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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!

Topic by HAL 9000    |  last reply


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.

Topic by cd41    |  last reply


What is Bridging?

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

Topic by Ziegbod    |  last reply


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

Topic by jamesk891    |  last reply


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.

Topic by DabuHackker    |  last reply


Can i bridge two bridged amplifiers?

Well, the question itself tells a lot (mostly how bad it's asked). I have a quad amplifier that i'm using as a stereo bridge. So is there a possibility to bridge those two (or parallel em?)   This amplifier is not some factory made amp, It's a simple amp i made with TDA7375. The output is somewhere between 2x30 and 2x40W , but i'm only using one channel and it seems like a waste (I'm using it as a small woofer driver, didn't have another amp so this one had to do) So, The question is Is there a way i can make this Mono so i can get some more power out of it (or just use both channels so i don't only use one). The amp is TDA7375 and the speaker is Novex sps250i (yeah, it's crappy but sounds decent) Also it says nowhere that this one can be bridged to mono. Also won't it work if i parallel two channels and then bridge them to mono? (as in parallel four into two then bridge those) From what someone told me if i want to parallel it i'll need some 0.1ohm 5W resistors (those are really cheap and easy to find here) Thanks in advance.

Question by T0C    |  last reply


Diodes for Bridge Rectifier?

 Please Help! I need to make a bridge rectifier for a shake charging flashlight which also include using a 5V regulator - so it won't be a very high voltage, if that matters.  What type of diodes do I need for this bridge rectifier?  HELP!  thank you! patti :)

Question by mckywer    |  last reply


Transistor H-bridges

Is it possible to make a transistor H-bridge with PNP transistors or can it only be done with NPN transistors.  As far as my knowledge( or lack thereof) of transistors goes, I think it would be possible, but it would require more than 4 transistors and it would be much more complex, however I could be entirely wrong.  Any input would be helpful, thanks.

Question by jpenn    |  last reply


making a bridge on a sledge ?

I know thats a wierd title but i have an explanation. i reckon its going to snow soon and to get to the best hill me and my freinds have to cross a frozen stream about a foot wide but 6 foot at the top of the v shape its in  we cant jump like we would any other time of year because of the sledges weight we couldnt get far enough and we`d land on the stream and get very cold. so is there any way that anyone can suggest of atatching a bridge to my sledge (a bit like the mt 72 tank principle). four main criteria are:lightweight ,removable,cheap and 3 foot long(the sledge is already three of the six foot) i have an idea but its heavy.the sledge is wooden and has an 8inch by 3 foot space underneath and is about a foot off the ground.all ideas are welcome! please help.thanks ,wood wizard. UPDATE i have limited wood can anyone suggest a design where the bit of the sledge where you sit becomes part of the walkway. also im getting two of the desgns ive thought of on my site : http://my-site-me.webs.com/

Question by wood wizard    |  last reply


a good prototype bridge?

I found none that are good can you please help

Question by adamray2106    |  last reply


bridging my connections

I need help bridging my connections. everytime i try it says i must select two LAN connections that are not using internet connected sharing. i have looked all over and am pretty sure its all off, it wont let memerge the two together by highlighting them either it just moves the connection order around please please help. thank yoou!!!?

Question by RECONWARRIOR    |  last reply


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?

Topic by ptilton  


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]

Topic by Jayefuu    |  last reply


Are all rectifiers bridge rectifiers?

Do all bridge rectifiers have 2 inputs for ac and two outputs for dc.  I see some components called "rectifiers" which have three pins.  Does  this item change ac to dc?

Question by Noblenutria    |  last reply


What bridge design is best? Answered

I need to design a bridge for a project but it has to be made out of MDF that is 20cm x 33cm x 3mm MDF that is 3mm x 3mm x anything hot glue and string. It has to be strong, span 60cm have a 30cm clearance and be 20cm wide. It can have no supports and not attach to the ground. The wide MDF can only be used for the road and you cannot layer it.

Question by eggyeggyeggy    |  last reply


Are bridge rectifiers "downward compatible"? Answered

If I have a power supply circuit that requires a 25.4VAC, 2A transformer connecting to a bridge rectifier, could I use a rectifier that is rated at 50V, 4A, or do I need to get one that matches the input more closely?

Question by Xombee    |  last reply


Bridge rectifier max current

I have 12V 1,8A transformer and few 1N4007 diodes that should rectify only 1A. But if i connect them in Bridge configuration will current pass through 2 diodes at each cycle and be Safe to use Up to 2A?

Question by AnotherD1    |  last reply


H-Bridge Circuit Help

Hello,I have an assignment to build an H-bridge circuit to control the direction of a motor with two buttons. The only materials I can use are depicted in the image; only three resistors, a battery pack, two button switches and an L283D chip. Based on the template given to me, I constructed the circuit as shown in the picture but it does not work. It looks very messy and I'm sure there's an easier way, but I just want to get it working first. If anyone knows what I'm doing wrong here I'd appreciate it.

Question by GaleDale    |  last reply


SMPS H-Bridge trouble

Hi,  I've built a 1kW SMPS designed to take a 350V unsmoothed DC input and convert it to 3kV @ 300mA. The circuit is basically Uzzors2k's design seen here minus the overcurrent protection and smoothing capacitor (for now), however I accidentally wired the GDT outputs backwards so the gate resistors (33ohm 2W) are on the source. I have used alternate MOSFETs the latest attempt with FDPF16N50T's. I've had various problems with the circuit, primarily the MOSFET's exploding seemingly from overvoltage (evidence of flashover in some cases despite no evidence of secondary leakage (i dismantled the transformer to check)). During my last test I had a flashover between the drain and source pins of one of the FET's, in addition all of the gate resistors were smoking hot after, seems the gates had all been shorted (first time this happened, other occurrences were from case to ground). This happened despite the variac only being turned up to 40% which should be well well below the pin spacings maximum voltage tolerance. I have checked the drive signals, they are quite nice square waves at about +-15V with some oscillation on their rise. I have built SMPS's before, one is currently working with similar MOSFETs using a half bridge at 300W. Does anyone have any suggestions as to why these troubles are occurring or have any suggestions to fix it or have any alternative circuits that may be less troublesome (is a h-bridge easier to manage?)? Thanks, Stephen I​ just gave it another test with a H-bridge instead and the source of one of the FET's blew so it appears that there is just FET failure and maybe not arcing between drain and source.

Question by The MadScientist    |  last reply


How to make a strong bridge by using

How to make a strong bridge by using 15 straws , 35 paddle pop sticks , 3 sheets of cardboard, 50cm of sticky tape, wood glue? my bridge have to be 25cm long and 14cm wide. Thank you for helping

Question by bryan1234567890    |  last reply


How to construct a Bascule bridge using only popsicle sticks, glue and cotton strings?

How can we construct the truss structure and the hinges, mainly the hinges, using only the sticks, thin (1 mm cross section) cotton strings and glue? can u please suggest ideas for the design of the same?? We would also appreciate if you'd give us suggestions for the construction of the open-close mechanism, which incidentally, what a Bascule Bridge is all about!

Question by fear_black_death    |  last reply



Does anyone know if an IO-bridge module is a microcontroller, or just a bridge to the internet?

Would you need an additional microcontroller, such as an arduino, or could you control servos and lights directly from the IO-Bridge module?

Question by Bostonians    |  last reply


How do you play bridge?

How can I teach bridge to friends?

Question    |  last reply


Using the IRS2110 for 36v H-bridge? Answered

So i have some 850W 36v DC motors that i need to design an H-bridge for, and ive decided to use the IRS2110 to driveing them, since i need to drive the highside fets. I however have no idea of how to use that chip. Any help? :P

Question by dumle29    |  last reply


how to measure inductance using a bridge?

My LCR meter can only read inductances of mH to a few Henries. I need to make a 470uH inductor, since in my place inductors are not so common. How can i measure inductances at microhenries if my LCR meter's reading capability only ranges from millihenries to henries? Someone told me to use bridges like wheatstone bridge or maxwell bridge to have an accurate reading, but i don't know how to do it. Can you suggest any reference? I prefer doing wheatstone. Thank you in advance :)

Question by codestroy7    |  last reply


Need urgent help in H-bridge!! Answered

Hi,      I am building a H-bridge to drive my robot's motors. I am using the circuit from the following link http://wiki.mech.uwa.edu.au/index.php/Micro_crash_course/pwm#P-channel_FET     (Figure 12). For the mosfets I have used IRF540 and IRF9540. The moment I connect this circuit to my 12v power supply, the IRF9540, heats up very quickly although I have not connected it to any load !  For logic input, I am using the Arduino. Please help me with this H-Bridge circuit. Thanks in advance.

Question by Jayvis Vineet Gonsalves    |  last reply


Use internet while bridged connections?

I did the instructable for using your laptop as a wireless access point for your xbox 360. I got live to work but now when I have the connections bridged I can't use the internet on my laptop at the same time. Is there any way I can use my wireless internet on my laptop while having the connections bridged?

Question by ovk2k5    |  last reply


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

Topic by fungus amungus    |  last reply


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?

Topic by guyfrom7up    |  last reply


Need expert engineering help to build a foot-bridge!?

I want to build a foot bridge across a creek! The width of the creek is 16', but I'm going 24' long to support the footers. The bridge itself will be 4' wide. I was thinking of using "C" channel iron welded onto I-beams to hold the treated 2x6's in place. I need info on what type and size of beams, etc. If it's not too obvious I'm a complete engineering noob, but this is the kind of project that makes country living worthwhile. Thanks in advance for your kind help!

Question by FyreAntz    |  last reply



do any one know how to make a salt-bridge in mfc?

Do any one know how to make a salt-bridge in mfc? please give some suggetion

Question by mohit_leo    |  last reply


how many Popsicle sticks dos it take to make a truss bridge ? Answered

I'm doing a science fair prototype bridge but I don't know how many popsicles sticks to build a truss bridge

Question by adamray2106    |  last reply


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?

Topic by sonny301    |  last reply


Three anchors each side, bridge level with top anchor - best triangular design ideas, please! :7D?

Hello! I'm a bit stuck on making a stable, theoretical bridge. Rules: No one piece can be longer than 10, no shorter than 1. The bridge must span at least 8. Imagine a gully: \______/ There are three anchor points that you must use on each side - the highest is at the top, the lowest halfway down (not that that makes too much difference...). You have 80 pieces with which to build your bridges - please can you lend me your noggin's as I'm having trouble coming up with ideas that will bear a load. A regular suspension bridge or a tressle bridge won't work, as the joins for the pieces are not fixed solid - so you must use triangles / tension to support them. A bit like loose mechano, or whatever it is people have these days :7) Do they still have lego? I haven't seen a kid play with lego for ages... It's mostly P£3 and Sega Megadrives and stuff. tsk. Thanks! Claire. [ed] I just noticed a knex catagory. I guess that's mechano, right..?

Question by The_Saccade    |  last reply



if i want to rectify 12v AC to 12v DC how much values of diodes i'll use and how can i calculate it(i.e diode 1N4007)?

Like we mostly used (4 x 1N4007) Rectifier bridge to convert 12v AC to 12v DC.why and how we can calculate it?Formula?

Question by AliR79    |  last reply


Shift Mosfet and H-Bridge for Arduino Question?

Hi guys, Im Rinozen.. Im newbie on Arduino and Electronic ^_^ Anyway, can you guys please help me? Look at the schematics i've uploaded. Are there something wrong about the track? And what value for the Resistors and Capacitors for the right choice? Sorry about my english ^_^ Thanks for reply... :)

Question by rinozen    |  last reply


H-Bridge Minimum Voltage That Can Be Switched

I am making a circuit that can switch the polarity of the output of my voltage supply at the timed intervals using a microcontroller. I am using a circuit similar to the one at this link: http://www.robotroom.com/BipolarHBridge.html. It works, but not at when the power supply outputs below about 3 volts.  Is there any way I can modify this circuit so that it switches the polarity all the way down to 0 volts?

Question by Ethanal    |  last reply


whats a good design for a mini balsa wood bridge? it has to hold 100 pounds!?

Must have: mass- 45.0 grams or less length- must be longer than 38.0 centimeters (2.0 cm by 2.0 cm square rod must be able to pass through full length of roadway surface) height & depth- can't extend more than 12.0 cm above test support surface and 10.0 cm below it. roadway- will support 100lbs load, cannot be more than 2.0 cm above test support surface BRIDGES CAN'T BE WEDGED INTO SUPPORTS) someone please help, i'm stuck!

Question by erikabixby    |  last reply


controlling coil using H-bridge...possible? Answered

Hi! Yesterday I bought a Nikko X-pander r/c car, for only $ 3, and I want to put my own electronics on it. I've seen that the front wheels are controlled by some sort of electromagnet that changes polarity to turn the wheels left or right. I already made my own homemade L298 module and I want to know if it's possible to use one channel of L298 driver to change the angle of the front wheels. Thanks.

Question by Timofte Andrei    |  last reply



How to make a high amp bridge rectifier?

I want to drive a peltier plate from a 12v transformer coupled with a bridge rectifier , but the diodes get very hot , so how can I make a high amp bridge rectifier that can provide upto 10 amps?

Question by ssahoo1    |  last reply


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

Topic by fungus amungus    |  last reply


Do the bridge pin holes need to be tapered?

I am replacing a bridge, on an acoustic, the new bridge does not the peg holes drilled out yet. I found one site that says to ream with a tapered reamer from some company. This has got me worried because I have drilled the holes to 3/16" but the pegs don't go all the way down. I have not gone to my go to guy yet cuz its almost twelve thirty at night, please help.

Question by addicted2paintball    |  last reply


are alternators AC motors with bridge rectifiers and/or diodes? Answered

I've got these two motors that run on direct AC (120 V). I want to generate electricity with them. Will they produce AC electricity that i can then feed through a bridge rectifier? Could you explain how an alternator generates electricity?

Question by cdubnbird    |  last reply


can bridge rectifiers be combined to double the amps? Answered

Say we have 3 amp 3 rectifiers soldered would that function as 9amp rectifier or needed to be wired in a special way, series, paralel with other components? I am building an unknown power wind gen ans I gave 10   3 amp rectifiers. Thanks for sharing.. Al

Question by celalboz    |  last reply


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?

Topic by ebaltierrez    |  last reply


Ardiuno Ethernet W5100 ic solder bridged? Answered

Hi I got a Ethernet shield for my arduino I have ordered, but the problem is that the solder on the IC seems to have run and bridged the connections. I have some pictures taken with a lens I had laying around... This is what I found. Please can you help me decide weather I should take it back for a full refund?

Question by Daniel Deacon    |  last reply