Hi i have square wave start 5 then 0 picture 1with variable duty cycle i want to convert it to the signal in picture2i did integration in picture 3 but didnt invert the signal .
Asked by britich 5 years ago | last reply 5 years ago
We have a satelite dish on the roof for sending and receiving email. It is called Surfbeam . How can we use the computer to check our signal strength. Our house is settling and they want $100. to send a man up with a meter he uses on the roof. How can we do it. We have electronic knowlege and am an Amature Radio Operator. Please help
Asked by emit 9 years ago | last reply 3 years ago
I'm trying to make a simple transmitter/receiver setup to use in airsoft to keep track of the distance (not worried about direction right now) between me and whatever the transmitter is planted on. The transmitter can send out a steady signal or pulses, and the only problem I have is how it will show the distance. I have a line of LEDs that I want to set up so that more light up the closer I get to the transmitter, but I don't know how to rig the setup so that it displays signal strength (I would think that the closer you are the stronger the signal). Does anyone have any idea how I can do this or perhaps better alternatives that accomplish the same thing?
Asked by pyrorower 8 years ago | last reply 8 years ago
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
Asked by britich 5 years ago | last reply 5 years ago
For a part of a project on Power theft detection on a cable, i needed a way to inject a signal on a cable. Can anyone please suggest a method inject the signal. The signal is a pulse generated by a function generator.
Posted by killswitch123 7 years ago | last reply 7 years ago
I have toyed around with the idea of making a jacket that has the turn signals and/or brake lights on the back. However, there is a twist, I would like to see a controller box to wirelessly send the signal from a scooter to the jacket. When the turn signals and brakes are used on the scooter it sends a wireless signal to the controller in the jacket which relays that to lights on the back of the jacket. I've seen some jackets with lights wired on to them controlled with an arduino.
Posted by partyone 9 years ago | last reply 9 years ago
Hi community, i would really make a robot that follows a signal maybe wifi signal the idea is to keep a small chip (transmitter) in my pocket and the receiver would be installed on the robot body or the reverse, so the robot would follow the signal, and im really thinking to use a tank body ( not wheels) with two motors that will drive body just as a tank or Caterpillar digger concept So can the community experts help me how can i realize my dream, and tell me what could be the parts and how it would work?? Thank you so much community you have been always helpful !
Asked by vwtm2006 4 years ago | last reply 2 years ago
I was trying to figure out how to boast my signal coverage in my area, and a got an idea: to use a UHF amplifier, to pick up the towers signal and rebroadcast it. of coarse since things like WiFi, Bluetooth, and cellular 2G/3G/4G networks use two way radio, the signal can go back to the reviving end of the UHF amp, and get broadcasting to hit whatever tower. my phone should better recognize the tower, as if i just magically made a tower 2 feet away. however this might also amplify stay noise. if this idea doesn't work, why not? i think i am going to need at least a 20dB increase in power, but as of now i need to do more research. but if i can buy a product that does a similar thing for less than $40, i would. http://en.wikipedia.org/wiki/Dead_zone_(cell_phone)#Dead_zones http://en.wikipedia.org/wiki/Repeater http://en.wikipedia.org/wiki/Wireless_spectrum (cellphones use UHF spectrum) http://en.wikipedia.org/wiki/Signal_booster
Asked by -max- 6 years ago | last reply 2 years ago
How would I go about creating an amplifier using an LM741 to amplify a 0mv-400mv signal to a 0v-4v signal? All the circuits from google or textbooks don't work, or produce strange oscillations. The only way I can get it to work is in inverting mode, where I can get -4v-0v out, which isn't very useful. My specific application for this is for a digital thermometer. I intend to amplify the 0-400mv analogue signal from an LM35 linear temperature sensor, then somehow sample that without using loads of logic or transistors and convert it to decimal or binary, then drive a dual 7-segment display to show the temperature. I have a prototype made using 20 comparators and 10 xor gates, and countless diodes, so if anyone could advise me on an easier way to do that, that would be great. And no PICs/AVRs, I know how to use them and have programmers, but I prefer to do "real" electronics using CMOS chips.
Asked by andy70707 7 years ago | last reply 7 years ago
Daniel Schulze is an industrial design student in Berlin who is working on a sweet smoke machine. The plan is to have a 7x7 grid of holes that shoot little clouds of smoke into the air. The smoke comes from a fog machine and is shot up in the air with drivers. Check out the video below to see a test of one row. The full setup will be shown next week at DMY Berlin. A Modern Take on Smoke Signals: "For Those Who Can See" via engadget
Posted by fungus amungus 8 years ago | last reply 8 years ago
Sir please tell me any method to hack signals of tv cabel wire nearly passing. i mean some method of making antenna which can catch signals of nearly passing tv cable or a method of making a booster who can do so or some other trick to do so. thanks.
Asked by asadriaz 6 years ago
Hi, I have a Yaggi style tv aerial (vertical polarisation, wideband) in the loft I pick up the main signals from a sub-transmitter (forgotten the right word) to the front of the aerial - good reception. I receive some weak signals, depending upon the weather conditions, from the main transmitter at the rear of the aerial. I receive these signals by reflections from the landscape, etc. I am thinking of attempting to boost the reception from the rear by placing horizontal directors alongside the vertical directors. Do you think this idea will increase, decrease, or make little difference to the reflected/direct receptions. Thanks A PS. Before you ask, Yes I have tried pointing the aerial towards the main transmitter, but I get no signals, due to geographical considerations. I get better reception from the main transmitter when the aerial points 90 degreesaway from it.
Posted by anon_private 4 years ago
I drive allot for work, I see people endangering me and everyone they share the road with concealing their intentions to turn or change lanes. Most people I see just slamming on the brakes and turning are younger drivers who I suppose have not developed enough brain power to use the highly complicated device known as the turn signal. Others are just lazy and don't care if they get side swiped. I know its hard people but get your knuckles off the ground and check your blind spot and use your turn signals....
Asked by nickademuss 9 years ago | last reply 8 years ago
Hi, I'm having a project which need to send trigger signal to oscilloscope. i should make a circuit that will allow me to trigger oscilloscope on specific lines in a video signal. Please give me some idea so i can go ahead. thanks in advance
Posted by sofia14 3 years ago
I want to know if there is any 'mobile phone signal detector' already available in the market. The purpose is to find if anybody is using mobile phone for calls or messaging at restricted places. Jammers are not fine as some are exempted from making calls etc.. If there is nothing like that available, how to make one to detect the signal or even the phone from which the signal was emitted. Usually when we are about to receive a call or sms and if we are near a Speaker we get a specific noise through speaker, or if we are near a monitor (CRT) it flickers. So I am sure there are ways to find this signal emission. Please suggest the options to do this....
Posted by donjoy 7 years ago | last reply 6 years ago
Hi, I opened up the remote controls of my old alarm system ( those reed switch ones) hoping to find some IR LEDs. But I got this instead, no IR LEDs. Can anyone tell me which component is sending out the signals ? Thanks in advance.
Asked by fujiapple 9 years ago | last reply 9 years ago
Looks like Leah Buechley has been busy making even more Turn Signal Bike Jackets. From her Flickr post: on the steps of Shih Chien U, prototyped by me w/ parts from the taipei electronics markets & made by (awesome) Shih Chien University fashion students via CRAFT
Posted by fungus amungus 9 years ago | last reply 8 years ago
Hey guys gotta quick question: I need to be able to cut a PWM signal from a motor for a project. I'm currently using mechanical relays but I'm curious, will a solid state relay work? I know there are easier ways to do this but for right now I'm on a clock and I just want to know whether a SSR will work for cutting a PWM signal. Thanks guys!
Posted by HavocRC 1 year ago | last reply 1 year ago
Imagine I have a very short signal that I would like to observe, however the frequency is too high for simply viewing it on an oscilloscope. Is there any possible way to "dilate" it over time? Obviously, I am not talking anything digital, probably some crystal retranslation... Somehow, I haven't managed to find anything using the most obvious way (googling), but, probably, I don't know how to.
Asked by gruffalo child 5 years ago | last reply 5 years ago
Now, we have long been told that cellphone signals can cause or trigger brain tumor and its pretty much fallen on deaf ears because we cant possibly disconnect ourselves from the cell phones and mobile devices. But is it true that you can prevent them from boosting the cell phone signal like this article states.
Asked by sanejan 9 years ago | last reply 9 years ago
I have a 1966 VW Baja bug thats converted to 12v & I want to be able to run 2" round (trailer lights) as my signals. I hooked them up but they dont even light up. I know they work because I pulled them & tested each one. I also know there is power to them & a good ground, as I tested that too. Im just unsure what I need to change next. (the stock signal relay has 4 wires coming off of it & works if I plug in stock type signals) I tryed reading several led post's here & am still lost. Any help would be greatly appriciated.
Asked by airdreams1 9 years ago | last reply 9 years ago
I a robot i am building, i need to condition the signal as follows with any Microcontroller, only logic gates If 1 is high then A & C should be high If 2 is high then B & D should be high If 3 is high then A & D should be high If 4 is high then B & C should be high Where 1,2,3&4 are inputs and A,B,C,D are outputs No two inputs will be high a t the same time
Asked by qwerty156 7 years ago | last reply 7 years ago
Hi everyone,I just wanted to know how I can send a small electric signal over a distance(not more than 10 meters)wirelessly and receive it at the other end to trigger a relay which in turn of course.. switch higher voltages and do something say...light a LED.I don't know much about frequencies,oscillators and FM/AM or anything.So please let me know how I can get an idea about these and most importantly accomplish what I just mentioned above.
Asked by Adarsh_tronix 5 years ago | last reply 5 years ago
I want to make a simple wireless transmitter that can be used for a signal line for a project. I technically want to push a button at one end, and at the other end have it so it is like the button was pressed there. I would like it to have a range of about 30 yards (preferably without going over government limits)... Could i do this with just a transmitter and receiver?? Where could i get them (i have an order at digikey, so if there were a way i could get them and add to my order it would be great)? Any ideas? Thanks! :)
Asked by astroboy907 8 years ago | last reply 8 years ago
Hi, I need to make a sawtooth generator based on an NE555 (the power supply will be 15 volt - 5000mA), and I need to boost the output signal as follow: http://s21.postimg.org/dwz6aynvb/Sawtooth.png Which needs to go from 9.6 volt to 14.10 volt with a 3000mA current. I've found a schematich, but I don't know if is valid: http://s27.postimg.org/9ptmbsbkz/Signal_Boost.png Would be a viable way, using this schematic, or there would be a better/different solution? If so, someone could suggest me another schematic or tell me how to modify the one which I posted? Thank you.
Asked by akopelumenuscu 3 years ago | last reply 3 years ago
I have created a circuit using the diagram found here: The only differences in my circuit are that I only have used one LED and one 3 volt coin battery. I want to install this circuit in my headphones with the L/R and Ground soldered to the terminals of the speakers. On testing the circuit, I found that the light is only clearly illuminated when the volume is set to max, otherwise, it is very faint. I want it to work at lower volumes. How do I amplify the signal going to this circuit without building a headphone amp? I only want to amplify the signal going to this circuit, not the headphones. Thanks in advance.
Asked by Vijster1 6 years ago | last reply 5 years ago
Hi I'm doing some experiments with an fm transmitter. Now, instead of transmitting and modulating audio, I wanna try to feed the base of transistor using a ramp generated by a NE555. I ended up with this schematic http://s30.postimg.org/pbe0oyu4x/base_sawtooth_modulation.png , would be ok to pass the signal on the base using a 220 ohm resistor and a 10nF capacitor? I suspect that I have to increase the value of the resistor R5. kind regards.
Asked by akopelumenuscu 3 years ago | last reply 3 years ago
I know a guy who knows a guy (I know, cliche) who was able to combine a cantenna, a lunchbox, and a small monitor, (and some other stuff) and when they stopped at a red light, MacGyver was able to display the image from the camera on the screen. Basically, they were looking at themselves from the point of view of the traffic camera. So, my question is, how easy would this be to do? I'm guessing the right software on a *laptop with a wifi card would suffice. What does everyone else think? *Edited
Posted by NozeDive 9 years ago | last reply 9 years ago
I try to configure a tv / video card on my computer to display input from composite video (yellow plug) input when i choose any of the inputs i still have to set the frequency (above). it should be some fixed standard frequency. what is it for pal b/g ?
Posted by 11010010110 10 years ago | last reply 10 years ago
I have an idea for a small leather work project that would utilize mylar film as an RFID signal blocker. I have tried to research the effectiveness of mylar film for this purpose and the consensus opinion seems to be a resounding "Yes, No and Maybe." If anyone can point me to an authoritative source or has personal information relating to this, I would be most appreciative. Thanks Addendum: Much as I anticipated, you have posted a host of excellent answers that gave me a lot of information I hadn't yet considered. For my part, I should have included more information concerning my project in my question. The Skinnerz response reminded me that I have some scraps of fine mesh stainless steel screen termite shield and I will give that a try rather than mylar for my wallet and passport case.
Asked by Burf 7 years ago | last reply 7 years ago
I recently bought the C. Crane FM transmitter. I have not had much luck with it even after turning up the pot as described on the internet. However, I am not giving up yet. Below are some possible things that I have thought of to improve the sound quality of the radio at a distance from the transmitter. 1. run wire from the antenna of the FM transmitter to the ductwork in my house. I already tried this. I had better luck attaching the wire to the exterior of the ductwork in my basement rather than the interior of the ductwork. 2. create some sort of repeater(s) to get around walls. This device would have to be a receiver/transmitter. 3. create my own FM transmitter with the best parts that I can find. 4. Use a homeplug system. Your suggestions are much appreciated. I don't know a darn thing about electronics so if you have any recommendations for good books that would be nice.
Posted by sundet 11 years ago | last reply 11 years ago
Dear Instructables.com: Look, I respect Instructables.com's right to make a buck as much as that of any other site that proffers user-supplied content, so please don't misunderstand this comment. I'm not decrying the presence of ads on Instructables.com. I'm bothered nonetheless. Until recently, when I landed on the Instructables.com home page, I would see two columns of fascinating, deliciously creative projects. When I visit the site now, I find that the page is dominated by ads. Dominated? Yes. Now I have to scroll before I see *any* actual Instructables. Now in the interests of full disclosure, I'll confess that I've got a mere 800 pixels of vertical resolution to work with, but come on folks, no Instrucables above the fold? Really? And I've noticed with some dismay a growing number of featured projects from external commercial sources like This Old House (of which I am a *huge* fan, btw). I'm not calling for a moratorium on ads on Instructables, or anything absurd like that, but I do feel that the kind of projects that make this site truly great (those from individual makers, crafters, and builders) is beginning to get crowded out. Keep the ads, by all means, but please keep the spirit of personal creativity in focus as this amazing site evolves. Thank you.
Posted by jdtwelve12 8 years ago | last reply 8 years ago
I don't know much about radio waves and oscillator circuits , AM/FM and stuff, but I need to send just electrical signals wirelessly, without any information on it, to some other device which activates when it would detect the signals. I would prefer to make the devices myself, if it is possible, without needing to buy anything, like RF oscillators and other stuff. I was told that whenever electricity passes through a wire, a radio wave is emitted outwards from the wire, and is emitted every time the current flow stops, starts or changes direction, I was also told that whenever a radio wave crosses a wire, it induces a very small current in it. I don't know if whether the above information was correct or not but I think I can use it in making such a device.
Asked by Wisaam 5 years ago | last reply 5 years ago
I am trying to install an in line signal amplifier for my satellite, which I hope will increase the signal strength. However, when I finish installing the amplifier the signal is totally blocked. Dose anyone have any ideas on what I am doing wrong?
Posted by Sedgewick17 10 years ago | last reply 10 years ago
I live in an area with really poor cell signal. If I stand in one spot with one leg up I can sometimes get a signal. Of course it is outside the house. Is there a way to build a cell signal booster cheap? email@example.com
Asked by awelch 9 years ago | last reply 4 years ago
Hello I have been thinking about a project that I would like to try. The idea is that I would like to be able to take the signal from my bass guitar and split it in two (configurable how much signal in each, but the sum should be 100%), apply an effect to one of the lines and then combining the two signals again having only applied the effect to some of the signal while carrying the clean signal through. This way I could apply e.g. distortion to only 20% of the signal. I thought that I could control the volume simply by putting an resistor in the signal line, but this gave quite some noise. This is my first attempt at building electronics for instruments, but have some experience with electronics in general. Hope you can help me with a couple of questions: 1) Shouldn't you be able to lower the signal simply by resistors? Should you use any specific resistors for audio? 2) Is it possible to recombine two audio signals and can you just put the wires together? Kind Regards Brian
Posted by FatMooseHenry 6 years ago | last reply 4 years ago
I am given to understand that the length of an antenna is proportional to the wavelength of the signal that is fed to it (a quarter wavelength, for example). In the case of a signal modulated by amplitude, the frequency (and therefore wavelength) of the carrier wave remains unchanged. However, in the case of a signal modulated by frequency, the signal fed to the antenna will vary in frequency (and, therefore, wavelength). My query is this : how would one go about calculating the length of an antenna for a frequency modulated signal? Its frequency is not constant, so to construct an antenna of say, a quarter of the wavelength, would be impossible. I thank you in advance for your assistance. AlexHalford
Asked by alexhalford 9 years ago | last reply 9 years ago
My younger brother always having problems with incoming SMS, door bells. Saw some signaler sold online but it is indeed will cost a Benjamin. Anyone could have a DIY signaler to lit series of colorful LEDs when there is an incoming SMS, or incoming cell phone if the phone is rest onto the signaler ? I remembered last time during the 2G phone era, it used to have these tiny gadget attached at the antenna and will emits light when there is an incoming message or incoming call. Unfortunately it is no longer available these days.
Asked by s3ngchoy 6 years ago | last reply 3 years ago
I was thinking of trying a project in which I do a custom watercooling setup on a gaming laptop of some kind. I would like the loop to power on and off with the laptop itself, but I don't want to use USB power or something like. That made me wonder if laptops have a power on signal, like desktop psu's have. Do they have it or something similar to a power on signal?
Posted by Dashing Rainbow Dash 2 years ago | last reply 2 years ago
I am trying to figure out how to control a device that will be "off" while in the range of a transmitter (short range...under 10ft) and then turn on when it goes beyond the range of the signal. I would also like it to be an adjustable range. I was thinking the device would be "on" constantly as the transmitter tells it not to activate, but once it leaves the signal range it would activate. Any thoughts? Thank you in advance.
Posted by milkyway312 4 years ago | last reply 4 years ago
Hi, I am creating a VU meter with my arduino board soon. I would like the vu meter to output the same amount of light even if the input audio is lower or giher (if i change the volume, I dont want the vu meters range to fluctuate). Does anyone know of a device that will maintain a constant signal voltage regardless of whether the inout signal is high or low? I'm not fussed if this amplifying circuit distorts the signal a bit as I am not actually using it to listen to afterwards. Thanks, Joe
Asked by joearkay 7 years ago | last reply 7 years ago
On the top floor of my room, i have enough range for my mobile. but on my ground floor, the coverage is very low. my cell phone network is bsnl. is there any way to capture that signal, boost it and transmit the signal inside the entire house?? if we can successfully make a device or a circuit for this then it will be a very usefull work for all.. thanx in advans!! :)
Asked by allsparkunleashed 6 years ago | last reply 6 years ago