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

Adjustable solder iron

Hello sorry if this is the wrong place, i'm pretty new here. recently i got a 30w solder iron and found this instructable to make it adjustable I know it won't be as good as buying a real adjustable iron but this is cheaper and will work.  I have a little potentiometer that i got from a lamp but unlike most it only has 2 terminals and a space for a third. i did some experimenting and it seems to work fine, the 2 terminals are a middle and one to the right then a space to the left i hooked a wire in the space and it basically worked in reverse to when it clicked off it turned the (in this case) motor. so my real question is how do i wire this up, can i just wire the "hot" wire threw the pot and will it work to make my iron semi adjustable the only info i have on the pot is that on the top it says B500k i can take a picture of it if needed. 

Topic by chairsgotoschool   |  last reply

Adjustable Keyboard Tray

Trying to figure out how to make an adjustable Keyboard/Mouse tray for ergonomic purposes. Seems like it might be relatively easy with some kind of flexible tubing e.g. flex eletrical conduit. and piece of wood for the tray. Very surprised to find near 0 content on the web with this, especially since these trays aren't exactly cheap.

Topic by jtrimmell   |  last reply

Adjustable sights anyone?

Is this the first knex adjustable sights?

Topic by Katarukito   |  last reply

Adjusting to a New City

I just moved to San Fran from the east coast and don't really know too many people or places here.  Does anyone have any good tips on how to adjust to living in a new city?  Places to go things to do, etc...

Topic by Carleyy   |  last reply

Adjusting pH levels?

So, I am doing a science fair project about what  pH level is best for sea monkeys and what happens with the other levels.  Dies anyone know how to  adjust the pH levels easily in such a small amount of water??

Question by kyluddy   |  last reply

Adjustable strobe light?

I want to utilize my old Sears induction timing light as an adjustable timing light for work. I like using a battery as it is not always easy to get 120V from anywhere near the part I am trying to see, plus the wires tend to get in the way.....rotating parts and loose wires don't always mix well. Any ideas?

Question by Monger   |  last reply

Home page adjusted

Well, the last home page change wasn't quite as successful as we'd hoped.  We heard people saying that they didn't like the moving pictures, and wanted the titles visible, without having to hover.  So I've just pushed out some modifications that change those things.  We hope the current version is better!

Topic by rachel 

Adjusting thong size

Hey all! I have this problem, where all the thongs I get with outfits are too big for me. But, seeing as I love matching outfits, I really hate to throw them away. Yet I just can't figure out how to make them smaller. It's killing me.  Any help would be much appreciated. Thanks!

Topic by kssmedeadly   |  last reply

adjustable light switch?

​i really have no idea what im doing but you might be able to help. Im working on a model train layout. the Model train transformers or really any three prong electrical device would plug into this. what i want is for a kid to press a button the train goes for 2 min then stops. the child does this 4 more times. after the train stops  for the 5th time it activates a cool down clock for 10 min. it would have to work with electricity from an out lit. Any ideas? other details would be a visable countdown clock.  it would be helpful if the run times and the delay times could be manual adjusted.

Question by andrew.l.arth   |  last reply

Accurate adjustable resistor?

I need a simple, low cost, small device capable of 10 different resistance settings, and must be capable of mechanically reproducing them exactly, on command.  It cannot be a potentiometer, as it is innacurate without some sort of  measurement device (which I cannot use), nor a rotart switch or encoder (too big and expensive, cannot use digital).  Basically, is there some alternative <$2 that will do this.  Again, no digital stuff or measuring position, only going between several set resistance settings (but any incrament thereof is okay).   

Question by jduffy54   |  last reply

How can I make a (relatively) simple adjustable height desktop?

When I was working in tech support many moons ago, the office had these great adjustable desks. If you wanted to stand up while working you could raise the keyboard and monitor up to a standing height and if you got tired of standing, they would lower down. There was a motor that did the raising and lowering on those desks. I'd like to make something similar in the simplest way possible. Bonus points if the solution can be placed on top of an existing desk and still work.

Question by EmmettO   |  last reply

Has anyone converted a waterbed to adjustable airbed?

I have a California King, dual mattress waterbed that I would like to convert to an adjustable airbed, similar to the Select Comfort " Sleep Number" bed. (they cost over $1500).  My wife has a real bad disc in her back, and I have to keep increasing the water level  firmness.  We use a memoryfoam top, with a very firm density of 5.5 lbs per sf, if I recall correctly.  She cannot sleep on a regular mattress (we have one).  Surgery is out (no insurance, unemployed, own too much land, etc, to qualify for aid).  Has anyone tried this? Dublinrun

Question by dublinrun   |  last reply

Adjustable bed remote fix

I  will have to throw away, at much expense,  and replace a terrific adjustable bed because no one seems to know how to fix the remote control broken red bulb.  After a trip to and from the supposed specialists in WinstonSalem N.C., it came back with NO bulb, and both a screw and a small piece missing!  When I called, he informed me it was working when it left there... How would he know WITHOUT  the bed?  Top that with him insisting it 'doesn't NEED the bulb to work'.   Any advice on what bulb  for a 9 volt, and precisely how to know circuit board terminals ?  

Topic by 10TanToes   |  last reply

adjusting brightness in you tube

Is there a way to adjust brightness in you tube videos

Topic by pops1943   |  last reply

Is there a LED with adjustable Wavelength and color?

I just need a LED that can give me desired color and wavelength (in nm). I just googled but found nothing. Hope I will find one. Thanks in advance.

Question by Dasaradh M S   |  last reply

Adjustable Voltage on PSU ATX

I have an old Rockford P450.4 amplifier that I salvaged an LM317T and LM337T from. It also had some two (2) potentiometers that I salvages as well. I have a 400W Coolamx PSU ATX that I turned into a bench supply. I have read that people have been using these two (2) IC's to maintain a constant voltage through variable adjustment. I have seen several tutorials on instructables, but that all lack clarity, instruction and do not provide enough detail. I could really use a good tutorial, but have failed to find one of great interest.

Topic by bprins   |  last reply

Adjustment of the speed of a DC motor Answered

I'm working on something that requires a very low speed motor (~.5-4 RPM). I found a motor that runs at 1.5v @ a maximum of 7rpm (5040RPM max with 1428:1 ratio) I need however, something to lower and raise the speed of this motor. I know that people say PWMs for this, but the only one I can find is a 12 volt and has gotten mediocre reviews. Could I use this 12 volt PWM in this system, or could someone point me to a reasonable PWM that would work?

Question by sblaptopman   |  last reply

Looking for adjustable accordion arm

I recently had a great idea for a completely useless, yet hilarious project for me to work on, but I am stuck on a single piece.The end result is a joke device that uses one of those accordion, spring loaded boxing gloves controlled over USB (the idea came about in a discussion over the universal wish to punch idiots over TCP/IP). To understand what this is, you'll have to think slapstick comedy and saturday morning cartoons (of the Wile E. Coyote variety). It sort of looks like this but replace the lamb with a boxing glove, and when extended looks like this: XXXXXXXX. Imagine the coyote opening a door that he expects the Road Runner to be behind, and out pops a boxing glove on an accordion arm that hits him in the face, making those little roadrunners circle his head.I suppose I could make one out of some material (metal, plastic, wood?) but I don't have much in the way of fabrication facilities in my new apartment. The best outcome would be if I could get such an arm off of an existing device.Sure other things could work (a piston for example), but the look of this project is very important and an accordion arm is a requirement to that end.Any idea on how to go about building/obtaining such a thing? I can't even figure out what to use as search terms.

Topic by opqdan   |  last reply

adjustable power supply question? Using a LM338?

so I'm building a power supply that will have multi power outputs, from surge protected 120,  36v 10a 24v 2.5a,  12v 3a  9v 1a, 12v 1a,  5v usb, and 12v cigarette lighter output. there is also an adjustable 1.25 to 32v  5 amp, the problem i'm having is no mater what set up I try, I never get more than 1.8 amps out of the LM338, I have an input of 36v 10a, I've tried several diagram , can anyone point me to a diagram that will actually allow a full 5amps to be pulled? I have the LM338 on a huge heat sink. 

Question by ihoppoet   |  last reply

Universal (adjustable) Rechargeable Battery Power Supply?

I would like to build a battery power supply that has these features: * holds some number of commonly available alkaline or rechargeable cells (AA or C since those are pretty common) * has adjustable voltage for 3V-18V (or whatever might be practical) * has adjustable current 100mA-3A (again, whatever is possible) * batteries can be recharged by plugging in to normal AC outlet * can still function as a power supply while charging (perhaps via AC?) Is such a thing possible? With phones, iPads and other items that are battery powered, it would be nice to be able to power a few accessories via battery and not need to recharge (i.e., be able to load fresh batteries) if on a remote recording session (for example). I don't know much about electronics, and would need a higher degree of hand-holding for parts selection and other stuff. I am good with a soldering iron and have done a few DIY projects and kits that have all worked fine.

Topic by stubbsonic   |  last reply

Ideas on how to mount an iPad to a child's wheelchair?

Does anyone have any ideas for how to mount an iPad to a child's wheelchair...also making sure it is adjustable to be able to get the child in and out of the chair?  Also, any ideas on how to attach a stylus so that it doesn't get dropped or lost? As you can see from the picture, the way we have it isn't working out so well.  Thanks in advance!

Topic by mom2maddy   |  last reply

I'm looking for a simple way to raise/lower an existing desk for seated/standing pc work.

This is the closest thing I've found yet: I have been tinkering with a crank/cable idea, maybe counter-weighted; nothing good yet.  It has to raise/lower about 18 inches smoothly and with good stability.  Manual cranking is preferred - electric motors or hydraulics seem too complex/expensive.  Thanks! Just uploaded a photo of the desk. One more note - if I were stating from scratch, I might look at one of these:  But I like this desk, just want a bit more flexibility (maybe even slide a treadmill under one day if I can raise it even further)

Question by spokehead   |  last reply

How to make a Variable/Adjustable Power Supply ?

Hi Everyone, I am having (12 - 0- 12)V and 1.6A AC to DC Transformer, and I would like to make Adjustable power supply, How I can do that? and on reducing the voltage amp would be same ? or amp also reduces ? and Also want to add a USB port to charge my mobile devices.. Transformer image Edited. I want to build my own Custom circuit using bridge rectifier and some Capacitor and resisters. Alhtough @-max- answer is very good and thinkable, Can you recommend some Good ready-made adjustable circuit which having the capability to control Amp and also volts ? Please provide link or Name/Model# Please guide me.. Thanks

Question by qazihamayun   |  last reply

Whats the easiest way to make a height adjustable wash basin?

 I would like to make a height adjustable wash basin for someone in a wheelchair. It needs to be capable of being adjusted with one hand and must be able to lock in position. I already have the flexible plumbing supplies and waste fittings. I know that it can be done with electrics but am looking for a cheap alternative. Thanks.

Question by despooner   |  last reply

where can I get 50-300 uH adjustable coils?

I'm trying to build my friend a Theremin for Christmas (obviously wont be finished by then), and I can't seem to find a few parts for it. Its a design that comes from Popular Electronics November 1967 Issue ( It calls for 50-300 uH adjustable coils and I can't find 'em anywhere. I have found adjustable coils/variable inductors but I haven't been able to find any with this inductance rating. Aside from building my own, I'm at a loss here.

Question by smkoberg   |  last reply

Can someone please put up instructions for how to make a shamballa bracelet?

I have this beautiful shamballa bracelet and I am determined to learn how to make it. i understand the cobra stitch, but i cant figure out how to do the adjustable closure. If you dont know what a shamballa bracelet is, google it, they're awesome. Check out this link: and look at the current men's collection. mine is simpler than that, but thats what i'm talking about. if anyone has any help for the adjustable closure and how to do it, i would appreciate it!

Question by jennyxamore   |  last reply

How can I control the heat to this band heater? Answered

I need to be able to control the heat of this heater Located Here What do i need to do this?

Question by TWMCNANEY   |  last reply

Husqvarna chainsaw carburetor adjustment tool

I just worked on a Husqvarna 142 chainsaw for a friend. Yes, there are openings in the side of the machine so the Low and High carburetor screws can be adjusted, but a special tool is required, or parts need to be removed from the saw so the screw shanks can be grasped with a pair of needle nose pliers. A special tool is svailable for about $6 US. It fits over the longitudinal ridges on the upper part of the screw shank. I discovered the right size of semi-rigid plastic tubing makes an effective adjustment tool. Just cut a length three or four inches long. Push one end onto the desired screw shank and turn to adjust. The tubing is rigid enough that it does not twist, but turns the screw needing adjustment.

Topic by Phil B   |  last reply

Adjusting the truss rod inside a guitar?

 I'm trying to adjust the truss rod on an acoustic guitar, but the bolt isn't on the headstock, so it must be inside the guitar. But the only thing I feel on the inside of the guitar is a small hole the size of a small screw, please help.

Question by adamgillies   |  last reply

Volume adjusting stereo audio amp?

Hi, I want to make something like have it be stereo and also use a 386 audio amp. Is this at all possible and have you seen schematics for something like it? Thanks for looking :D

Question by Modarius   |  last reply

high current adjustable power supply? Answered

I want to run my ps2 in car, Any circuit to drop 12v to 8.5V at 6amps the lm317 circuit is not powerful enough

Question by ARJOON   |  last reply


Can anyone help me with an obsolete, old school circuit board adjustable bed remote control? it worked til the last fall that cracked off red bulb. I'll pay someone to fix. And to please  not make it worse as the remote 'experts' in Winston Salem did. Hope all photos are showing here....the red bulb is now completely missing.

Topic by 10TanToes   |  last reply

Adjustable, bluetooth, etc.

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.

Topic by milkyway312   |  last reply

How can you adjust timezones?

OK, everytime I see a comment, the time is very diffrent from mine.I just posted a comment. My time ( checked ALL of my watches) was 7:03, yet on instructables, it said 3:03I was wondering if I could do anything so that my times match? Perhaps on Instructables or Firefox???

Topic by Keith-Kid   |  last reply

Vertically Adjustable TV Wall Mount

I am in need of a vertically adjustable wall mount that would hold a 32" LCD TV and raise/lower the tv with 12-24" of travel. I live in an apartment and am on a tight tight tight budget, so I am trying to dual purpose a TV to be both computer monitor and bedroom television. My problem is that when the TV is sitting on the desk, I have to look between my feet to see it from the bed. It just isn't comfortable viewing. If I were to mount it at proper viewing height from the bed, I would be craning my neck to see it. I have scoured the internet and the only mounts they make like this are as expensive as another TV.  I am a novice at this kind of thing, so the simpler and cheaper the better. If I could mount some sort of track to the wall and use a heavy pin to set the height or something like that, that would be an idea. Any help would be much appreciated! Thank you,  Sean

Topic by SlyBlackDragon   |  last reply

Block and Tackle Help - Adjusting Lift

Hello, I am working on a project that will lift up a flap, that is mounted to the bottom of a screen door, when the door opens. I am using a block and tackle to do the lifting when the door swing open. Everything works as expected but I would like the flap to travel more, move up/down more but I am not sure how to accomplish that. I the attached image, the red X's indicates a non-moveable part. The 2 black circles are pulleys. The yellow line is the rope. The green up/down arrow is the part that I would like to raise up higher. Is there a way to do that without getting too complicated? Thanks!

Topic by sdtacoma   |  last reply

Mini Bike Chain Adjustment Trouble? Answered

I recently bought a bunch of pocket bikes all in good shape but all had some sort of problem.  I took the best parts off of them and made one extremely nice bike.  The one problem I am having with it is that the chain likes to come off.  There is a bolt connected to the back axle that tights and loosens and slcks or tensions the chain.  How do I find the "butter zone" where it isn't too loose to come off, and it is too tight to come off?  The two sprockets are lined up really well, but they are a little off.  Would it be possible that that was the problem?  When I say a little I mean like so small its less then 2-3 mm from drive sprocket to driven sprocket.

Question by Electric Spectre1   |  last reply

how to fit a small voltage regulator(with a dial) into a 2xAA battery box?

I would like to know if anyone has step by step instructions on how to build a voltage regulator on a 2xAA battrey box, i will be using 2x 14500(3.7v 1000mah) lithium battery on this box. the voltage should be adjustable from 1.2v all the way to 6v

Question by pixellized   |  last reply

Lm317 to a 48v ac powersupply, or how to lower the voltage 10 v. Answered

So i have this transformer that puts out 48v ac. I want to make a variable power supply, and it should put out 7 or more amps. I could use lm317 with a bypassing transistor, but lm317's maximum input-output voltage differential is 40v,  so what should i do? If anyone has ideas how to lower the transformer's voltage 10 volts that would be great.

Question by jukees   |  last reply

is it possible/how can one make a motorized and adjustable wire reel for a tesla coil?

I want to make a tesla coil and i dont have the attenchen span to hand wind it or wind it on a a lathe. im not sure the height of my coil yet nor do i know the thickness of wire im going to use, so im looking for a reel that is preferably motorized but can be hand cranked. this needs to be adjusted so i can make differant heights of coils and differant thicknesses of wire. Im partly looking to make this so that I can make multiple coils, if I was trying to just make one coil I would hand wind it over a long period of time.

Question by pmk222   |  last reply

I have an A-C adapter with adjustable voltage..

It can put out several different D-C voltages. It only puts out 2.1 amps. Does anyone know how to increase the amperage output?

Question by topothemtn   |  last reply

Help finding adjustable and slip resistant material!

I am working on a project where I want to be able to paint with 5 brushes of different sizes simultaneously. For this, I need to build a device that can hold 5 paintbrushes together, one next to another with a 0.5 inch gap between them (so the bristles don't overlap). My challenge so far is to find a clamp or material that can adjust to various sizes of handles while keeping everything still when I push down to paint.  I have tried to poke the brushes through a piece of foam but they will slip and go through (depending on the shape of the brush). Someone suggested duct tape but I'd like this device to be reusable and easy to change between brushes.  Basically, can anyone suggest an adjustable clamp or some better material that can fit various diameters and hold still?

Topic by Julep   |  last reply

Free energy via adjusting buoyancy- why not?

Hypothetical setup- a floating object which can adjust its own buoyancy via ballast tanks full of air (if it's a submarine) or compressing/expanding a helium bag (if it's a blimp).  Naively, it feels like the amount of energy you could harness by letting it float and sink is a lot compared to the amount of energy required to adjust the buoyancy, but I'm starting from the axiom that free energy is impossible so I must have made an error somewhere. If we take the example of a submarine, is it that filling the ballast tanks with air effectively raises the sea level by a tiny fraction, and that water's potential energy is what makes the submarine float upwards? I guess in the case of a helium balloon, the act of inflating it pushes the atmosphere upwards and that is what provides it with lift.  This question was prompted by a Youtube video of a hybrid helium-balloon-airliner that used buoyancy to reach altitude and then glided back downwards, which made me think "that's quite a neat idea... hang on... where does the energy come from?".

Topic by PKM   |  last reply

adjust normal speaker to use as guitar speaker?

Hi, As you know normal speakers (Hi-Fi, cassette players,...) and electric guitar amplifier speakers are different. Apparently guitar ones work in 75Hz to 5KHz frequency range.  I want to make a normal speaker to sound as much as possible, like a guitar speaker. after searching on the internet I found that with band-pass or band-stop passive filter I can achieve that. Anyone have any idea how can I do this and if this is going to work or make any difference? Do you have other suggestions (besides buying guitar amp or speakers ) ? Thanks  for your help

Question by ehsan_zt   |  last reply

lift table from old adjustable bed

Have two old electric linear screw actuators that work great. I Need a lift table but can't figure out how to put it all together. I don't know what width or type of metal use for the lift or the bolt hinges???.  Does it have to be a scissor lift or can I keep the actuators where they are at each end of the bed, wire them to work together and make a lift that way?  I need an affordable way of doing this and it only needs to lift to about 500 lbs. from 17 inches off floor to 30 inches off floor.  All framing is angle iron but seems heavy duty. Anyone's help if greatly appreciated as I just cannot afford to spend $ 1000. + on an electric massage lift table. The pic is after everything but the motor/actuators were removed. Thanks Deb

Topic by DebMaudie   |  last reply

ideas for a dog carrier, adjustable height or telescoping

I want some ideas that you may have for a carrier. background: I want to bring my Dog on an airplane but he can't ride in cargo because there is a summer ban on dogs during hot months. I must fly before the end of the ban. The airline will allow a dog in the cabin in a soft carrier, if the dog and carrier are less than 10kg. My dog is 7kg so the carrier can be up to 3kg. It must be 27cm high 40cm wide and 55 cm long or smaller problems: the foot print is fine for my dogs they could lay down comfortably, but the height is small. I want to make a telescoping carrier so it can fit under the seat on the plane, but can open up for comfort in the airport and when moving. Any ideas are welcome and I'll post it as my first instructable once I make it thanks

Question by redorchestra   |  last reply

How to change the configuration of a lithium cell pack ?

I’m working on a project were I have to be able to adjust the voltage of my output by 3.7 volt increments. Example: 12 18650 batteries hooked up in series and have the voltage change from 44.4 to 22.2 to 11.1 Essential I’m trying to go from a 12s to a 3s4p or 4p3s cell configuration.

Question by prostructables   |  last reply

Variable 0V-24V, 0Amp-5Amp DC Battery Pack ?

I am building a portable battery pack of 21000 mAh and 25.9 Volts. I need a circuit to vary its voltage from 0 volts to 24 volts, or maybe 1.25 volts to 24 volts and a circuit to vary its current from 0 Amps to 5 Amps. Basically i need a Voltage and Current regulator. for varying current, i was thinking of attaching a potentiometer in series with the output of battery. As the resistance would vary, the current will vary. Will it work? Now i need something for varying voltage..

Question by kool.mukesh