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
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 email@example.com
Topic by mcadorette | last reply
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.
Topic by Danielro10 | last reply
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
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?
Topic by gedion4000 | last reply
Hey guys, first forum post. I have just gotten into the electronics field, and I have made a few circuits that I have read schematics from. There's something I want to make, and it's a countdown timer. This is want I want it to have: Be able to count down from at least 15 seconds and be able to change the amount of time Have some 7 segment displays Use the least amount of voltage possible (ie: not need to use the mains or some 12 volt power supply, id rather use a couple of AA's) Have a relay capable of turning on or off a light. And to be as simple as possible. Because I am rather new to this I would rather a schematic, rather than just some help on which components I need to use, because I don't know where they need to solder to where. Thanks
Topic by ryanlg | last reply
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
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
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
I found this simple circiut on jamesyawn.com, and was wondering if and how to change it so that it could time in the minutes, longer than it does already. I don't know anything about electronics, aside from soldering, and basic connections, so try to give a simple-ish answer. I also wondered about what transistor to use (like a radioshack part number). The circuit I was talking about is under "discrete timers".(update, more questions)What kind of timing (like how many seconds) would I get with this?Using the same stuff shown on the schematic?Also, how do I pick a transistor?Are they interchangeable? What specs should I be looking for? If this seems like too much, could someone give me a link to a site that would be willing to help with (very) beginning electronics?AND, how would you recommend making the transfer schematics for home-etched circuit boards? I can't get the component spacing right.
Topic by John Smith | last reply
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
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
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
Topic by mrshow555 | last reply
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!
Topic by oldmicah
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
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
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
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
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
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
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: http://clarkson-uk.com/555-timer/ It's actually a pretty cool program! :D
Question by tylervitale | last reply
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.
Topic by TanJ21 | last reply
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?
Topic by mrshow555 | last reply
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
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
I would like help figuring out how to make this special type of clock. I need some for my daughter, but don't want to shell out the $30 plus dollars for each one. It is basically counting down time in a visual way for children who are too young to understand numbers counting down. I know there are computer based ones online, but it is not always convenient to have the computer on. Thanks for any help! Karl
Topic by karling | last reply
I would like help figuring out how to make this special type of clock . I need some for my daughter, but don't want to shell out the $30 plus dollars for each one. It is basically counting down time in a visual way for children who are too young to understand numbers counting down. I know there are computer based ones online, but it is not always convenient to have the computer on. Thanks for any help! Karl
Topic by karling | last reply
It's a cadaver that trembles continuously. It runs on standard house current. I'd like it to tremble for only a few seconds at a time, then nothing for 10-20 seconds, then repeat.
Question | last reply
I have a timer switch from an old dead microwave oven. Can I use it as the mains timer switch? If yes, how do I connect it. The timer looks exactly like what is shown in the following picture: http://hackadaycom.files.wordpress.com/2013/09/mads-microwave-teardown1.jpg (The picture was not taken by me. It is from an article on useful things that can be harvested from dead microwave oven.) Also, if possible, please mention the functions of various pins or give a link to an explanation.
Question by raftor | last reply
Would anybody know how to make an interval timer like this one: http://www.amazon.com/gp/product/images/B004YPI5T0/ref=dp_image_0?ie=UTF8&n;=3375251&s;=sporting-goods Preferably one that doesn't cost 250$ but still is large and clean. Thanks!
Topic by datsy13 | last reply
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
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 Amazon.com 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
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
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
Topic by tscottme | last reply
Hi All: Last year I built a "glow wall" for a Halloween prop using a fluorescent black light from Wal-Mart as the light source. See the following link for the glow wall description: http://glowinc.com/glow-in-the-dark/shadow-wall.aspx This worked great! The only bad thing was sitting by the switch all night to turn the lamp on/off for the kids. This year I'd like to add timer that would turn the light on for ~30 seconds and then off for ~30 seconds. Any ideas/suggestions? Thanks for the help! amb
Question by amb | last reply
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
I am looking to add a 3 stage light timer to my shooting range at home and am wondering if anyone would know of something similar to this that has been done or possibly some help setting it up. I have seen that an Arduino may be able to do what I need? I am looking to have 3 lights, red, green, and yellow. I want the red light to be on all the time. One a button/switch is hit, the red light goes off and the green comes on for 2.5 minutes. Then the yellow light comes on for 30 seconds. Then the red comes back on until the button/switch is activated again. Any pointers or suggestions would be very helpful. Thank you.
Question by Jubaroo