Trying to build a square wave generator (high frequency) and H-bridge

Hi, I was wondering if someone could help me out at building a high frequency variable square wave generator. Specs: 100kHz - 1Mhz (better if I can get up to 3Mhz), 5 to 20V, square wave. Right now I have a LM555 timer. I have read online that I can get it to run at maximum 1Mhz. I don't know what I'm doing wrong, but I can't get it to output at higher frequencies. Also, does anyone know of a good H-bridge circuit schematic that could output 24V pk-pk at 3A. I will be using the signal from the square wave generator to feed to the H-bridge, therefore, is there a H-bridge design that can handle high frequencies? Or, is there another driver circuit that I could use instead of a H-bridge that could do the same job or better?

Posted by sonny301 10 years ago


Bridge Launching Lego Robot

This bridge launching robot by Flickr user Mahjqa is fantastic! The curled up bridge on its back is extended out up to 48cm (19 inches) over a gap before the robot  disengages from it so it may drive across. On the other side it can turn around and pick it back up! [Youtube via Gizmodo]

Posted by Jayefuu 8 years ago


Adjustable Bridge

I have an Epiphone acoustic guitar that I really like, my girlfriend gifted it to me after her uncle gifted it to her (she doesn't play, fingers are too small). It's the FT-130. It basically has two large screws, one on either side of the bridge, If anyone is familiar with this style of adjustable bridge can you please either tell me how to use it or send me a link to a site that will? the action is pretty low on the high strings and I'm getting a lot of buzzing (more than I should). Thanks for any help you can give!

Posted by HAL 9000 10 years ago


Odd Breadboard Question

Hi All  I am brand new to hobby electronics and would love one day to be able to create the endless amount of cool Instructables but I have ran into a problem on my first attempt at putting theory into practice and would really appreciate any help. I have made two diagrams / images showing the circuit I made I have attached them to this post. I am using an Arduino Uno as a power source.... I ran a 5v positive from the 5v pin on the Arduino using solid core jumper to the top of the breadboard onto the positive row / rail and a negative / ground jumper to the bottom of the breadboard. In the middle of the breadboard I placed a 1k ohms resistor bridging the gap / grove/ divide and ran the positive feed through it and on to the anode leg of the LED. The cathode leg of the LED was connected to the negative row / rail completing the circuit. All works as it should because of the high resistance from the resistor the LED barely lights and is green as it should be. So without using a multimeter I know and can see the resistor is clearly working. However if I move the resistor so it's still on the same line / row as it was but no longer bridging the gap the LED goes super bright and turns yellow which means that the resistor is no longer working which I can't figure out why because I know there is definitely current flowing through it given the extreme reaction of the LED. I vaguely remember reading somewhere on these forums that Fritzing is not liked very much so I hope no one minds but to help explain what I mean above I have created two diagrams / pictures using Fritzing. The images diagrams shows the resistor "bridging" and working and the other shows it not bridging and therefore not working. So my question would be why given the resistor has current flowing through it does it not work unless it's bridging this middle divide / gap / grove? It makes me think I am missing something really stupid that everyone should know about breadboards but just seems really odd to me. Many Thanks Rab

Posted by belfastrab 3 years ago


Sitar bridge mod (for floating-tailpiece guitars) idea

The characteristic sound of a sitar is created by a bridge that gently rolls away from the strings; this creates a buzzing timbre which quickly depletes higher overtones in the string's vibration (I could draw some diagrams if anyone's interested). This type of bridge is something I'd like to make as a removable modification for a guitar. My guitar has a "floating tailpiece" as I believe it's called, in which the strings pass beyond the bridge to the tailpiece. The segment of the strings below the bridge have no part in tone generation, and so could have an object attached to them (a piece of wood wedged between the strings, perhaps) without affecting the guitar's tone. If some object (the "clamp") were attached to the strings immediately below the bridge, another object (the "sitar bridge") could be affixed to it some minuscule distance from the vibrating portion of the strings. The sitar bridge would not make contact with the strings at rest, and so would not be a node of vibration (and not affect the strings' pitch), but when the strings are played, their vibrations would make them rattle against the sitar bridge - much like the bridge of an actual sitar. So how about it? I think it'd be an interesting and relatively simple mod that could be made to be removable and not destructive at all to the actual guitar. I unfortunately have no idea how to refine the concept any further than what's written, so I leave it up to any willing DIY-ers. It all makes sense in my head, but I may have accidentally left out some important particulars of this kind of mod, so please ask any questions you have. Because this mod relies on the strings below the bridge in a floating tailpiece guitar, I don't think it would work on most solid-bodied guitars, but if anyone can come up with a similar mod for the more common bridge type, be my guest. Also remember that the "clamp" below the bridge cannot rely on the tensile strength of the strings, as not only are they not terribly strong, their tension needs to remain intact so that the guitar can be played in tune.

Posted by Impasse 8 years ago


Water Bridge

I was reading this article on how scientist made a bridge out of water, just liquid water, using a high voltage of electricity. They flipped the switch and the water from one glass(well i'm not sure what they put it in, i am assuming a glass beaker) over the very air between the beakers and into the other glass, held up by nothing at all. You won't be driving cars across this thing anytime soon, they biggest they could make it span was 25mm. Supposedly the current restructured the water molecules to create it. I do know they used DC current though. Also the bridge only last for 45 minutes, because of heat, which as the article states, it went from 20(degrees) C to more than 60(degrees)CQuoted from the article,http://www.physorg.com/news110191847.html)Upon investigating the phenomenon, the scientists found that water was being transported from one beaker to another, usually from the anode beaker to the cathode beaker. The cylindrical water bridge, with a diameter of 1-3 mm, could remain intact when the beakers were pulled apart at a distance of up to 25 mm.I'm not sure how much current was going threw them but I would be amazed and appreciate it if someone could find out, experimenting or however they could.

Posted by cd41 9 years ago


Enforcing polarity with an AC adapter?

Several months ago, I posted an I'ble for adding an AC adapter to something. The adapter I chose, from Radio Shack, is actually a two-piece "kit" -- the wall wart cord ends in a generic two-pin female jack, and they sell a bunch of different end plugs. The jack is symmetric, so that the end plug can be put on with either ground or hot on the outside.I've just realized that this could be a problem. If the electronic device expects red to be positive and black negative, then putting the jack on backwards would be equivalent to installing all the batteries the wrong-way about. Not a great feature.To "protect" the device, I'm considering adding a diode bridge to ensure that the internal "red wire" always carries the positive, and the "black wire" is always ground. Do more experienced folks consider this a good idea? Is it necessary? Would it be better, perhaps, to just epoxy the end plug so it can't be reversed?

Posted by kelseymh 9 years ago


What is Bridging?

I'm new to Intructables and new to electronics and i'm curious of what bridging is? lol

Posted by Ziegbod 11 years ago


Friend's new website

My friend just made a new website. It is for Lego lovers. Check it out . it has tons of neat pics. Here's the link http://www.legoka.weebly.com

Posted by bumboozer 8 years ago


Model bridge

Hello,             What is the best way to construct a model bridge out of small wooden icecream sticks  The requirements are as follows: 1) the icecream stick dimensions are 2mm deep 10mm wide by 115mm long 2) the bridge has to be 1 metre long and about 20-30cm wide 3) the only materials are the wooden icecream sticks , wood glue and cardboard to form the deck of the bridge. The idea is to construct the bridge so as to be able to hold the most weight.The most weight achieved so far is 450 kg before breaking

Posted by jamesk891 4 years ago


Giant crane arrives to help build new bay bridge

A 328 foot crane built by ZPMC near Shanghei, China capable of lifting 1800 tons at a time was brought into the Port of Oakland two weeks ago aboard a partially submersible transport ship. It is the largest marine crane to ever work on the west coast.I had been noticing the absolutely massive red white and blue crane on my commute over the bridge to work for a few days, but was unable to find any info on it. Thankfully a project associate from the Public Information Office of the San Francisco-Oakland Bay Bridge Seismic Safety Retrofit Projects was nice enough to email me back about my query with the relevant info. From there, it was easy to pick up the internet news trail.SF Gate Article - One big crane, coming upThe San Francisco Oakland Bay Bridge Project

Posted by noahw 9 years ago


SketchUp Competition: Design a bridge and win $5k

Have some SketchUp skills or at least have a good eye for a bridge? Then check out this SketchUp contest where you need to submit a killer bridge design that's open to students and top prizes are $5,000, $2,500, and $1,000.Don't worry about knowing how to use SketchUp. It's easy to learn if you follow the tutorials. Are you in awe of the engineering that goes into designing a bridge? Do you have a favorite local, famous, or historical bridge you'd like to see in Google Earth? Now you have a chance to show off your modeling skills and make that dream a reality by entering the Google SketchUp International 2009 Student Bridge Modeling Competition. Simply model the bridges of your choice in Google SketchUp, geo-reference them in Google Earth and submit them by uploading to the Google 3D Warehouse to earn lasting online glory and, for the winners, a handsome prize. Link via Make blog

Posted by fungus amungus 9 years ago


xbox 360 problem

Ok see im trying to bridge a connection between my laptop and my xbox 36o to play on live, and when i bridge them , it says, " To create a network bridge, you must select at least 2 lan or high speed that are not being used by internet connection sharing" Any help would be deeply appreciated

Posted by lioneatr 8 years ago


WheatStone bridge

Recently i studied the wheatstone bridge in me physics book in class but i could not understand it properly. I asked the teacher about my confusion but he also dont know. i have posted the picture of topic(wheatstone bridge). My question is ;1.Why current I1 is following through point A to D in loop ADBA. 2.Why current I2 is following through point D to C in loop DCBD.My confusion is that why current are following through these two paths. As current always flow through level of a higher potential to a level of lower potential but here it seems opposite.

Posted by DabuHackker 2 days ago


how to bridge two wireless routers with ethernet.

Https://www.dropbox.com/s/k94u03kytdn1jkq/INTERNET%20BRIDGE.jpg?dl=0 I want to add a bridge or extend (not sure of the correct term) internet to my 1st floor. I dont want  the second router or extender to connect through wifi with the first or main router, can I connect the second router to the first with cat5? and how?

Posted by ebaltierrez 3 years ago


Cordless Telephone Bridge

I'm trying to figure out how (or if) I can use an old cordless phone as a tranciever, wiring in an rj11 jack to the phone's reciever to essentially make a cordless phone "bridge" so that I can use my desk phone in an area without phone cabling by plugging it into the cordless phone's reciever. I've tried the phone over power adapters and haven't had great luck with 'em, so I'm trying to think outside the box. Anyone have a suggestion or two?

Posted by ptilton 10 years ago


Wein-Bridge Oscillator help needed

I've been searching google for about an hour now, and I need help with making a Wein-Bridge Oscillator. What I need help on:- Can I use any op-amp? I want to just go buy one at radioshack (don't feel like paying 7 bucks for a tiny IC online)- What kind of incandescent bulb should I use/is there a more modern substitute?solved by killerjackalope- Is there a way of controlling the frequency with only 1 potentiometer (I found this website but I still have the same questions as above and I don't know if it'll apply).-how much power does it consume assuming there's only a light load on the output?

Posted by guyfrom7up 10 years ago


Some Random Things I Made

Just some random things I made that I haven't posted. Let me know if you want me to post any of them. 1. Bridge 2. Crane 3. Another pic 4. Double bullet (REALLY good with drummerian's x-bow) 5. Flail 6. Catapult 7. Double sided battle ax 8. Guitar Hero stand 9. Another pic

Posted by koolkidd 10 years ago


Thieves Steal 200 Ton Bridge

I was always impressed by pranks such as the fire truck on the Great Dome at MIT, but over in Russia some thieves went waaayyy beyond that with some criminal shenanigans. These guys walked off (OK, drove) with 200 tons of metal from a bridge to be sold as scrap. It was all done in the middle of the night and it's also the only road to a heating plant. All the workers will now need to find new ways to get to the plant.So... how'd they do it? linkvia Neatorama

Posted by fungus amungus 10 years ago


Control DC Motor with a L298N H-Bridge with 24V

Hello everyone, I bought this module with a L298N H-Bridge inside: https://cdn3.bigcommerce.com/s-vt19phz/product_images/uploaded_images/l298n-motor-driver-from-tronixlabs-australia.png Now I want to control a 24V DC motor with an incoming PWM 488 Hz signal from an external converter. I don't want an arduino or something else to control it. Just from this pwm signal. How do I connect it? I use a 24V power supply.

Posted by julianpe 2 years ago


Salute to a hero.

Whilst suffering a "once in a thousand years" flood, the town of my birth lost a hero. Whilst directing drivers away from a bridge threatened by rising waters, the bridge collapsed under the feet of PC Bill Barker.  His body was found later, several miles down the coast. PC Barker leaves a wife and four children. BBC Story and associated links.

Posted by Kiteman 8 years ago


Logoff upon finding ible.

When I follow the link from the news letter to the Oklahoma Suspension Bridge ible I am not allowed to log on.  (I tried several times and was sent to the "I forgot" section, which I used and just entered all my old information.)  I use the login thing up at the top but it just won't register from there.  When I go to the home page and login and then try to go to the bridge, it shows me as logged out, but when I click home again, it has me logged in.  I haven't tried any other ibles yet but will here in a bit and let you know of the outcome.

Posted by pedalmonkey 7 years ago


dc- motor ultracapacitive skateboard

Need help in this project as I am abit lost with the programming of my project. My skateboard will be able to charge by manual moving and then discharge to electrically move the skateboard when needed. Im using an arduino board and I need to program a H-bridge with pwm and controlling the motor speed. Hope somebody can help me out asap. Thanks!!

Posted by Nicktyw 5 years ago


One Insanely Skilled Bus Driver

A bus, a tiny bridge, and a 100-point turn with wheels popping off the edge.

Posted by fungus amungus 10 years ago


Which Guitar Should I get?/

I'm getting a guitar as my Christmas gift from my parents, and i'm a beginner, so i have no idea what is good or bad. I need some one to tell what brands are good, and what I should get. I just want this guitar for fun, I'm not like starting a band. Also, I'm kinda short.

Posted by lawizeg 10 years ago


DIY ±18VDC to power a dead cordless drill

Hi! My last battery died on my cordless drill and i'm trying to transform it to a corded drill. My plan was to use a microvawe transformer along with a bridge rectifier (KBPC5010  Bridge Rectifier Diode, KBPC Series, Single, 1 kV, 50 A, 1.2 V, Module, 4) to power the drill. 120VAC from the wall to, I wish, 12to18VDC. The problem with this is the voltage given by the output of the microwave transformer is of only ±3VAC. Any sugestion?

Posted by rudecam 3 years ago


How to drive Bipolar stepper motor using MTD2006 dual H-bridge

Hi I'm trying to drive a Bi-polar stepper motor using MTD2006 bridge which I got from old copy machine.But when I download datasheet for this IC found that input signals must fed to drive the motor (ENA A,PHY A,ENA B,PHY B ) As I understand ENA signal must be (High) always! So I'm confused how to drive this IC using Arduino? Thanks

Posted by MHA6 1 year ago


Anyone here have hyperterminal knowledge?

I was hoping someone here would possibly know about using hyperterminal in windows. The situation is: 1. I am able to connect a laptop and a desktop computer via dialup modems through a 100 foot telephone wire, and transfer files using window's xp's hyperterminal program. 2. I want to somehow bridge the ethernet connection on the desktop computer to the dialup modem, to enable me to have internet access on the laptop via internet explorer/whatever. 3. If I can connect two computers via their modems with a frickin telephone cord and send files, then I know it is possible to bridge the ethernet connection into the modem like one would bridge a wireless connection to the ethernet port of a windows xp machine so they can connect a pc to the ethernet port and use internet traffic for it. 4. I know it's simply a matter of implementing it. Anyone have any ideas?

Posted by Punkguyta 9 years ago


Complementary transistors

What or which PNP Complementary transistor can I use with a N-Channel  IGBT HGTP10N120BN 35A 1200V NPT   Transistor  ? I really will thank you . I'm building an H- Bridge motor drive. Ed.

Posted by DELETED_applegoose 6 years ago


OEM Power Supply

I have an unregulated power supply, with a bridge rectifier. I suspect that the rectifier is damaged. I measured the components and the voltage on the rectifier, every connection past that measures 0 volts. Shall I replace the 4 diodes?

Posted by knektek 8 years ago


I've got one more question, bear with me

Okay, I've got one more amp question for you guys, I've already fixed up my sub box, removed the amp and screwed a peice of mdf over the hole, sounds much better than having the amp inside, much much. Now, the amp I'm using right now, it's okay (ish) but not powerful enough and it wallops too much at high power, don't like using it. I've got a standard 150 watt car amp (two brand new actually) that would probably suite it fine. But there's a catch, these are regular car speaker amps, one left channel and one right channel on each amp. And it strictly says in the manual not to bridge the connections (otherwise in most car amps you can use the L + and R - together and get twice the power without damaging anything except your speaker if it's not powerful enough). So question here is, I've emailed them (audiovox) to ask if it's because the amp just cannot bridge or if it's to warn stupid users not to blow their speakers, they were no use, wasted my time waiting for a response only for them to tell me to call in. Okay lets actually get to the question shall we? Can I or can I not bridge it? I have another amp for this sub, but at 60W a channel it won't do unless it's bridged. Should I just try it?

Posted by Punkguyta 10 years ago


popsicle sticks, and nothing to do with them....

I bought 1000 popsicle sticks to build a model bridge... The didn't work now I have over 950 popsicle sticks. What should i do with them.

Posted by ry25920 10 years ago


Bass Guitar Whammy Bar

Does anyone have any good information on how to get a whammy bar retro-fitted onto a 4-string bass? or at least where to get a bridge/bar? help much appreciated!

Posted by rawrwar 9 years ago


popsicle sticks

How many things can be created with popsickle sticks? can you make animals? weapons? chairs? cars? big structures like bridges? id like to get some inspiration on what to make out of popsicle sticks i might want to start by learning how to spell it first!

Posted by mepaine 11 years ago


San Francisco bike survey

Here is a survey for everyone out there who bikes in San Francisco. My biggest complaint about biking in the bay area is the lack of pedestrian / cyclist access to the bridges. It makes me mad. http://www.sfbike.org/?reportcard

Posted by Tetranitrate 10 years ago


Embarrassing Moments in Engineering

Mental Floss compiles four great examples of not-so-great engineering feats and one dramatic fix. The Tacoma Narrows Bridge makes an appearance, of course, as well as three other detailed examples to learn from. Mental Floss articlevia Neatorama

Posted by fungus amungus 10 years ago


DIY Hatchback Subaru Legacy

Check out this DIY Hatchback I caught a few pictures of coming off the Bay Bridge in Oakland, CA. I think the guy driving was a woodworker, and needed a couple extra cubic feet to fit things like dressers and wardrobes.

Posted by ewilhelm 10 years ago


PC Speakers IR Remote Bypass

I have a 5.1 amp for PC and the remote is not working. When plugged in, it goes into standby mode and can only be powered on using the remote.  Is there a way I can bridge / bypass the electronics so that the amp goes on as soon as it is plugged in?

Posted by kokaine 1 year ago


(home made lightbox) Keeping backlight on - which pins to bridge on monitor psu board

Thought id seek a bit of pro advice from the forums for my first post as im totally drawing blanks on this one!. i am trying to finish my custom lightbox made from an old hanns.g hh281 monitor. at the moment, when powered on, the backlight turns on then off after a few seconds as no pc signal is being received.  i have taken a picture of the connector to the main board as i cannot figure out which 2 pins to bridge to keep the ccfl backlights on :-( i was guessing one of the ground pin and the on/off  would work but didnt want to mess this up on the first go . any input would be a godsend! thanks all!

Posted by Aikon359 4 years ago


Advice for Building My First Electric Guitar

I'm trying to build my first electric guitar. I figured building a neck is not something that I want to get into my first time, so I'm planning on buying a stratocaster neck and fitting it to the body shape I've designed. I'm probably going to use 3 single coil pickups and a typical stratocaster 5 position switch. However, I want to have the gibson style bridge and knobs. Am I in way over my head for my first time? Does anyone have any advice on how to set the neck at the perfect distance from the bridge? I'm assuming I want to 12th fret to be exactly half of the length of the string, but I'm not sure. Also, if you have any other general advice, I would highly appreciate that.

Posted by saxman42 10 years ago


Simple lighting question (hopefully with a simple solution)

I inherited an awesome orange&brown 70's "painting" of the bay bridge complete with christmas-bulb sized lights set through it from behind to illuminate the top of the bridge and one of the boats passing underneath. The cord for the lights extends about 12" below the painting--it appears it was designed to be put over a wall socket (who hangs paintings at ankle height?). No wall sockets on the side of apartment hallway where I want to hang this anyway, so I am contemplating making a battery pack to light it up in the evening. I need an electronics refresher--how can I determine what type/size of batteries would be necessary? What other considerations should I keep in mind? Will post a picture when I return home. Thanks in advance!

Posted by gtj 11 years ago


DIY Diesel Motorcyle, "Die-Moto"

This was built by a bay area group just a bridge away from Instructables HQ. It's the world's fastest diesel motorcycle.  Sounds like it's time for us to establish Instructables Racing! Anyone got a spare engine? Die Moto

Posted by Culturespy 8 years ago


Is this bridgable?

I've got the amp of a jvc mini componant stereo that came with these gigatube speakers which where 3 way enclosures with a subwoofer in each. This amp would probably work better for my subwoofer I have now but I wanted to know if it is in any way possible to bridge the sub outputs of the amp so I can have a more powerful single channel.

Posted by Punkguyta 10 years ago


Run AC device on DC: An idea, could it work?

I need to run an AC powered audio mixer on DC current from a battery. Yes, I could buy a power inverter, but I want to make the system the simplest I can, and I also have an old small mixer I'm not using (that I can experiment on). I'm self taught on electronics, so please tell me if there's any inaccuracies in the following lines: My idea is to find where in the circuit AC gets converted into DC, and then at that point feed the DC current from my battery. I think that point would be right after the bridge rectifier. So, in shot: Can I connect de dc output from my baterry to the end of my audio mixer bridge rectifier? Thank you!!

Posted by FrancoMolina 1 year ago


Café Twin Arts and Science Community Advisory

Http://cafetwinctv.blogspot.com/ Cafe Twin Community TV Show__ A Bridge to Music and Science with conversation and project development on a community level and via community twining as demonstrated post World War II in Europe with leadership from France and Germany Twitter ID: waldenthreenet

Posted by cafetwin 5 years ago


Soldering Aluminum to aluminum

I'm building an aluminum bridge for my railroad.  I need to solder the side braces rather than using screws and nuts.  I've ordered a 150 watt chisel soldering iron and need to know what items (solder etc) I need to perform this project.  Any assistance greatly appreciated.  I would rather not use a torch on this project unless absolutely necessary.

Posted by trainman707 7 months ago


Where to start to set the intonation on your git

This information assumes you know the basics of intonation, I will post information on that as well just in case. (Seperate post) In the following illustration the lines depict the front edge of the individual bridge pieces on most modern guitars. When looking down on them their relationship to each other, this only gives you a start point to adjusting the intonation.

Posted by fenderphil 7 years ago


Xbox remote power ON

I have a softmodded original xbox, and it is located in my basement. It is a huge pain to go downstairs just to turn it on. I am looking for a solution. Originally I had planned to do WOL (wake on lan), but the nic doesn't support it. All I have to do it have something that acts like the front button: bridges two wires momentarily. Any suggestions

Posted by dwj300 9 years ago


Using the flash from a disposable camera?

I recentaly took apart a digital camera hoping to be able to find a way to use the plain old flash when ever I wanted to to flash it at night at my friends. I acidently bridged and shocked my self owwie. But i still cant figure out how to use the flash once its out of the camera ofcourse with the circuit board and that still attchaed. Any help would be nice.

Posted by CowGuy 11 years ago


Stepper motor controllers

Does anyone know where I can buy some bipolar stepper motor controllers and an H-bridge in one package? Or even better, schematics/pcb layout of a driver board?UPDATE:Does anybody have any experience with the Easy Driver? It seems like a cheap alternatives to some of the other available controllers, but I just want to know if you get what you pay for.

Posted by ongissim 10 years ago