 555 timer circuit and it runs off of 6v. My plan is to use a 9v battery. Will the project be OK or will I need to drop the voltage and how would I go about that? Would I connect a resistor to the positive of the battery then to my project's input? Thanks, 

Posted by HavocRC 5 years ago

Do I need to protect my 4024 if I'm using a 555 for the clock signal

If I am using a 555 timer IC in astable mode at a running speed of about 1hz at 9 volt and pin number 3 (output) will be connected to a CMOS 4000 serie counter, (MC14024BCP package), do I need a resistor on the output of the 555 to protect the 4024 or it's ok and the 4024 will draw exactly what it need for his input?

Posted by sxdemon 8 years ago

555 Timer Calculator

Hi everyone, I was looking around on the internet a while ago for a calculator for 555 timer circuits and couldn't find one that worked very well. Then I set about making my own in a Excel spreadsheet to calculate the frequency and duty cycle for me. I have decided to share it with everyone to help others. It is quite simple. Enter your vaules into the yellow boxes and get your frequency and/or duty cycle from the blue boxes.

Posted by qwertyboy 9 years ago

(4) flyback transformers for sale

I have four flyback transformers for sale, I have marked where the ground is for the HV on them. they are in a fine condition. I would like to get a few of them off the shelfs, they are taking up too much room. I want to get $20 for them and I will also ship them any where in the united states for free.

Posted by inductionheat! 8 years ago

Need help with this Led Flashing Circuit, 555 Timer

OK, The image bellow is what my circuit is looking like. Everything works fine, but I want to make it a dimming circuit instead of a flashing one. This is all being powered by a 9volt battery.

Posted by cris11368 8 years ago

555 timer help

Lets say I have one 555 timer and I wanted to have two LEDs blink at a different time each three seconds apart like this LED #1 Blink...1...2...3 LED #2 blink...1...2...3 LED #1 blink... how would I do that or is it even possible.

Posted by iman 11 years ago

41 LED Flasher Circuit using 555 IC

Ok I've managed to get the single LED working but not the rest what am I doing wrong ????????

Posted by TattooedJudge 2 years ago

Joule Thief w/ 555 timer

Hello, I have a question about using a 555 timer with a joule thief. I'm trying to build a circuit for some solar powered bike lights but I have a couple of questions... 1. Am I correct in assuming that it's a bad idea to try to run a TLC555 timer chip from the output of the joule thief? Without a load, it seemed to be pumping out at almost 80 volts. 2. I tried building the circuit so that the two rechargeable 1.2V batteries would power the 555 directly, and then the output would sink and source two transistors alternately, which in turn would switch the LEDs alternately, using the output from the joule thief, which was also powered directly from the battery. That resulted in no LEDs lit and some very hot transistors... Bad idea. The TLC555 chip is supposed to run on a supply voltage of 2-18V, but when I tested it with the 2.4V coming from the batteries, it would source, but not sink... Is there any way to build this circuit so the 555 could blink 2 LEDs alternately while the LEDs are powered by the joule thief? The only alternative I can see that might work would be to power the joule thief from the output of the 555 and just blink all of the LEDs at the same time from the joule thief's output. Any help would be appreciated!

Posted by amklose 8 years ago

which IC does sonic screwdriver's circuit use?

I want make a screwdriver but dont want spand 10 pounds to buy a new one and take it apart for a circuit, i want make it under 2$, which IC does they use in the toy? 555 timer? can provide organial circuit desgin? thanks alot

Posted by EthanY 2 years ago

555 Car Flasher unit circuit

Hi, I'm wanting to put some led indicators in my car because they are so efficient but my current flasher unit isn't designed to run such a low load.  It is also relay based which probably isn't the most efficient way of doing things and with it being an old mini it sometimes rattles itself at whatever rate it feels like flashing at at the time so I wanted to use a transistor instead. I've come up with the circuit attached and built it but when it is running all the indicator lights for the hazzards, the transistor gets hot! Surely there is a better way of doing it? Could someone have a look and see what could be changed? I don't know much about transistors but I know that I'd be better getting it to 'saturate' and act as a low resistance switch but I don't know how to achieve that.  It also has to run under two loads, indicators and hazzards, and has to flash at the same rate for each - between 1hz and 2hz. I think a variation of this circuit might be better (it makes use of the discharge pin rather than the output pin), with the load at the ground side of the transistor because it has to be an output pin on the flasher unit. I've got some BFY51, BUY82, BD743B so it would be great to use one of them. in short: what's the best solid state fixed rate 12v flasher driver using a 555 that can supply around 2 amps using as few parts as possible? Thanks for your time, and sorry if I've done anything wrong!

Posted by arichardson 6 years ago

(SOLVED) 555 LED flasher slows...

I am attempting to recreate Duck210's guitar LED mod. However, I am having problems with the circuit. As I have said, it gradually slows to an ultimate stop. Any ideas? Please help! Thanks in advance,     ~H4ZZ

Posted by __DELETED__ 7 years ago

555/551 timers 55* Same or Different?

Hello! I'm interested in knowing what timers are the same as the basic 555? Is a 551 the same thing? I am also looking for equavalent Timers that operate in the same way, and have almost identical pinout thanks!

Posted by Sandisk1duo 9 years ago

Delay Power To a Solenoid Valve

I am making a pneumatic cannon with a solenoid valve which is turned on by a switch. However, I am wondering how I could delay the switch. So, when I flick the switch the cannon doesn't instantly fire, instead it would be delayed by maybe a half a second or so for effect. Would I use a 555 timer? I'm really new to this, so could you tell me how I would go about doing this? Thanks Guys

Posted by Make me a SANDWICH 8 years ago

555 TImer/Chip Help

I need your help people of Insturctables. I am working on an project, and I need to make a circuit whit a 555 timer/chip so that it makes,for example, an LED light up in every 2 second. I mean when it turns on, it needs to be on for 2seconds than off for 2 second...loop. ON(2 seconds)___OFF(2 seconds)___ON(2 seconds)___OFF(2 seconds)___LOOP I need the output to be 12V. Actually I need it for a fan to turn on and off(the fan runs on 12 volts) Can you help me make a circuit for this, what value of the resistors and capacitors do I need... It would be grate if some one could make a schematic of the circuit in Eagle, or so... If I make an Instructables about my project I will surely mention who helped me realize my idea! Thank you all! -Stanislav

Posted by comodore 9 years ago

Annoy-A-Thing 2.0 Development

Annoy-A-Thing made by let_it_out_org.After seeing some interest in developing a second iteration of the device, I thought it could be a good idea to start a forum thread for the development.I think the device should ; Beep at random (or kind of) interval, Use a 555 or a 556 timer, and it should not be powered by a microcontroller.

Posted by lordofthedonuts 9 years ago

What a 555 timer does in layman's terms / simple universal timer

Hi folks,I'm helping my daughter make the universal timer kit linked below. She needs to be able to explain a bit about how it works. Everything I've found on the 555 timer is very complicated - we don't need how it ACTUALLY works as such, more a simple analogy.Something like that 'the circuits inside the chip switch on and off so that it outputs a pulse of power. controlling how much current goes into the timer regulates how fast it creates a pulse. This pulse gradually charges the capacitor. When it's full, it discharges and activates the buzzer.'Well that's the best I can do at this hour of the morning anyway! If someone could correct and add detail to this it would be very helpful!thanksHelen;=universal+timer&form;=KEYWORD

Posted by ozgeek 9 years ago

Implementing astable multivibrator using transistors

Hi guys! So i wanted to construct a basic astable multivibrator using two transistors, so that i can demonstrate a friend its working. The basic circuit according to me is something similar to the file i attached. So can it be implemented practically without any problems or any modifications are required? I will mostly be using a 220-12 v transformer along with a rectifier and a filtering capacitor as the power source. My load will mostly be a few LED's. Although i wanted to show him using 555, i think it would be better if i show him the basic circuit first. I will show him the 555 version later. (Although i ran out of components this week including 555, and i can only get them next month :P)

Posted by charmquark 5 years ago

Resistors and speakers

Hi, Is it possible to create a 16.5-17Khz speaker output using only resistors? or should I look into a 555 timer? if so, how? Thanks, Dan

Posted by danward 7 years ago

How to connect 555 signal generator to Tesla coil or other High voltage application

Hi all, I hope everyone is well. I have 2 circuits here and was wondering if someone would show me how to connected them, it is probably very simple, but I just want to be sure. here are the 2 schematics I'll be working with... I assume I just use a common ground... but we all not what assuming makes us :)  Thanks all in advance, 

Posted by dalmond1 6 years ago

I think I am starting to really lose it....

I was building the "Evasive Beeping Thing" from Make. A search through all of my "parts" finally got me resistors and caps of approximately the correct values I wanted *even though they are not specified in the article :-( ". After nearly a fortnight, I finally was ready to test it. hooked up a nine volt battery, and.....nothing. Fearing the worse, I touched the 555 IC...and it was hot as blazes. 2 days of inspecting the circuit and trying to make sure no shorts were occurring, I finally gave up and unsoldered the whole thing. I then through together a quick 555 timer circuit using an ic socket, in order to test if I had destroyed my IC. That didn't work at first (but just in case, I tried a 555 I knew was good, and that did work). Just before throwing out the assumed defunct 555, I looked at it under a brighter light (and low and behold, on the IC was written in very small worn type: 741. It was an op-amp ! I could have screamed....*sigh*. Oh well, at least I got a tester out of the deal LOL *sigh*

Posted by Goodhart 9 years ago

Vdc to Vac

Hi there hope someone will have some info....anyway what I'm after is a schematic or similar for an inverter 13.8Vdc to 2000Vac with a variable square wave oscillator so i can adjust the frequency possibly incorporating a 555 will be @ 50% duty

Posted by Narnies 10 years ago

Tesla Coils For Dummies

In my slideshow, not all of my uploaded images are showing! Please correct the mistake.

Posted by Xellers 9 years ago

using 1 watt LEDs with a 4017

I want to build a chaser type light array using a 4017 counter divider circuit, 555 timer and the ever popular 1 watt luxeon LEDs, but I don't think that the 4017, or the 555 can withstand the current that will be going through them. I know in most cases you can simply toss a heatsink on the component and it will be fine, but I don't know if this will work with the ICs.;=10001&catalogId;=10001&productId;=12749Here is the spec sheet for the 4017. Thanks

Posted by John Culbertson 11 years ago

I will paypal someone $10.00 dollars to draw this in breadboard fashion for me!

Hi, I really need help. I've been working on this dern motion detection alarm and am having problems with the delay circuit. I think I have assembled it right and it never works. I have completely re-done it twice! What it is supposed to do is once power from the relay is sent to the 555 timer it will impose a 1 minute delay before sending the power to the alarm/horn. This gives owner adequate time to enter code to disarm. The relay part of the circuit works fine and sends power to the 555 timer and latches as it should. However, the 555 timer never sends power out of pin 3. Could someone please, please, please draw the attached schematic in breadboard fashion so I can double check everything is assembled properly? I would really appreciate it!!! Anyways I will paypal someone $10.00 dollars to draw this in a breadboard layout for me!

Posted by swilus 6 years ago

Oscillator Help

Hello, I was wandering if you guys would like to help me out with a quite simple little project. I am looking at making a simple oscillator that could be pumped through a normal musical instrument amplifier. I'm not looking at using any IC's (555, PIC etc...), simply some resisitors and capacitors connected to a audio output and a Rheostat. So my question is this. An oscillator (in terms of electronics) is simply a electronic current that goes from one very high frequency to a very low one, right? So could a just use a fairly big capacitor and a very big resistor and would it be listenable through a speaker?

Posted by dipseydoodle 6 years ago

pcb board desinng

Hi im creating my pcb but i have 2 555 timers and its getting too complicated,all wires are overlaping and its a big mess i would appreciatte if someone can help me with the dising,thanks very much,

Posted by NelsonN2 3 years ago

Make a Ghetto Simple LED Flasher :)

No programming or 555 Timers are required for this incredibly simple project.Using a pop can, a small motor, and 2 LEDs you can create an LED flasher. Full write up:

Posted by Joe426 10 years ago

Replacing IC's with components

It it possible to use simple components, arranged properly, in order to replicate the use of a simple IC, such as the 555 or LM386? If so, where could I find diagrams of the internal electronics? Google has turned up nothing so far... Thanks!

Posted by jeffconnelly 6 years ago

Switch problem

I have a question for the electronics gurus out there. I have a circuit that I want to activate for a set length of time (I'm using a 555 timer for this) when a door is closed and not operate again until the door is opened and then closed again.  I'm an electronics newbie.  The one-shot 555 circuits I have seen rely on using a momentary switch, but in this case the switch will remain closed as long as the door is so the circuit will remain active.  Are there switches available that will close and open while remaining fully depressed?  Or is there an equivalent circuit that will work with an ordinary momentary switch? Two more things:  the door is very small so the solution must be small; also the circuit will run on batteries so the solution can't be a power drain. Thanks in advance, I hope this makes sense to someone! Kerry

Posted by number8wire 6 years ago

LED Circuit Help

Https:// I would like some input on making this using a 555 timer and POTs to make an adjustable fade in/fade out circuit while running on a 9v battery and using a pressure switch to turn the LEDs on when the box is opened.

Posted by YoungOne453 4 years ago

Help creating a counter

Hi all, I'm new to creating circuits and to instructables Here is my problem. I'm trying to create a Circuit that will count to 30 as fast a LED flashes that uses a 555 IC, once it gets to 30 you will need to press a button to reset it or the LED will stop flashing. Thanks in advance.

Posted by spike314 10 years ago

High Voltage Ground

I'm starting to work with high voltages again, but for real this time. I just built an ignition coil driver, using a 555 (and I got an ignition coil), but my 555 broke (the texas instruments ones can only drive 15mA, oppose to the normal 200mA, oops) so I have to go buy one today. My main question is what to use for ground, whether it be for an old screwdriver for arcing sparks or the secondary of a tesla coil. I was originall just going to use the 3rd prong of an outlet, but somewhere on the internet I heard this could destroy all surge protected power strips and destroy all plugged in electronics at your house. I, of course, do not want this cause... well... I'd be screwed. Is this true or not? Can I use the 3rd prong?

Posted by guyfrom7up 10 years ago