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 7 years ago


wrist timer

Can anyone build me a wrist countdown timer? PM for details

Posted by gio_13 1 year ago


Dual timer switch

Is there a commercial dual timer switch that the first timer can be set for longer duration like hourly or half hourly and then switch on another timer that run in seconds. Or is there a DIY solution? Eg. Turning on a water sprayer every 2 hours for 10 seconds. I need a timer that run from the mains.

Posted by TanJ21 4 months 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


Timed Shocker, or Shocker w/ a Timer

I was wondering if anyone knows how to build a shocker hooked up to a timer? Or at least how to hook up a timer to a shocker? If anyone can show me how to hook a good, strong shocker to an electronic timer, i'd be grateful. I already have a timer and i can post pics of it's insides if anyone wants a look, it's the one i plan to use. I was hoping to rig it up to the world's smallest shocker. Thanks in advance.

Posted by DeletedUser 9 years ago


Timer to flip light switch?

I need a timer that will mechanically operate a wall switch for a light. I've seen a device years ago for sale in the various "gadget" catalogs that did exactly this. It attached to the trim plate around the light switch using the 2 trim plate screws. A battery powered digital timer operated a mechanical slide to operate the wall switch. I can't find this device anywhere now. I know there are many electronic timers that replace the wall switch and have timer capability, most do not work with compact flourescent lights. I'd really like to find a timer for sale or get some ideas on a simple way to make such a device. Thanks for any help. Scott

Posted by tscottme 10 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


Meditation Timer

I'd like to modify a simple egg timer for meditation.  My current timer makes loud harsh staccato beeps.  I'd really like a timer that made something that sounds like a long slow deep bell when the time is up. I have no idea how to do this but I'm guessing someone does and can do it for less than the $100 ones they sell in the glossy Buddhist catalogs.  Any help would be great mattcadorette@hotmail.com

Posted by mcadorette 8 years ago


DIY timer project NEED HELP!

I'm looking to get a timer like this made for a movie prop, but know nothing about electronics. Anyone insterested in making one for us? How much would you charge? Post a reply if interested!http://www.frisnit.com/timer/index.html

Posted by mrshow555 11 years ago


Electronic timer

I want to make a timer that sounds an alarm every three minutes, pluss one for setting a seperate alarm for 1 minute.  It is to be used during cpr, (treatment cycles are 3 minutes. 1 minute from shock to circulation check.  Can anybody help me??

Posted by leidulv 8 years ago


Gym Interval Timer for Crossfit

Would anybody know how to make an interval timer like this one: http://www.amazon.com/gp/product/images/B004YPI5T0/ref=dp_image_0?ie=UTF8&n;=3375251&s;=sporting-goods Preferably one that doesn't cost 250$ but still is large and clean. Thanks!

Posted by datsy13 7 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


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!thanksHelenhttp://www.jaycar.com.au/productView.asp?ID=KJ8108&keywords;=universal+timer&form;=KEYWORD

Posted by ozgeek 9 years ago


Rigging a timer to a motor - Need Help

I'm making a pickup winder, which is simply a high rpm motor attached to a pot and a switch, but I want to attach a timer to it so that the motor stops when the time reaches zero.  If it helps out at all, the timer I'm using is a Radio Shack timer, catalogue number 63- 248.  If any of you folks could help me out at all with this project, I would be eternally grateful.  

Posted by CBecker 8 years ago


Computer controlled timer

I am building an indoor hydroponics room to grow herbs and tomatoes year round. I would like to be able to control the lighting and the water pumps with my computer. Any ideas? Thanks!

Posted by InsaneLunatic 8 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


Microwave Timer project....

I was wondering if anyone could help me figure out the proper way to connect a 5V battery power source to this microwave timer (pictured) I read this post- specifically the comments, but am worried I might fry the board if I do it wrong and with a 50/50 shot I'd like to ask the experts first. I've provided pictures below. Thanks for any help you can offer.https://www.instructables.com/id/Digital-timer-for-any-electrical-appliance/?ALLSTEPS

Posted by mrshow555 10 years ago


trying to find battery holder with timer switch?

I've looked everywhere I can think of, online and off. I'm trying to find a battery holder (2 AA or 1 C) with an incorporated timer switch. I'm trying to make a flameless candle with a timer. This is what I'm looking for...someone obviously makes them or something similar. This one has a four hour switch. TIA

Posted by lorraineg57 9 years ago


mutliple timer relay with min/max time

I am looking for an Instructable on making a multiple timer relay with a changeable min/max time to light 3 different lights. Ex.: 1 to 2 minutes, light 1 at 1 minute, light 2 at 90 seconds, 3rd light at 2 minutes. when light 2 comes on, light 1 goes off, when light 3 comes on, light 2 goes off. Thanks!

Posted by Roger13077 9 years ago


Request for timer

I would like to make a timer circuit for one or two digicams. Something which would press the shutter button at a desired interval, like from 30 sec to several minutes, to make high resolution timelapses. (2 cameras for stereo, or visual - infrared) I know this should be easy, a simple circuit with relays, but having no knowledge of electronics it would help to have it pointed out step by step)

Posted by BobS 11 years ago


Tiny timer with display

Hi I want to make a timer - a very small one - for using in school, for cookling and so on... It needs to have a display with at least four digits, five buttons(reset, on/off, start/stop, minutes and hours). I'm planning on powering it by a CR2032, or another button-sized battery. Does anyone have schematics or circuits I could have a look at? In advance, thank you:)

Posted by simo9836 7 years ago


Circuit Timer

I would like to be able to set a time, small like .5 seconds, and be able to power a 12v circuit for that amount of time, any ideas? 

Posted by ReconIII 4 years ago


Would like: 4-hr count down timer

In the summer, i'd like to run my fan for the first 4 hours of the night. After that the rooms cools down enough where I don't need a fan. I've searched everywhere and cannot find a cheap 4-hr countdown timer. I have found some for $50, but that is outrageous. I cannot modify a mechanical kitchen timer because those are only 1 hour. So, does anyone have any ideas to make a 4-hr countdown timer that turns on a 110v circuit for 4 hours, then turns it off and leaves it off? Forgot to mention. I go to bed at different times so a regular on/off timer would not be optimal here. Thanks.

Posted by chuckr44 11 years ago


Magnetic Switch Paired with Timer - Help

Hi All, I am a real newbie in electronics, and have been researching. I want to build a submersible pump, using (5 gallon bucket, a toilet flush valve and a pond pump -120 volts). What I need is some way to control the pump so its not running 100% of the time. What I need is a Timer which would keep the pump running for X minutes and a magnetic switch which would activate the timer once the toilet flush valve is at a specific level.) I dont know how to set this up, I found 555 timers on amazon but not sure which ones would serve to what I need this one seems to be what i need but it is 12 volts http://www.amazon.com/Velleman-K2579-Universal-Start-Timer/dp/B000TA7A04/ref=sr_1_fkmr0_2?ie=UTF8&qid;=1420401325&sr;=8-2-fkmr0&keywords;=555+timer+10+minutes maybe this thing would work http://www.amazon.com/Packard-PTD102-Delay-Timer-Relay/dp/B004UVP90Q/ref=pd_sim_e_14?ie=UTF8&refRID;=1HAEQTK68GZRVFP7XHFZ Can someone recommend how to go about building something like that? Or maybe there is something similar already built? Thank you very much!

Posted by agitman1 3 years ago


Hacking a 1-sec accurate timer

Hey all, For my digital SLR camera, I've hacked together a cable relase using a three-way switch. This works a treat, and now it's time to graduate to full automation to help with night time navigation. For this I need to build a timer that keeps a switch in the 'on' position for a certain number of seconds. The timer needs to be accurate to the nearest second, so nothing fancy. Ideally it would be a number pad I can type into the number of seconds. So any ideas? I'm putting together a short instructable to make the cable release. Cheers, Pierre

Posted by eKstreme 11 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


I'll pay you to build my idea

I want to build a wrist countdown timer. It will look like a fitbit or any other health tracker wrist band. however it will have only a countdown timer and that's it. nothing else. It has to be chargeable. 

Posted by gio_13 1 year 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


Relay Timer

I am currently engaged in a project where i need to create a count down timer relay controller. i was thinking of using a digital alarm clock as part of my goal is to have the display visually counting down, but i don't know of any that have a count down feature. i want the timer to power a relay to turn a string of IR emitters on for several seconds. i have a digital kitchen timer that counts down, but im not sure if it will work. i would like to use the power to the buzzer to activate the relay but there is no stable current there, it only Emits several beeps in quick succession(when i meter it, it comes out to about . volts). this is why the alarm clock would be better. i was hoping to use an electromechanical relay but i don't think it will work. does anyone know of another relay that will trigger with this kind of input?

Posted by gedion4000 9 years ago


Pinewood Derby test track timer

I would like to have a timer for testing changes to pinewood derby cars.   Need to have a trigger a the top of the track and one at the finish line.  Could be stand alone with time display or output to a PC for capture of each run.   Better still would be a second set of trips to give a split time 1/2 way down the track. Since this will be used for testing, it only needs to measure time on one track.  Simple and cheap.

Posted by Steveobe 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


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


Timer Mod question

Anyone know how or if it's even possible to mod a countdown timer like this one:http://www.goldmine-elec-products.com/prodinfo.asp?number=G15871to have an led segment display like this: http://www.allelectronics.com/images/gold/full/SDA-801.jpgwould i just need to take off the old time and solder the segments of the new display accordingly?

Posted by mrshow555 11 years ago


Competition Shooting Timer made with Arduino

I have only begun to use Arduino in the last few months, and my skill set is still somewhat lacking.  I can easily build the circuit that I need, however programing is still difficult at this point.  Especially trying to write my own program from scratch. I am looking for help to make a Competitive Shooting Timer for IDPA competitions(international defensive pistol association).  In my head it should use a piezo speaker as a microphone on a digital input, have a couple LED's for currently working and ready status, an LCD screen that shows the time lapsed since the first shot occurred to the hundredths of a second, and a push-button to stop the timer. Any help would be greatly appreciated!!

Posted by gothiway 3 years ago


One shot delay timer switch without a microcontroller?

How do you output a single short pulse in an electronic  circuit after a specific period of time has elapsed after the circuit is powered on such that when the circuit is powered on, the output remains zero for x seconds then it becomes +5 V just once for y seconds then again back to zero for the remaining time much like monostable mode of 555 timer except that the pulse here is output in the middle i.e. 0v-5v-0v. Can this be done without a microcontroller?

Posted by raftor 4 years ago


Switch Timer

Good day, Please i have 2 bulbs/leds, one is green and the other is red. I want to put a time switch between them so that after 10 minutes the red switch off and the green lights up and vice versa till i switch it off. So do you know of any switch that i can use for that purpose, that will operate under 12v, like 5v. Please thanks

Posted by Don Amada 4 years ago


Anyone know any good timer progams?

I have this old, old old old old old old laptop that I am trying to do something with. Right now it is running windows XP (on 65mb of RAM!!!?!?!?!), because no Linux distros would recognize the external pcimcia cd drive. I got the idea of using it as sort of a "time bomb" for airsoft scenarios. The program I am looking for would be a sort of glorified kitchen timer, and would hopefully make beeps as the time goes down, once every one minute and then every second for the last 30 or something. Anyone know of a good program to do this with?

Posted by l0cke 10 years ago


How to add a 30 minute 110v timer into an existing wall heater?

My bathrooms are heated by in-wall electric heaters that are controlled by a rheostat type knob on the devices themselves.  I find that they often accidentally get left on for long periods of time (a safety and energy usage concern).  As such, I would like to add a timer into the existing devices that would cause them to shut off after 30 minutes (the timer would be reset by turning the heater off).  I know that they make wall switches which can accomplish this task, but due to limited wall space I would prefer to not have to wire a new switch to the heaters.  My goal is to find a small circuit board that I can add between the existing control knob and heater.  It would need to be small and heat resistant so that it could be placed inside the heater itself.  Anyway, I have been trying to find such a device online but haven't had any luck finding one that runs on 110v and can be added directly into the existing circuitry.  I was hoping someone on this site could point me in the right direction. The heaters are both tied to the same breaker and are the only things on that circuit so another option would be to place the timer near the electrical panel.  However, this seems less desirable to me as you wouldn't be able to turn on the 2nd heater if the 1st heater had been left on and already tripped the timer.  Please correct me if I'm wrong about this.

Posted by jenkins3333 4 years ago


Solar operated timer - NEED Help Please...

Hello everyone!I need help!I have an idea of a product I'm designing to get accepted to a design school.I need help since I have very little knowledge in electronics.I need a circuit for a timer... an egg timer with a twist (I think)Should have a switch (click type), 1 Buzzer, 6 indicator LEDs, and I take it that some kind of Controller (I have no idea what kind) and should work with solar power.Should work as follows:You press the switch once - one LED is lit and the timer count back 10min. and then the buzzer will go off. press it twice - 2 LEDs are lit and it will count back 20min till the buzzer goes off... and so on up to 60min.If 6 LEDs are too much for Solar power, 3 are also OK (30 min timer) or NO LEDs, but a "beep" indication for each press / 10min. time.I hope it's possibleAnd thank you all for your HELP!!!Take a look at the attached picture... Just to get a laughET

Posted by etgalim 11 years ago


Mechanism for mechanical timer

Hello everyone, My wife and I both feed the dog, but we're never sure whether the other's already done it or not.  (the food disappears pretty quickly)  I'd like to build a track with a slider that takes about 10 hours to slide from 'fed' at the top to 'not fed', and make it so that the slider is easy to slide back to the top. What immediately comes to mind is a counter weight escapement mechanism, but I though I'd hit up the brain trust to make sure there wasn't a simpler way to pull this off.  (I could also envision a timer chip hooked to a mechanical release, but I'd prefer to stay wholly mechanical for this one.) Many thanks!

Posted by oldmicah 6 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


Agility and reaction timer for sport

Looking for someone who can make a agility/reaction timer or make the plans for it so it can get to work. Found on YT (https://www.youtube.com/watch?v=820YiXvPF9I (after minute 10') Great for sports like badminton. One controler that choose the direction left/right and times the reaction-time. Timing is optional for me.... Found it also in Japan on internet www.onigoe.net But making one with flashing light with adjustable timing. Random left/right. Anyone?

Posted by broow 1 year ago


LED candle help

Hi folks! This site is so inspiring! I'm looking to hack a battery powered holiday LED window "candle." The missus likes it because it has a timer to shut off automatically after 6 hours; however, we don't like the way the "flicker" looks. We'd much rather bypass the flicker, but the timer and flicker are all on the same sealed bit of circuit. So, my question: is there an easy way to put a tiny (maybe 3/8") 6-hour timer on an LED? Thank you in advance! --Kiribub

Posted by Kiribub 11 years ago


Arduino timer with photoresistors

For a science project i need to be able to measure the velocity of an object, to do this i planned to use arduino to measure the time between the object breaking a laser pointers beam onto a photoresistor and it breaking a second similar beam/photoresistor a set distance away. Alas ive had some trouble with the photoresistor side of things, can anyone describe how to properly implement a photoresistor? such as which ports i could connect it to and how to read when the beam would be broken.

Posted by shabaki 5 years ago


wind up timer device

Hi all can someone help me find out a way to make a wind up timer? - all it needs to do is manually wind up by hand, unwind through a series of gears slowly.....but needs to have a strength of about 2kg/cm torque. something to unwind for about 30 minutes would be perfect is there anything out there which can be used..or a simple way to make using spur gears and a coil spring? many thanks

Posted by oem_odm 8 years ago


Automated Garage Door Timer

I have the bad habit of leaving my garage door open sometimes. To come home with your garage wide open is pretty scary. So I was thinking of this idea...  The garage automatically closes after 5 minutes. But that's pretty annoying so I figured you could install a switch underneath the garage door opener that will leave the garage door open. Any ideas on how this could be done or more suggestions? Thanks!

Posted by BrianKT 8 years ago


liquid motion timers (aka density timers/toys) What's in them?

You know those liquid motion toys you often find at places like Spencer gifts in which a denser liquid (usual bright colored) drips down onto a spiral and you can watch this discrete bubble ride on down? I'm wondering what's inside them and if its feasible to make your own. I've heard lots of things, that the clear liquid is usual a light oil and the colored part is water. I've heard the reverse, I've also heard that there is no water in these things that both are different oils.any help would be appreciated. if your still wondering what im talking about heres a place that sells them : http://www.officeplayground.com/spiraltimer.html

Posted by SpinningCone 10 years ago


WANTED: Simple Appliance Timers for a good cause: Our community garden

Hello community! My communal community farm here in Chicago sends all its produce to a local food bank. Yay! So this year, to boost output, we're looking to help equip our volunteers with seedling starter setups, which include a crazy full-spectrum lamp and, notably, a timer to control the lamp. We'll be buying the lamps, but would anybody in the Instructables community be interested in building us some timers? No dynamic programmability needed, just has to stay on for the same hours every day this spring. I would suggest one of the projects already featured on this site, but none of them seems to be capable of the long hours that the present application demands. (Or maybe one does?) Something mimicking the functionality of this device would be ideal: http://www.amazon.com/Woods-50006-Indoor-24-Hour-Mechanical/dp/B006LYHED0/ref=sr_1_6?ie=UTF8&qid;=1361900546&sr;=8-6&keywords;=timer+outlet Please let me know if you're interested. If you'd like to hear more about the community farm and the good work we're doing, check us out at http://altgeldsawyer.cornerfarmchicago.com Thanks all!

Posted by pefty 5 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


DIY clock panel

HI, I work for a church and we have a major problem of losing track of time, we've been looking at buying a large digital timer, but there expensive. Does anyone know how to build a panel that is pretty large (1'x3') that can be controlled, or start/stop/reset?

Posted by drew240 8 years ago