NE555n timer or NE555p timer? Answered

Please Help. I want to know if I should buy a NE555n timer or a Ne555p IC. Can I do the same things with each? Is there much difference? Thank you guys, Electronicsloser

Question by HavocRC   |  last reply

Relay timer?

I asked this question in forums before i knew about this so sorry for the copy. i hope someone can answer this here. 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?

Question by gedion4000   |  last reply

555 timers?

I was wondering if there is a difference between a ne555p timer chip and a ne555d timer chip, and if there is then what is it? if there is a difference between them, then where can i buy a ne555p timer in australia? :)

Question by jcolefran   |  last reply

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)

Topic by BobS   |  last reply

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? 

Topic by ReconIII   |  last reply

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

Topic by Don Amada   |  last reply

Arduino with timer? Answered

I'm not very good at coding so I want to come to you guys again. I need help with a sketch or code that allows me to have three inputs and one output. When one button is pressed, that Arduion pulls the output high for an amount of time dependent on which button is pressed. These times are 3 seconds, eight seconds, and twelve seconds. The output will be connected to a small relay, which I already know how to do. If I could get any help that would be great. Thanks.

Question by mrmerino   |  last reply

advice about timer?

I need cheap small timer to use in my device ( voltage protector) to use in control of warranty of 3 months, this timer will connect to led and when the time is finish (3 month of real working) the led will off, this timer should calculate the time of electricity working only ( if electricity cut off the timer not calculate the time when there is no electricity)  the timer continue calculate the time of working only is case of electricity is exist. when the total time of electricity on (exist) reach 3 months the timer will cut off the power on the led so will turn off the led

Question by rubellamarket   |  last reply

240 volt timer ?

Hi all I have a 240v fog machine makes fog like a disco I wish to run it on a timer. For an outside dragon smoke display. I can easily time it purely off /on with a basic 24 hour  household socket cheap timer MY PROBLEM The fog machine after getting power needs a press of a button to activate it. I need a circuit / timer  so  that when it gets 240v power can then "press the button "ie activate I bought a hi tech machine to try  but it loses it's memory setting when timed out on  240v. I need something that keeps its timer cycle intact. Maybe an expert out there can help? Happy to modify something etc. Nick Tasmania

Question by tassie2   |  last reply

Electronic timer circuit.

I have a 9vdc supplying 3ma constant current. I wish to switch polarity automatically every 5 minutes with a timer. How can I do that simply?

Question by rhhince 

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.

Topic by mrshow555   |  last reply

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, 

Topic by HavocRC   |  last reply

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.

Topic by shabaki   |  last reply

timer-control of PC?

I'm trying to find a simple way to turn on my PC multiple times each day. I use the BIOS to turn it on now to record radio streams. I'd like something external to the PC, and something I could use to set several On Times each day. I don't know where to start. Should I attempt adding a relay to parallel the PC's power switch and then activate the relay? Should I attempt to build Rube Goldberg mechanism to mechanically activate PC's power switch? Wake-On-Lan doesn't seem to be the answer as how would I reliably send signal while I sleep? Even if you don't know of something specific, I'd be interested in where to look or approaches to investigate. Thanks, Scott

Topic by tscottme   |  last reply

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.

Topic by qwertyboy   |  last reply

Arudino countdown timer? Answered

I'm looking to make a countdown timer for my local card shop for games of Magic (nerdy, I know). However, I think I jumped the gun, as I have no idea how to do this.  My plan is to us an arduino nano/barebone arduino as the brains to this, make my own 4 digit 7 segment display, and have give it a programmable time (nothing over 50 minutes) along with a start, stop, and reset button.  I've done quite a bit of looking, and have yet to find something that matches my needs or comes close to it so I can reverse engineer the code a bit. Any sort of help on this would be greatly appreciated!  Should also mention I'm a tad bit of a newbie to C. I know enough to know where i need to look for a good chunk of things, but thats for simple things like "make this LED blink according to these random inputs"

Question by DoctorWoo   |  last reply

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:)

Topic by simo9836   |  last reply

Running a 555 timer? Answered

So, I have this program that I got online that simulates a 555-timer. Basically, if you want it to put out X Hz in Astable mode, it'll tell you which capacitors to use and stuff. It'll also show you how you can modify the duty cycle.  I'm wondering if anyone can explain something to me: When I run the program in astable mode, the duty cycle must be above 50%. I want to power an LED that flashes very briefly, but has a relatively large interval of being off until if flashes again. Something more along the lines of a duty cycle of maybe 5%-20%.  First, could you explain why the program constrains the value like this? Is it because the 555 can't run at a duty cycle that isn't greater than 50%? If that is the case, why can't it? Second, if I can't run it like that, what would you propose I do to power the LED in the manner I described? btw, if you want the program follow this link: It's actually a pretty cool program! :D

Question by tylervitale   |  last reply

555 monostable timer

I've no idea what I'm talking about here but can only explain what im looking for which is help. I'm basically looking for a relay or multifunction relay not really sure but here's the plan. When my smart plug is turned on (at certain programmed times through the smart plug app) to provide power to a 12v 6amp pump (I have 240v ac to 12v DC transformer pluged into smart plug I'm in uk) I would like for this pump to turn itself back off after 10 or 15 seconds. I cannot for the life of me find an analogue or digital timer that can do seconds. The smart plug can work down to minutes and not seconds. So basically smart plug on = pump run for 15 seconds cuts itself off and then the smart plug turns off once the minute is up and when plug is on again at next programmed interval it does same thing. Any help would be great as I've no idea what I can buy or try to make thanks When trying to research I hear about 555 monostable circuit but I don't know how to wire something up or what to buy to make this work.

Topic by croyf85   |  last reply

Moon light timer

I would like to build a led light that switches on and off with the moon. On when the moon rises and off when the moon sets. Would also like no leds on at new moon and an additional led comes on until full moon is reached. The process then reverses an an led goes off until new moon with no leds on. I would also love the light output to be 4150k the colour of moon light and about 1 lumen at 1metre distance.

Topic by Ausie Steam   |  last reply

Using a microwave oven's timer as the mains timer switch?

I have a timer switch from an old dead microwave oven. Can I use it as the mains timer switch? If yes, how do I connect it. The timer looks exactly like what is shown in the following picture: (The picture was not taken by me. It is from an article on useful things that can be harvested from  dead microwave oven.) Also, if possible, please mention the functions of various pins or give a link to an explanation.

Question by raftor   |  last reply

Electrical Timer. I need a timer for a Halloween prop.

It's a cadaver that trembles continuously. It runs on standard house current. I'd like it to tremble for only a few seconds at a time, then nothing for 10-20 seconds, then repeat.

Question by    |  last reply

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!

Topic by Roger13077   |  last reply

i need an electronic circuit timer diagram

1.It must be electronic needs to have the ability to set somthing off like an alarm. must be small does not need a display needs seconds and hundreths of seconds must be programed electronically. like by a computer or somthing smaller.

Question by playpep   |  last reply

Can I use a 555 timer to cycle on 1 minute and off 1 minute? Answered

I am kinda familiar with the 555 timer for flashing lights and such, but I am in need of a circuit which will cycle on for 1 min and off for 1 min. Can this device (555 timer) be used for such low frequencies. It will ultimately control a 12v relay to run a bilge pump in an Instructables evaporative cooler which I am making (this mod is my idea which I will share with the original inventor if it works). I guess that if the low frequency is possible I will also need a power transistor to step up to the voltage/current needed to operate the relay. Any help greatly appreciated........ Thanks, Peter :-)

Question by ppowell14   |  last reply

How to build electronic timer?

I would like to build a 24h timer which will operate for 1min at each iteration. For example: each day at 20:00 the timer will light a led for 1 min.

Question by chenr2   |  last reply

Electrical timer for a water heater

I would like to have a water heater of mine turn on and off with a timer.Its important that the range of the timer is from 0 - 20 minutes. its also important that it can switch on an element that will draw 2000 watts. The timer must be a simple dial and knob type not a digital programmable. It can also be a press button for the amount of minutes example: press 7 times for 7 minutes? any ideas Dino

Question by jollyboats   |  last reply

Gym Interval Timer for Crossfit

Would anybody know how to make an interval timer like this one:;=3375251&s;=sporting-goods Preferably one that doesn't cost 250$ but still is large and clean. Thanks!

Topic by datsy13   |  last reply

Need to operate a timer with a remote

I have a 6 Volt radio frequency remote control pair and a separate board with a 5 to 12 Volt timer circuit that turns power off to a load after 1 to 300 seconds. The timer circuit uses capacitors and resistors including a variable resistor plus a 555 too plus jumpers from to see a picture,it lists as: GEREE Timer Relay Switch 1-300 second 5V 9V 12v DC input TIME OVER RESET Delay. Will it work if I connect the RFRC to power and then from there wire to the timer and then wire the timer to my load so that I can remotely make the timer circuit  operate my load for the set time? I ask so as not to burn a thing that takes weeks to get. Will the 1 channel remote control receiver's single relay reset back into a NO condition from NC after current stops flowing from the battery power and through he remote control's 5 pin relay into the capacitor(s) of the timer circuit, that is to say, will the remote relay reset to NO after the timer's single relay goes back from NC to NO after the capacitor(s) run out of charge? As a note, I have had very little success finding a remote controlled timer in the 6 Volt range. 12 Volt remotes with timers are easier to find but that is too much power, size and expense for my application. Know of a supplier? If I have enough of this correct to make sense then any wisdom in this matter will be greatly appreciated. Thank you, Vince

Question by vincenix   |  last reply

How to make a timer switch? Answered

I want to make a timer circuit for my aquarium light so it  stays on for  12 hours and off for 12 hours. Can anyone provide a circuit diagram?

Question by Ahtasham Ahmad Mohtashim   |  last reply

How to Make an Electronic Timer? Answered

I need to make a circuit for an electronic timer. It should have an ONtime= 23hrs50mins and an OFFtime=10mins. I was thinking of using an Arduino/Arduino standalone connected to a relay for this project. Any Ideas do share

Question by Jonathanrjpereira   |  last reply

cmd prompt timer command? Answered

The -t function (timer/countdown in seconds) for my cmd prompt is not working properly, is it just me, or is there something wrong? here is the command I was trying to use: shutdown -l -t 15 but when I hit enter, it logs off immediately.  Any suggestions?

Question by dangerUXO   |  last reply

Looking to build a shutdown timer ? Answered

I want to hook something up to a console so that after a certain amount of time say 30 minutes, the console will lose all its power, how would i go about doing this?

Question by connorfrancis   |  last reply

555 timer circuit question

Hi everybody! I need to make a small pcb which will be able to turn on/off a switch about 10/sec, whenever I turn it on. I understand that 555 timer is the easiest way to go.Even better it would be if it was fully customizable like I could set it to open/close the other circuit from 1 to10 times/sec per manual switch on and also set the duration that the 555 will be keeping the other circuit on each time . I am able to do the soldering needed but I don't know the parts needed and how to properly connect the the pcb.Thanks (sorry for my poor English)

Question by c_fish   |  last reply

Using a projector with a timer switch? Answered

I am trying to set up an art installation which will involve a projector projecting a video piece in the middle of the night when unattended. I was planning on connecting it up to a laptop and somehow using a timer switch. I realized though that the projector may go to sleep or may not work using this timer switch option. I would set the video projection up with blank space on the video to correspond with timer so that for example if I wanted the projector to come on in five hours time I would put five hours of empty space at the start of the video meaning that whenever the projector comes on it is timed with where the video is at that point and the video will play. I know there are holes all over this so any advice would be much appreciated! Thanks, Rachael

Question by co701rf   |  last reply

custom electric (110v) timer

I am looking for a timer, much like the kind often used for lamps when you are out of town... set up a timing loop and it cycles power off/on to a device plugged into it. My problem is that all such devices I can find operate on intervals near 1 hour (the quickest I have found has a minimum 15 minute off/on cycle). I need to switch off a device for a few seconds, once each hour or so. My current rough estimate is to go ~59 minutes 40 seconds on, then ~20 seconds off. I may need to tweak that though so something programmable would be great. I am not an electrical pro, but neither am I a stranger to circuits or house wiring. I know all the safety precautions and can solder/assemble components... I would just not be able to come up with my own schematics to create something like this. If anyone is aware of an existing device, I could purchase it... but I would sortof like to DIY it anyway.

Topic by karossii   |  last reply

Cooling Fan Timer Circuit

I'm tying to setup a 12 volt 2.5 amp injector cooling fan in a car and I want the fan to turn on for X minutes right after the ignition key is OFF. I was looking at this programmable relay -;_rd_i=B015Z2EQCU&pd;_rd_r=5202NNSP2PM3EE5DZVTA&pd;_rd_w=SKMnb&pd;_rd_wg=rJ4Td&psc;=1&refRID;=5202NNSP2PM3EE5DZVTA Here is the website for that relay with instruction manual - I'm not sure if I need another relay and hook to 87a or if there is a better circuit I can make.

Topic by pphantom   |  last reply

Network ON/OFF Switch with Timer

Hello there, I am a network administrator and trying to create a simple device to test the alarms on our systems. Since I am not an electrician of any sort, I have an idea of what I need, but no idea of parts or names to order. Basically, I need to have a basic on/off switch with button that I can wire to a CAT5 cable. Simple enough, stops traffic at the push of a button but thats the obvious part. I also need to have some control over how long my connection times out, and after some research, I think a timer relay does that, but I can't be sure. It just needs to turn the activity back on after it goes off say between 1 second and 10 seconds off, the connection turns back on. If I can accomplish that, than I would also like to add a dimmer type device such as that of a light switch dimmer, but smaller and working with less voltage. So... Can this be done with all 3 electric devices? The closest thing I found in searching was some generic Lag Switch, but it did give me a starting idea of how to design it. I drew a simple draft of what I had in mind. Any help by some electric gooroo's would be most appreciated. Thanks! Jonathan

Topic by hannibalxlecter   |  last reply

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

Topic by comodore   |  last reply

Timer in Visual Studio 2008 Answered

I need to create a timer in visual studio 2008. I want to have a Console.WriteLine("words"); and then a timer that delays for about one second before it prints the next Console.WriteLine("words"); Can anyone help me?

Question by Jedrokivich   |  last reply

Switch a relay with a 555 timer?

I have a clap activated relay which I want to use to switch on my computer but when you leave the switch on my PC in the "on" position it just keeps rebooting. Would it be possible to use the relay to activate a 555 timer circuit or similar to the switch off the relay after 2 or 3 seconds?

Question by cheesemarathon   |  last reply

Connect a DC plug to a Timer?

I have 2 strands of led lights that go up a Flagpole on my rv, I am trying to figure out how to connect a timer through the DC Plug Thanks in advance Mike

Question by quine9   |  last reply

555 timer and servo help? Answered

Hello, I just finished building this instructable: However, I have run into a couple of problems with the 555 timer and the servo. As suggested by someone in the comments section of that instructable, when the server turns on it is consuming enough current to drop the voltage enough to mess with the 555 timer's PWM output (I do not have an oscilloscope, so I can't really prove this). Whenever the servo starts, it works properly for a couple of seconds, then it starts acting very strange, stuttering, going the wrong direction, ect... I'm thinking if I add a capacitor the the power source, it will help stabilize the voltage, but i'm not sure if this will work. Any help and/or suggestions would be greatly appreciated. Circuit is running at 6v (4AA cells) Servo runs at minimum 4.8v to max 7.2v

Question by psp3601   |  last reply

Basic Electronics timer watch ?

Hi there im interested to know if any body has the brain and know how to make one of these could be a cool project Kind regaurds John Cook

Question by johncook-2   |  last reply

MAX7219 Matrix LED TIMER

Hello everyone!Im trying to make a simple stopwatch with Arduino using a MAX7219 Matrix module and a button. Ive seen several codes for the MAX7219 Red 8 Bit Digital Tube LED but they don't work for the Matrix.My intention is to create a stopwatch that with one press of the button activates, with a second press it stops, and with the third one it restarts. Does anyone know how to incorporate a stopwatch into the MAX7219 Matrix?Thanks!!

Question by MauroGB   |  last reply

off relay with delay on timer

Hello smart people! I need to pick your collective brain. The project that I am working on is on my car. I am replacing the front turn signals on my car with an LED strip. The led strip has three wires. One for ground, one for white LEDs, and one for the amber LEDs. If it is just directly connected to the current incandescent bulbs, the white comes on as a running light. When the turn signal comes on, the lights flash white, amber, white, amber..... (not what I want) What I want it to do is turn off the white while the amber flashes, then turn the white back on. I have a delay on relay, but that won't quite work for what I am trying to do. Isn't there a way to just throw a cap and resistor to keep the voltage on a relay to keep the white off till the amber is done flashing?

Question by DanielB93   |  last reply

I need to make an electronic timer.

I want to use a electronic timer to set off a buzzer. LED or vibrating motor, or to ignite things, how can i do this?

Question by XOIIO   |  last reply

How to wire a Screaming monkey to a timer? Answered

I have a few cheap countdown timers I  bought off of ebay. I want to wire one to a Screaming Monkey so I hear the Monkey scream instead of the normal beeping.

Question by trek988   |  last reply

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

Topic by eKstreme   |  last reply