Pulse circuit?

I need to make the circuit that every time it charges the capacitor to a certain voltage (e.g. 5v or 12v) it discharges it

Question by Dantex   |  last reply


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. :-)

Topic by 49percentGood   |  last reply


ElectroMagnetic Pulse Generator

Does anyone know how to make an electromagnetic pulse generator and im not talking about an EMP

Topic by cvm726   |  last reply


ESP32 and Pulse Counter

Hi.I can't find a small simple code to know if I receive pulses of a signal from an ESP32 pin.The pulses are about 100ns in amplitude and can be of variable frequency between 100 and 6000Hz.I just know if that pin is receiving pulses, I don't need to count them or anything else.Can you help me, please.Greetings

Question by apersaz   |  last reply


optical pulse oximeter

Hello everybody, I have a big problem. I want to do for the optical pulse oximeter project was a link posted here.  I need the code and the circuit diagram in there to do the project. this is an emergency. can you help me please? Can you at least provide me access to people who share the project's e-mail address? thank you and I am waiting for your help. my e-mail adress: merveebudakk@gmail.com

Topic by mervebdk   |  last reply


pulse nublers on arduino?

Hpw would you use an arduino to read a number from 1-10 (read which is high) on 10 pins then when another pin is high do the relevent humber of pulsces on another pin????

Question by jcbed   |  last reply


Lighthouse pulsing light

Hi all - I am building a wooden model lighthouse, it will stand 5 feet tall and become my driveway landmark. I have been searching for a good light circuit, a non-LED version, preferably using 120v AC. I would like the light to just do a slow flash or pulse and haven't found a circuit anywhere. I did find one SCR simple circuit using a high rated capacitor, but I am looking for more options. I have a coloured halogen which should do the job well enough. So have any of you brainiacs come across any circuits close to this description - thank you for reading / responding. Bill

Topic by bstacy37   |  last reply


Use 5sec pulse to generate only .5sec pulse ?

Hi, i use an internal relay of a phone system to open a garage door and the time of that pulse is 5sec and is the minimal time, but i need make a .5sec pulse to close, how can i use the 5sec pulse to generate another .5sec for close the door or just a momentary pulse ? Thanx !

Question by mike_k11   |  last reply


How to UV-modify the "USB fading star" instructable?

I have built sooraj619's "USB fading star"  circuit (https://www.instructables.com/id/USB-fading-star/), but with UV LED's instead of red. I hadn't thought about the fact that red LED's have a quite low voltage need (about 1,8-2 volts) compared to UV LED's (3.2v – 3.8v). But it is a problem. The UV LED's (24 pcs) aren't even close to full light intensity. They do, on the other hand, pulse in the right slow way. Does anyone know in which way the circuit could be changed to make the LED's light up properly without the LED pulsing being all disturbed? The circuit input voltage should remain 9 volts though.

Question by J.W.N.R.   |  last reply


Electromagnetic pulse generator plans?

Does anybody know where I can find plans for an electromagnetic pulse generator?

Topic by abun1991   |  last reply


How to pulse dc current? Answered

Hi! I was just wondering if people could give me some different ways to pulse dc current. I am trying to power a transformer with dc. Thank you in advanced.

Question by tesla man   |  last reply


Pulse Knex Ball Machine

This is Pulse, a Knex ball machine that I built because I was BORED AS HELL. It has two paths, and a newly-designed ball rack at the bottom of the lift. I also altered the ball claws on the chain lift. If there are a lot of requests for instructions, then I may make instructions. PICTURES: http://www.knexforum.com/members/phrasmotica/albums/pulse-knex-ball-machine/ Enjoy! -phrasmotica- Here's the video:

Topic by DELETED_phrasmotica   |  last reply


Pulse Induction metal detector ?

Hello Excuse me I want help in making Pulse Induction metal detector because I need in it in a minesweeper robot so any help Plz Thanks a lot

Question by mohamed100   |  last reply


Pulse Sensing Heart Pendant

Hey Guys, I would like to create a pendant that would light up from my heartbeat, that I could give to my girlfriend for valentines day, any idea how i could do this?

Topic by Ahren07   |  last reply


Pulse Generator, part suggestions?

Hey, I want to make an external pulse generator, mainly so I can power a simple coilgun. I know I have to have a bunch of capacitors hooked up in parallel, but what value would be ideal? And what kind of transformer do I need? Say I use a 9v battery, how would I calculate the ouptut voltage? I know trial and error would work best for me, but I don't have any transformers lying around so I need advice on which one to get. Thanks.

Topic by Jackhole   |  last reply


Rapid Pulse LED Program

Hi there! I have successfully been making some LED hula-hoops but my ultimate challenge lies before me: I want to program colour-changing LEDs so that they pulse ultra-fast and appear 'white' when at standstill but leave rainbow trails when they move. I believe it to be an optical illusion caused by the pulsing... I assume this requires a PIC program but I have no idea where to start or even if I am on the right track - does anyone out there know how I might achieve this? thanking you in advance, Amelia

Topic by funkylamb   |  last reply


Pulse detonation(numerical simulation)

Hello everyone iam a Msc student now, i have done many projects over pulsejet engines which you could see in my instructables list. Now i have decided to do a project over pulse detonation engines, before beginning with the real one i thought that making a fluent simulation will be better. I have several tries to create the detonation front and atlast i succeeded in creating one. Take a look at the attached pictures which shows the development of a detonation front inside a long tube of 100cm. Further works will be updated soon. Want to see the sequence of deto wave formation please follow the link... http://www.4shared.com/archive/a4unsF-9/sequence1tar.html?

Topic by ganuganu   |  last reply


Turn dial to generate pulses

Here is my proposal. I'm building a pan/tilt unit. I plan to have a 200 step motor attached to a 20:1 worm gear, (the latter is needed so it will 'lock' in place, and not be solely reliant on the motor's holding torque.. So in order for the output shaft to turn 180 degrees needs the worm gear to turn 10 times. In turn the motor must do 10 revs, which would need 2000 pulse steps. It's the pulse generation that's proving difficult. Whilst a 555 timer could generate pulses, I want it to be 'mechanical' For example, if I turn the knob 90 degrees, I want to create 1000 pulses, (45 degrees creates 500 pulses) and so on, so the knob matches the physical position of the camera. If I turn the knob 180 degrees in 1 second ... the motor will turn 180 degrees in 1 sec. If I turn the knob slowly, pulses will be generated slowly, and the camera/motor will turn slowly. My idea at present is some sort of optical encoder ... but that would need 4000 divisions on the wheel!! Or - a 1024ppr wheel with a 1:4 step up gearing ... but such encoders are several hunderd Pounds!! And I would need two of them!! I have software that will allow me to print an encoder wheel, but resolution will have to be 'course' since it will use an LED / transistor, so I suspect around 64 divs. I purchased a RC servo, wondering if I could remove the motor, and turn the output shaft by hand. Couldn't be done. I've also considered 'planatary gears' in reverse to 'step up' the revs ... but I cannot locate any 'hobbyist' versions other than the Tamayia type. Also briefly looked at RC servos, but having done the maths, it would be impractical to get the output to move (say) 0.1 degrees as the motor would only move about 1/4 of a rev and have no torque!! (One option may be to make it continuos rev, and place a feedback pot externally.but again, moving 0.1 degree around a pot would create minimal feedback) Incidentally, 0.1 degrees is the stepper resolution 180 degrees / 2000 steps Anyone any ideas? Bearing in mind that the speed of the pulse train is dependant on how fast the control (pot) is turned, and also matches physical camera position. Encoders are preferred option as it's then possible to electronically guage which way the motor is turning. If electronic, here is (sort of) what the circuit would need to compute. (Sample and hold?) Moved from 0 to 45 degrees in one second. That degree of movement needs 500 pulses, thus need to generate a pulse width to get 500 pulses in 1 second timescale. ** This is just to give an example. The actual sampling rate would be much faster. If it was a 'slow' 1/10th second, in the above example it would check every 4.5 degrees, and generate 50 pulses in that time scale.

Question by ChrisB1957   |  last reply


solar pulse motor help! Answered

Ok so I have two questions. First I have a very week solar panel like it can't even power a motor I can power with a AA. I would like to know how to test how much voltage it can produce. Second I'm wondering if I could use this week solar panel to charge some little capacitors which would charge up and then discharge with enough voltage to power my motor. Would this work? thanks for your help!

Question by inconceivable1   |  last reply


Waveform of pulsed magnetic fields... Answered

I have recently been astoundingly interested in magnetic fields, for seemingly no reason. The point is, that in reading up on it, and being a big fan of the greatest mind of all time, Nikola Tesla, I have been stumped with a question that I can't quite seem to answer, and can barely wrap my head around. My question is this; when one takes a normal electromagnet and sends pulses through it, is the resulting pulsing field considered to be longitudinal or transverse waves, or something else all together? This has baffled me, and I am curious to see the answer. Another question I have is, what exactly does Tesla mean by "hertzian" waves, I'm assuming that that his "non-hertzian" waves are longitudinal waves, but I could be wrong. A little background on the question... This question arose when I was looking at the 'ible "spooky tesla spirit radio"  (something along those lines, I'm not sure the exact name). I read somewhere in the comments section that Tesla found Hertzian waves to be, for lack of a better term, a waste of time. This brought the question of different waves up, and one thing led to another and here we are!! Thanks for any and all answers!!

Question by arhodes18   |  last reply


Changing DC Circuit to Pulsed DC

I am interested in changing my fixed current DC circuit to pulsed to increase the brightness of my LEDs. I really have no direction when it comes to making this pulsed circuit. I have looked into precision full wave rectifiers that I think are what I would be looking for. I am not sure what type of pulse width I would want. The one that I think would be ideal would be a Mouser DF01M, I am not sure if a pulse width of 200 microseconds is fast enough.

Topic by JimmyWatson30   |  last reply


Changing DC Circuit to Pulsed DC

I am interested in changing my fixed current DC circuit to pulsed to increase the brightness of my LEDs. I really have no direction when it comes to making this pulsed circuit. I have looked into precision full wave rectifiers that I think are what I would be looking for. I am not sure what type of pulse width I would want. The one that I think would be ideal would be a Mouser DF01M, I am not sure if a pulse width of 200 microseconds is fast enough.

Topic by MarcusJubin   |  last reply


how to make an EMP (electromagnetic pulse) ?

i want to make an EMP without (transformers , high voltage capacitors , and of course not nuclear)

Question by top.boy   |  last reply


555 1 Hz pulse generator? Answered

Hi,I have a simple buzzer which I want to convert to an oscillating buzzer so as to obtain the sound similar to that of an automobile's reverse indicator.I've posted a schematic(borrowed from electroschematics.com) below.I intent to replace the LED with my buzzer and omit the resistor.I hope by building this circuit,to make my buzzer 'buzz'(or make noise) at an interval of 1 second(since its a 1 Hz pulse generator).Would the results be similar to my needs?

Question by Adarsh_tronix   |  last reply


how to convert negative pulse to positive

Hello.. I built a transistor scr to turn on leds in my car from my remote.. my remote uses negative pulses to turn on and off... now the problem is that the scr needs a positive pulse to turn on but it uses negative to turn off,, so turning it off isn't a problem.. Im pretty sure I can just use a transistor to do this.. here is the schematic I used to build the scr...http://www.talkingelectronics.com/projects/TheTransistorAmplifier/TheTransistorAmplifier-P2.html#Latch  ... fig 75b... is there a way to modify this circuit to make the turn-on negative or just a way to use another transistor to make my negative pulse positive? I could easily use an automotive relay to do this but im trying to make this as small as possible and its still on the breadboard.. I want to get this figured out before I put it on pcb.. thanks for your help

Topic by aclark32 


Arduino crash sensor single pulse?

I'm trying to get a crash sensor to output a single 800ms pulse when depressed and held down until it is released and repeat when depressed again, I have had this working before but cant seem to achieve it again. It either continually loops while depressed or wont output at all until it's released. Any help is greatly appreciated :)

Question by KentB2   |  last reply


Arduino Reptile Pulse Proportional Thermsotat

Hi, I have kept many reptiles in the past and use this type of thermostat control with any of my non-light emitting heat sources such as ceramics, heat mats etc but these thermostats are pricey for every setup. An idea I had was to maybe incorporate an Arduino since I have one lying round to be able to control multiple input/outputs for more than one tank, but i do not know how to go about building one and what pulse proportional means. I have used Arduino before and familiar with C programming but not done much with controlling AC electrics other than either on/off using relays (ideal for simple thermostats tho like MatStats from livingearth). So would it be as easy as to find a PWM AC controller and make the Arduino change the duty cycle depending on how close the temperature actually is compared to the set point? Or would I need to use PID control? Any ideas would be great. 

Topic by rowly747   |  last reply


Need a clock pulse switch circuit!

I cannot not for the life of me figure out how to make this circuit.  The circuit needs to do this: I push a button that sends a single signal to the circuit.  With each push of the button the circuit activates a seperate relay in sequence.  I need 6 relays to activate with 6 button pushes in sequence.  I know this is a very simple circuit to design.  I just can't figure it out nor find out how to make it. I'm not sure what the voltage of the relays coil should be.  My goal is to make bottle rockets launch off of my RC helicopter.  I'm going to use a 9vdc power source, a couple capacitors and some nichrome wire.  The relays are there so that each rocket launches seperately.  Hense the need for the circuit.   So with each push of the button on the transmitter...a seperate rocket is fired.  Thanks for any help ya'll.

Topic by rock0nman   |  last reply


Powerful Pulse laser using capacitors.

Ok, i'm relatively new to electronics, but i've made a few projects and would like to try something more challenging. i've seen KipKays tutorials for making burning lasers and it got me thinking: instead of using a laser that's constantly on, why not charge up a medium bank of capacitors and use them to fire the laser for a micro second. surely this would mean that more power could be outputted while still powering it from a battery. there's probably something i don't undertand that would made this impractical, but i won't know until i ask. thanks in advance.

Question by DrVonTrap   |  last reply


what is the capacitor code?

I have a green capacitor that has the code, .22k 100sc What is the value in uf?

Question by madman11   |  last reply


Pulse jet cogeneration either hydrogen generator or steam turbine?

I wanted to make a pulse jet and use peltiers to generate electricity to create hydrogen that will be added to the pulse jet. That or i'd run water around the metal of the pulse jet to cool it down and produce steam that could drive a turbine. Give me suggestions and any flaws in my idea. Thanks

Question by Aron313   |  last reply


how do I make a pulse jet engine with 100 pounds of thrust?

I want to make a pulse jet which will produce about 100 pounds of thrust.

Question by    |  last reply



How do i make pulsed dc?

I just make shocker from 9 volt battery,but it's use transformer so it's must be pulsed,can i make it with transistor? Don't tell me if using 555 timer,because it's very hard to find 555 timer,Thank you...

Question by mismail15   |  last reply


How to control the laser pulse using audio?

Well, what i wanna do is to control the laser pulse for my lasershow i built. I would like to make the laser PULSE using a tone generator program i have here.

Question by belgvr   |  last reply


single pulse input, permanent dc output ?

I need to glow a LED permanently on 5v single pulse as input  till it is reset manually, what circuit should i use? For project work? Please help.

Question by AjayG28   |  last reply


Does anyone have a "Instructable" for a Pulse Jet?

I'm looking for a simple tube/pipe Pulse Jet to build.

Question by MK1Jack   |  last reply


convert negative pulse into positive using a transistor?

Hello... ive built an scr using transistors to turn on leds in my car with my remote.. my remote uses negative pulse.. now the scr(latching transistor) that ive built turns on with a positive pulse and off with negative.. so turning it off is not a problem.. I need to change the negative turn on pulse to positive to turn it on though. I know theres a simple way using a transistor to do this, but im still learning and my knowledge of transistors is still limited.. here is the schematic I used.. figure 75 b. I followed the schematic and it works just fine..http://www.talkingelectronics.com/projects/TheTransistorAmplifier/TheTransistorAmplifier-P2.html#Latch  ... thanks for helping me out here

Question by aclark32   |  last reply


Short range radio pulse transmitter design?

I need something simple to transmit pulses 2-3 meters to a receiver The transmitter will output a pulse every few seconds, transmit a small burst at X frequency. The receiver then outputs a short high pulse/outputs high for the duration of the received pulse. I want this to be as simple as it can possibly be, cost being the primary restriction and power usage being also of fairly high importance, so please no suggestions of Bluetooth or xbee type systems. It does not have to be a radio based system, however it needs to work without line of sight and of course without connecting wires. If it helps the overall aim is a 'safety signal' that will set of an alarm at the receiving end if several pulses are missed Anyone? EDIT: To clarify I am looking for simple, like really simple. So the transmitter is just a resonator and antenna. What I need is a simple receiver that will respond to a specific frequency, on or off. Does such a thing exist? 

Question by Damp Cuttlefish   |  last reply


What is the best design for an electromagnet in a pulse engine?

I am a complete bigger to all magnets, electromagnets, and electronics in general. Recently I've had an interested in different electric motors and have been looking into trying to make a pulse motor that is both efficient and powerful. To do this I want to be able to have the best arrangement of the magnetic fields of the neodymium magnets on the spinning disk and the electromagnets on the outside. I started playing around with the magnetic calculator found on https://www.kjmagnetics.com/calculator.asp but I don't really know what I'm looking at, just that different shapes and sizes have different fields and strengths.  Since a pulse motor is built by using an electromagnet to repel a neodymium magnet, what would be the best design for a strong burst electromagnet in the direction it's repelling the neodymium magnet? Also, what would be the best shape for the magnet to have the biggest repelling effect from the pulsing electromagnets? 

Question by AlanR18 


How does one-pulse circuitry work? Answered

Forgive my ignorance on the actual name of these circuits. The circuits I am talking about are those that receive one momentary signal, and then perform a whole series of tasks, without the use of a microcontroller. Thanks!

Question by mad magoo   |  last reply


Does the skin effect apply to pulsed DC? Answered

I am building a DC Tesla coil and I want to know if my primary coil will still need to have thick wires or tubing if the skin effect doesn't apply to DC electricity?

Question by The MadScientist   |  last reply


for a jam jar pulse jet what percentage dopes the methylated spirits have to be?

. I've ordered some at 10% is this enough?

Question by jibatsu   |  last reply


Get electromagnetic pulses from a gas igniter

Hi, here I have a common gas igniter like this: http://s10.postimg.org/r55cvgt9l/gasigniter.jpg Well, I removed the circuit from the box, then I shorted the two terminals, using various kind of coils (thick wire, thin wire, in various configurations and with different turns), but seems that this circuit is unable to generate electromagnetic pulses; I've tried to turn on a fluorescent lamp, to cause interferences to a pocket calculator (as I can see in various videos on youtube), but nothing happens. If I remove the coil from the terminals I am able to get nice sparks. So, why this circuit won't work as expected? I miss something? However this is the circuit: http://s4.postimg.org/fgd78werx/ignitercircuit.jpg Please note that I'm aware of the fact that these kind of circuit could be dangerous; I'm taking all possible precautions (I'm using it far from any electrical device, I'm using isolated gloves, and so on). I just want to make this circuit for fun. Many thanks.

Topic by akopelumenuscu   |  last reply


Coin Acceptor Pulse to Android App via Bluetooth Module?

Good Day, I'm new in Android and Arduino Programming. Does anyone here have an Idea how to send coinslot pulse to android app via bluetooth. The Coinslot is connected to an Arduino with Bluetooth module. and will send pulses to android app if coin is accepted. any help will be greatly appreciated. much better if with example codes. Its for school project.  godbless.

Question by DJGETZ   |  last reply


How do i eletronicle generate a 12v ac pulse to mimic a starter coil if a motorcycle

How do i eletronicle generate a 12v ac pulse to mimic a starter coil if a motorcycle

Question by ccook9555   |  last reply


How to convert a standard video monitor to a pulse-cross monitor?

For video diagnostics, a wave-form monitor and a pulse-cross monitor are highly useful tools. Is there a simple way to convert a standard video monitor into a pulse-cross (sometimes called a cross-pulse) monitor? I.e., feed the signal into a box and the box feeds into a standard video monitor and you can see the normally invisible image corners and invisible vertical interval of the video. I think this can be a simple electronics diagram. Thanks for any help!

Question by LightSpeed1   |  last reply


how to generate signals arduino? Answered

  uhi i want to generate 3 equal variable pulse high with constant pulse low signal that vary with potentiometer and asume it repeat it self every  10us and pulse min is constant 2u and pulse high vary betwwen 5-8u and i want it to carried at specific frequency? i attach the signal i want to generatel 

Question by britich   |  last reply


Controlling two servos with one pin and a NOT-gate

Here's an interesting idea. It may be possible to control two servos independently with only one output pin and an inverter/NOT-gate. Normally, a servo is at its 'center' position when a pulse is 1.5 ms & its angle (or speed for continuous servos) is based on the difference between the length of time of the pulse it received & the base-time of 1.5ms. The servo itself does not react to the time BETWEEN pulses however. If the signal was inverted, the result would be a pulse with a time being that of the time between pulses of the initial signal. If the width of a pulse and the time between pulses can be independently controlled, then it would be possible to control one servo with the signal directly, and another servo using the inverted signal. I found something similar here [http://www.diyrc.com/reversers.htm] but it seems to be intended for 'reversing' the signal used to control one of the servos.

Topic by Michael_Everett_Feder   |  last reply


The Pulse Jet Bicycle that Goes up to 75 mph

Pulse jets are fun to watch and you can get an intro to making one with a jam jar. Make a big one and it can be incredibly freakin' loud. Mount it onto a bicycle like Robert Maddox did and you'll get speeds up to 75 mph as you blast your ears into loose bits of jelly. Link

Topic by fungus amungus   |  last reply