Direction Lens?

Is there a lens that takes all the incoming light and sends it out in one dirction

Question by jj.inc   |  last reply


directional speaker

My neighbours (25m) play music outside every night till 4-5am. The bass is the problem. I'm going insane. Police comes and goes. Need instructions on either option - killing, hijacking speakers or building directional speaker for payback.  Can't spend much and have no knowledge of sound system but have CB in my car, 1200W sound system with wireless rear, sub and amp removed from car. Any help would be great as Im already researching ninja road stars. The bass is so strong I can't cover it with mine.

Question by AgaO5   |  last reply


Train Direction

I wanted to make / fabricate an instrument for my railroad project which will have an input of 220 VAC and out put will be varying between 0 to 16 VDC (Potentiometer) and will have an arrangement to change the direction of train (forward and backward). I will be very much thankful to you for guiding me in this regard by giving me a list of components and circuit diagram thereof. I am having a ready made (purchased from the market) equipment of the same but it has become very old and hence I want to develop myself.With warm regards.Sher Dil

Topic by sher dil   |  last reply


Can I reverse servo direction in Arduino?

On my robot, both servos move clockwise. Is there any way in the  Arduino Environment to reverse the direction of one, to make it move counter-clockwise? 

Question by DELETED_afw11   |  last reply


Compass on a chip

Does anyone know what I need to have a Compass on a chip? The idea is for a horizontal ring of LEDs with the northern LED lit. If the ring turns, the light will chase towards the north most point on the ring. I've found single and dual pole compass chips, but I admit a lot of ignorance about chips in general. Anyone have a shopping list for such a project?

Topic by catalyst   |  last reply


handheld direction finder

Hi - I'm looking for a project to build a handheld direction finder.  I would think you could do this using radio frequency.  Basically, I'd like two parts: the finder and the findee.  The finder would indicated the direction to the findee and that's it.  Not sure exactly what you'd call that... Thanks!

Topic by stevieruns   |  last reply


shaft direction indicator?

Does anyone know an easy way to get/make a simple device to determine the direction of a spinning shaft?  It must give some logic (5V) signal, NOT encoded in any way.  Just +5 if CW or 0 if CCW (or backwards, or 3.3V, or whatever else, it doesn't really matter).  However, it must not A) require any digital controller (no arduino, ATtiny, PIC, computer, raspi, etc.) B) have an "encoded" output, or gray code C) have a large "dead band" where it still indicates CW but it's actually spun a tiny bit CW (or vis-versa).  Must be under 3-4 degrees D) require  the shaft to spin quickly E) be expensive.  This is a prototype for an ANALOG mill D.R.O., so I don't want to have to spend ten bucks on one part that I have to buy several of, plus the other parts.  Its a 1/4" threaded rod, but can easily be adapted to whatever else it needs to be.  The device needn't be small, and I will have a 3D printer avaliable (or at least a mill). 

Question by jduffy54   |  last reply


direct nodeMCU control?

Hi guys this is my first attempt on automation using the nodeMCU lua ESP8266  My goal is to control the gpio via wifi without connecting the node to my home network it should dependent  I have found e bunch of code but it has to be joined to my homework thanks

Question by Conwyn'   |  last reply


Distance and direction detector?

What I want to do is build a device that I can hold in my hand that will notify me (probably with an LED) if I am facing the object I want to find, and preferably how far away I am. I can't use IR because if something is between me and the object I still want to know if I'm facing it I'm not sure what method I would use but I want to build a device that consists of a transmitter and a handheld receiver, I would probably use radio, and the transmitter would have to be very small, (Keychain sized or smaller preferably). 

Question by geekman2   |  last reply


Why does my computer fan keep swiching direction?

Im trying to power a computer fan with batteries for a project. The fan wasn't turning so i tried upping the voltage. Ive tried one two and tree 9 volt batteries in series to make it turn. It worked best with two but the bizarre thing is that ever second or so it stops and sometimes switches direction. the fan has 3 leads red white and black. im powering red and back is ground the whit i think is a fan speed information wire of some kind. im not really sure. Any one have any ideas?

Question by pineapplenewton   |  last reply



How can I turn rotational motion 90 degrees?

I want to connect a horizontal, spinning shaft to a vertical shaft so that the first shaft will spin the second. Does anyone have any suggestions other than a gearbox or pulley/belt arrangement?

Question by rogers236   |  last reply


Controlling servo direction with arduino Answered

So, I'm trying to control two servo motors for a robotic arm. I can't seem to figure out how to make two servos go opposite directions at the same time. This is needed as I have two servos facing opposite directions driving the same beam (If they're told to go the same direction, because they are facing opposite directions, they'll rotate opposite directions). Currently I'm using this code to rotate them both: for(pos = 0; pos < 180; pos += 1)    {                                    myservo.write(pos);                  delay(15);                        } and then using the same code, only replacing the top part with   for(pos = 180; pos>=1; pos-=1) to return to the original position. How do I make both servos go opposite directions though, so they can both be used to lift a beam at the same time?

Question by 0xCyrusx0   |  last reply


Bi-Directional Led Sensing

Hello, I have been working on Bi-Directional Led sensing for a school project. I have managed to build a prototype with just 1LED and a processing sketch to visualize the input which works perfect. Also I built a version with 2 LEDs which is not as good as the previous one. I can get response from the both Leds but they are interfering with each other most of the time. I am using the built-in pulseIn function of the arduino to measure the time of the Leds go from LOW to HIGH. With just one led it is perfect, but when I add more then 1 LED, two or three LEDs , lets say, they go into a weird condition. If anyone have some experience with Bi-Directional Led sensing with more then 1 LED, I will be glad if you share. Thank You

Topic by tolgainam   |  last reply


is it possible to determine the direction a motor is spining by attaching a comparator to both leads?

The motor is not being powered with electricity it is being spun by hand. and if it is possible how can I determine the speed.

Question by evilmadscientistman   |  last reply


would it even be worth my time to make an ible that makes a yagi antenna have not seen a lot of radio lovers on ibles? Answered

I found a really cool way to make a yagi direction finding antenna but i have not seen much interest on the site about radio operations

Question by acidbass   |  last reply


1958 Walz Direct F:Stop Meter

I just thought I would share this cool '58 F:Stop meter I bought at a second-hand store for 50 cents. If anyone has information about this, (value maybe...) it would be nice.

Topic by ItsTheHobbs 


CFL AND DIRECT BOX QUESTION(s)?

This is a multi part question. 1. What normally fails on a CFL bulb? 2. If I scrap a good used transformer from a CFL will it work to build a direct box? I know it is pretty easy to buy a Jensen Trans or other brand new trans for a DI box but how many dead CFL bulbs do you see waiting to be reused or recycled? I would really like to reuse the tranny if possible. My understanding is that heat is causing a great number of the premature deaths in CFL bulbs. see images. Thanks AFF

Question by AFF   |  last reply


Removing potentiometer and making a direct connection?

Want to remove those potentiometer ir order to attach a RsbryPie 3 heatsink to make the IC cool. IT'S a PAM8406,and on it's max load it's getting really hot. So have to apply a heatsink. So is there any​ way to remove those potentiometer and connect those line directly, i mean I'm newbie in this thing. So need some help, thanks in advance.

Question by Sayan_trex   |  last reply


Direct communication concerning membership details?

Hi! I just want to know where I have to go on your website to gain a means of getting in touch ,re.write you a letter concerning any personal questions about my membership, I may wish to ask? For example, If I want to be a paying member,but,at the moment I cannot afford it,however ,in the future I may be able to afford it,...Therefore,what avenue of communication do you have for me to be able to discuss this matter ?   With Kind Regards   Glennbo.

Question by Glennbo111   |  last reply


Basic single direction led chaser

Hello everybody. I am a newbies in this world and I am a bit lost. I want to make a project witch is a single direction led chaser. ( 6 led blinking one after another from one to six then start from the beginning over and over). I found plenty of larson scanner nightrider style but those are all bi-directional. Since I don't know much about it, I would need someone to tell me what hardware that I need and maybe a plan of the circuit. I will use 6  orange ultra-bright  5 mm led  VF: 2.1V- 2.5V    VR: 5V.  I would like to know what resistor that I have to use with this setup. I've read about a 4017 ship but I don't know if it is the one that I need for my project. I know I will need a lot of hardware that I don't know the name and that is why I need  help. It will be on a car so it need to be on 12V. I will have to make my schema on a PCB board 1 inch X 10 inches. It would be good if i can adjust the speed too. Since it will be a car blicker/flasher, I don't know if I need to use blinking led or if regular bright led will do. Sorry about my lack of knowledge(and my bad English), I am sure that I forget to mention a lot of detail so feel free to put me on the right track. Thank you for your time people Rick PS: In the picture, we aiming for the 6 orange led. they have to blink one at a time from the left to the right over and over.

Topic by rbrunet   |  last reply


Xbee direct input - without arduino

Hello! I recently purchased two XBee Series 2 modules for a personal project. I did everything I wanted with the arduino connected directly to the sensor but I want to try remote signal processing. I want to connect an analog sensor (or digital) to one of the XBee's pins and with the other Xbee connected to an Arduino , where I want to process data from the sensor. All the examples found on the net are made with XBee Series 1 but I hope someone still managed and XBee Series 2. I would be interested configuration made ​​with x-ctu or terminal. Thank you!

Topic by didrau   |  last reply


16x16 LED panel direct control

Hi all, I got 10 LED panels of 16x16 LEDs each. Now I want to create a big modular display system with these and I'm also planning to post this on the instrucatbles website once I succeed. But I have some problems getting started. I spent alot of time reading all LED matrix related topics on the website here but none of the designs matches the fixed design I have on those panels. Instead of using some sort of multiplexing, 32 shift registers are used for 256 LEDs which means every LED has it's own shift register output. Put then again, I also find 3 buffer ICs on the panels and I have no idea where they are used for... Below the info I have now: 1 PANEL: - 16x16 yellow LEDs - 32x M74HC4094B1 8-bit shift registers - 3x 74HC125N Quad buffer/line register, 3 state Pictures: http://www.myalbum.com/Album=64MKOUJR First I want to work with only 1 panel and be able to control this by putting images on it. But for this I have to understand completely how the hardware is built up so I first want to create the schematic of 1 panel. Can somebody help me with this and get me started on the project? First goal: just control 1 panel with an AVR to put some text on it and let is scroll. Final goal: be able to connect multiple panels and configure the software accordingly to the panels used. Then use a PC to put images on the screen and maybe even create a live feed (webcam capture). For this maybe an FPGA should be used to have more processing power/memory. Many thanks already in advance!

Topic by kris_ge   |  last reply


An idea for highly directional and loud loudspeakers

I am currently playing around with vibration experiments.Mainly in the ultrasonic range though.But when messing around with some vibration speakers I found a not so well documented misuse for themEveryone wants a big TV these days but once you have it the sound often turns out to come from a tin can.Those with a good entertainment or at least stereo system won't mind hooking the to it.The rest usually opts for a sound bar or how I like to call them shredderbox.Sooner or later they just fail to produce the sound you had on the first day - or they cost a small fortune.What is the secret to a powerful speaker?Firstly efficiency.Secondly the design.You need the right material to produce a more or less even reaction at all intendet frequencies.The design makes sure those frequencies that need extra attention get more volume output, like by using a little pipe for the low frequencies.Some even include a dedicate speaker for these low volumes.What if you could just build you own soundbar on a budget?If you have a failing soundbar with the actual speakers as the problem you could salvage the electronics.In case you can make do with headphone input or RCA connections than any cheap amplifier will do.Leaves the speakers...Vibration speakers are still underestimated for their uses...I tried the the usual approach of using a glue on vibro speaker:Place it on surface tha gives a re more or less decent sound.The thing is though that there is no ideal surface for them.A table can sound like the highs are missing, a hardwood desk might not produce any low frequencies while a window or plaster board wall bring the problem of wiring and vibrations.To check the reactions of sound on different media I, one day, mounted one speaker under a big tin can.Right in the center.The fun hit me when my tests with water were over and tried to play a song with the empty can.Of course there was some degree of tin can sound but the directional qualities together with the wide frequency spectrum made me experiment.The key is to find the right material and shape!You want something that is hard enough to vibrate properly but soft enough to allow for lower frequencies.I tried pipes, boxes, old plastic containers....But nothing seemed to provide a broad and even sound spectrum without distortions.If you vibrate a surface then only at certain, resonant frequencies destinct patterns will form if some dust or similar is place on the surface.In all other cases there is only chaos.Preventing the harmonics to form prevents harmonic vibrations to build up to distortion levels.Like it or not but waste seems to work just fine as a speaker ;)I made a plug to fit reall tight into a 2 liter juice bottle neck.The original plastic cap is just too soft.A vibro speaker glued onto the plug and the bottom of the bottle cut out and the soun was quite impressive.Proper use is however limited as the speaker would need to be mounted upright.Next thought was to utilise the bottom of the bottle too.By cutting a round hole in the side of the bottle I got an even more directional speaker with a better response to low frequencies.Placement of said hole of course affect how certain frequencies travel and where nodes can form.The size might also matter as the hoe itself, or better the material around it can get resonant at certain frequencies.You can cheat at bit though by using sticky tape, duct tape and so on as dampening meterial in badly affected areas.Especially with a wall mount for the speaker and the bottle hanging down behind the TV the effect is good compared to a standard shredderbox. The above design is certainly not for everyone although I think it has a wow factor to it if you show a decent sound coming out of a juice bottle ;)My next step was trying to find out how more fancy designs could work.So just stop reading here unless you like the idea of creating speakers that should not even work.Back in the old days we had more than just the speakers with magnets and cones.Anything that can vibrate can produce sound.It all depends on how much of it we can actually hear.My first exotic idea to really misuse a vibro speaker is a vibrating harp.Does not need to be in the classic shape though.A string in a resonance box, like a harp, guitar, violine and so on will start to vibrate at the set note.This is true even if the force for the vibration is external.You might remember the old school experiment with the two pitch forks on their boxes?Hit one and the other starts to swing too.If you make a resonance box for a vibro speaker with internal or external wire strings at different tensions or lengths you can amplify the sound for the notes that correspond to the strings.Make a relatively large box with some sturdy wires for the frequencies between 60 and 100Hz and you have a really powerful subwoofer from just 20W of input power...I think you get the idea on how to use amplifying strings now ;)My second and total misuse is the xmas tree.If you are a sparky by old trades then you might remember the mechanical frequency meters for generators or other things that required a stable supply.Well, if not than you should know the little wind up toys that play a melody with a drum and tiny forks.Imagine you would replace the glue plate with a rod.Depending on material and length harmonic nodes will form at various places and frequencies.Between those nodes the swing is maximised while the node itself appear to be stationary and without and vibrations at all.For example a steel rod of 1.2m would have a single standing wave at about 1kHz while a copper rod of the same lenght will be much lower in the frequency for a single standing wave.The xmas tree assumes that the rod is of such material that no single standing wave can form below 200Hz and that it won't swing too much at other resonant frequencies.Since aluminium is easy to work with and available in flat and thin bars already it would be my first choice for the branches of the tree.The required length is calculate based on the speed of sound in aluminium - you find online calculators for that.You want the lenght so that you end up with an even fraction of the wavelength you want to "play" with that strip.This allows for the rod to be placed right in the center of the strip where the standing wave movement is zero in the node.Make a lot of thin strips to get a broad frequency response.Placement on the rod can now be crucial.The best option I found so far is using a threaded rod and tapping the holes in the strips.The strips swing quite violently if long and at certain frequencies.And those not in resonance will still transfer their momentum to other strips.This can cause unwanted harmonics.Most evident when a single strips swigns violently at a certain frequencies.Adjusting the angle by turning it is often enough to get out of the overlapping harmonics.With enough strips it then really looks like a tree with flat branches.The sound might not be as loud and impressive as a plastic bottle as the virations are going up and down.But if placed in the right spot it not just looks nice but also makes people wonder where the sound is coming from.Last but not least my yet to be tested hidden speaker system - due to renting restrictions :(If you own a house of the standard frame design then you have plasterboard walls and ceilings.With a large enough surface of the right material, one or two vibro speakers can cover a really wide frequency range at good volume levels.So far I could only do tests in an old wooden window frame but the priciple works the same way between the wooden frames of a wall or ceiling.In my experiments a standard plasterboard sheet needs to be 100 x 100cm to get a more or less decent response for the lower frequencies.Before you rip your walls down use a stud finder and place your vibro speaker on the plasterboard between two studs or beams.I found that two speakers for the lower frequencies and three or four for the higher ones make a good sound.That is per channel and if you have the right size plasterboard sheet in the right place.No point if your left side is further away from the TV than your right.Ideally you replace the entire sheet with the speaker in the right spot on the new sheet but on the back.For obvious reasons this is far from being a perfect solution.But if you plan a full renovation anyway...A way out for older houses is the wooden floorboards.They make excellent resonators for low frequencies.The directional speakers could then still be hidden in picture frames of the right thickness and design.Anyways, I hope I gave you some ideas here ;)

Topic by Downunder35m 


single phase ,brushless direct current motor.

Does anyone have the schematics for a VERY SIMPLE, (LIKE ME) single phase brushless DC motor.

Question by ianrbell   |  last reply


how to make a direct mic to speaker setup?

I am trying to run a microphone directly to a speaker and I am having some troubles with how to integrate battery or 12v DC power into it. Any suggestions would be greatly appreciated.

Question by nrepak   |  last reply


Unable to reverse direction of servo using arduino

I have arduino and a perfect code for moving servo to bidirection, but now i have facing problem of reversing the servo. I have replace three servos but having same problem. please help to detect is there is error in my arduino or servos?

Question by akshaydodkade   |  last reply


Google Jump/Re-direct &quot;Virus&quot; Help!!

Has anyone else had issues the last few days, with an Adware/Trojan which re-directs links and addresses? I have delt with them before yet this one seems particularly nasty. Not only does it re-direct every link in all search engines to random sites it also blocks many if not all sites associated with adware removal tools/tech support etc. Example: HJ this is not attainable to send techs logs. I can't get to my email because hotmail.com wont open. It begun as just a simple re-direct script but it seems the sites which I have been re-directed to are flooding my comp with ad-ware/fake virus removal tools/security warnings. One of the spawning virus's has managed to remove my "task bar" and "My computer" from the desktop. My comp is just spawning trojans and adware at the moment, every time I do a full scan there is atleast 40 more spawned by the time it is finished (15min). At the moment the only thing I have is Super Anti Spyware, which the guys there are obvious on this as their 15min updates seem to be catching the new creations... But I'm fighting a loosing battle here... I know it is probably beyond most here to help me, yet I was more interested to see if any one else has been affected, as the site that I can get to for tech assistant is flooded out with... "Another Google re-direct Virus Help!" in their forums... Google has to be PO'd about this one.

Topic by Lftndbt   |  last reply


Electric Standing Desk Controller for Direct Control?

Does anyone know what the controller is for most of the electric standing desks? I have a Jarvis and it seems that it uses the same controller as the GeekDesk. The box appears to have an RJ11 serial connection that is not used in the desk operation, I am wondering if that is whats used to program the controller board, and if so perhaps I can enable direct serial control for setting desk heights from my pc. Has anyone tinkered with this by chance?

Question by jeyton   |  last reply


run car radio direct from battery

Hi ppl, I'm new here,been looking and d.i.y.ing since i found it. I have a question for any1 that has done this b4. I have a car radio, I have a battery, I have speakers, I have a shed to put em in, but how do I connect a car radio direct to a 12v battery? I have wired old ghetto blasters up to it, blown em all up like, so this 1 HAS to work lol. Any help appreciated, but would love diagram lol. Thnx ppl.... P.S. I might also need to know how to wire up the speakers.....

Topic by metalmark   |  last reply


How to make a direct microphone to speaker circuit?

Hello all, I recently wanted to develop a circuit which picks up voice signals from a microphone and outputs it to a speaker. As I recently started learning to build circuits, I was hoping to get a few inputs and tutorials on how to build one in a step by step manner. Please help by giving instructions and not a circuit diagram as I am still learning. Thanks for all your help! Regards, Microtest

Question by Microtest   |  last reply


Rotary switch w/ direction based contacts??

I'm looking for a specific type of switch... I believe that it must exist, but I have never seen it... I need a rotary switch, where each clockwise "click" (partial turn) makes one circuit momentarily, and each counter-clockwise turn makes a different momentary conection... example with two light bulbs ( L1 and L2 ) connected to each direction of travel, respectively: If you rotate the knob one "click" (say 15 degrees) clockwise, L1 flashes for a moment, as the knob is in motion. if you continue clockwise, L1 will flash at each "click". If you rotate the knob one "click" counter-clockwise, L2 flashes for a moment. if you continue counter-clockwise, L2 will flash at each "click". There is no center-point, so any clockwise travel corresponds to L1, and any counter-clockwise travel corresponds to L2. does anyone know where I could get a couple of these??

Topic by gschoppe   |  last reply


Stepper motor vibration/lockup with driver? Answered

I am trying to get a stepper motor to turn using a StepStick driver from Botronicz. I have gotten the driver to work once before, but now it has decided not to work. I have wired my stepper motor (Model STP-42D3018) according to any specs I can find online in a bipolar connection, but when I fire it up the stepper only sits there and vibrates. Or misses steps (depending on voltage). A few other times I had it also where it would step one direction for I think a single step and then step back the other direction. It is really bothering me because I have tried multiple other wiring combinations and have not gotten any of those to work. My current setup is exactly like this (I have checked numerous times). I have also tried changing the vmot supply voltage and current limit, as well as the current limiter pot on the board itself. If anyone can help it would be greatly appreciated! Sincerely,  A907

Question by astroboy907   |  last reply


I want to use a very simple circuit to start, stop and reverse the motor. Does anyone have any idea of such a circuit ?

We are currently doing a project to retract a certain beam and to extend it. We require a switch to start the motor to extend the beam, stop it and retract the beam when needed. The stopping part would be automatic. The start can be activated from a switch and the reverse switch would be connected to our previous circuit. We really need help for this motor circuit.

Question by rukesh   |  last reply


In need if some direction for GPS tracker and app builder

I am looking for someone to give me a little bit of direction or reference as to where and or how I can find someone who can create a GPS tracker or tell me how to buy them in bulk..... Also I am looking for someone who can design or create an APP for smartphones. 

Topic by hansen413   |  last reply


How to and which direction to connect a resistor in an audio amplifier? Answered

Please there is this audio amplifier i have been working on, but have not been successful with it. i did check to make sure all my connections are OK. but what i am confused about is " dose it matter witch direction i connect my resistors" secondly "does it matter if i connect the resistor directly on the transistor collector arm or those it make the same if i use wires to make a longer connection? thanks. can anyone help?

Question by RdNard   |  last reply


Apparently no direct relationship between Brix and water content???

Could anyone explain to me why there is not a direct relation between the Brix scale and the water contents scale on my honey refractometer? At the low end of the Brix scale (60-70), the match is perfect, but not at higher Brix. I suspect this has something to do with the fact that there is a non-linear relationship between sugar concentration and density. It would, however, be very nice to know the proper theoretical background... :-) Any help will be greatly appreciated, as I have been unable to find any information at all on the web. Thanks!  Best regards, tome

Question by tome   |  last reply


How to coneect LED Strip to PC Ups direct.

How to connect a LED strip directly inside to PC UPS Battery (12v)  presently the LED strip needs a 12v adapter for connection directly to main power supply 220v AC. but i want to connect it directly to my spare PC UPS, so that a get lights uninterrupted by power cuts. #draw 12v from UPS battery while charging. please guide. Rupesh 

Question by Rupesh KR   |  last reply


I have a burned diode with no markings any direction?

This analog multi-meter has a bad diode I cannot identify. Can anybody help?

Question by bigcape   |  last reply


Basic DC (direct current) theory and practice for newbies

Hey everyone, as you may have guessed - i'm a newbie to DC theory! Backstory: after graduating i said 'forget it' to a proper job and moved to Australia to travel. i bought a converted camper van that has an auxillary battery for (whatever), and it looks like it runs off 12 volt dc! the Question: how does DC power work, for me and all those newbies out there putting along on the other side of the planet! -cheers, adrian www.bigquestionmarks.blogspot.com

Topic by adritek   |  last reply


Wiring high power LEDs and need some direction.

Hello all, I am currently trying to design a product, we'll simply call it a light, that requires 6, maybe 7 extremely bright LEDs. I'd like to keep it running off a 3v battery. The LEDs I would like to use are made by Cree (XP-E2) or something similar. The specs can be found on this page:  http://www.cree.com/led-components-and-modules/products/xlamp/discrete-directional/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/Data%20and%20Binning/XLampXPE2.pdf My question is, will I even be able  to fully power 6 of these things off 3V or even 6V(I'd rather keep it to 3V)? If so, how long can I expect the battery life to be? I've never had any experience with these high power LEDs before, but all of the other SMD LEDS only light to ~40 lumens. I'd really like to make this work, or find a similar alternative. Thanks in advance.

Question by bodezia   |  last reply


can i boost wifi with outside hd directional antenna?

I have a cricket modem and a outdoor hd directional antenna can i somehow run coaxial cable to modem and get a better signal? If not . what is the best way to go about increasing signal strength, while being cost effective?

Question by    |  last reply


how to maintain the intensity of IR at long distance and make it directional

We are trying to make an infrared shooting game which includes a transmitting gun and a receiving jacket.as everyone knows IR is not directional so at long distance it will diverge but in shooting game we need a pointed IR beam. is there any technique implement this?? we need help..! :(

Topic by FypB   |  last reply


how mobile phones convert Aternating voltage to direct voltage?

There is no big transformer in a mobile phone charger but still it is able to convert A.C to D.C though it is small

Question by deepakmurali   |  last reply


Direct connection of 5V from power supply to front USB

Hello, I need to charge some devices via USB, but my computer seems to give less than 500mA, so charge takes 12 hours... I have one unused front USB on my computer, and I would like to ask if it will be a good idea to solder the pins 1 and 4 of this connector, directly to a connector coming from the power supply to get 5V but without the limitation on current. Any comments will be appreciated. regards, Angel.

Topic by angel6700   |  last reply


Push button to toggle servo direction - monostable 555 circuit? Answered

I would like to build a circuit where I push a button once and a servo moves 180 degrees and stays there.  If I push the button again it should move back to the start position. A switch is good alternative, whichever would be easier. I've been looking at circuits to do with 555 timers and servos and have found these two which seem useful: http://www.555-timer-circuits.com/servo-controller.html http://www.dummies.com/how-to/content/electronics-components-555-timer-chip-in-monostabl.html Is that second circuit what I need?  How would I change the direction of the servo each time it runs? I looked into flip-flops such as the 4013 which came up as a suggestion instead of a 555 but quickly got out of my depth.  I'm happy tinkering around with electronics but unfortunately don't know too much of the theory...

Question by Sparrowhawk   |  last reply


Can I use the battery charger as a direct power source?

I am making an automatic button presser for my Nikon CoolPix 4800 camera so I can make time lapse videos.  My problem is that I don't have a power adapter for my camera.  If I connect the battery charger directly to the battery slot in the camera, will the camera run safely? There is a jack on the side, but it's a strange jack that I have never seen before.  The jack is listed at 8.4V. The charger has an output of 8.4V and 600mA On the bottom of the camera, it says: 8.4V ---- 0.4A 6V -----0.6A Then, strangely, the rechargable lithium-ion battery says 7.4V, though it could be a typo. So, if I connect the terminals on the battery charger into the terminals in the camera where the battery hooks up, will it run safely? Thanks!

Question by Wehrdo   |  last reply


salvaging color displayscreens for other projects i need direction.

I have a picture here for you, I want to know how I would go about removing the lcd from this picture for other project displays. but I have never conceived of such a thing I need guidance and some tips and tricks. I am savey to several forms of backward engineering, as I said nothing like this though. I have no clue how to start. I would like to salvage it for easy use across multiple platforms weather be arduino, raspberry or custom boards. ( don't even know that's possible)

Topic by CD_tatro   |  last reply


Using direct AC power instead of DC from rechargeable battery

I have a hair trimmer, that works on rechargeable batteries. Now the batteries has died, I want to make it work directly through AC connection, instead of using the batteries. Can someone please help?

Question by anoop54451987   |  last reply


computer fan mod ???? will reversing fan direction cause overheating etc?

I have an older computer, and i was thinking instead of buying a new fan and installing as an out-take, what if i just reverse the one fan i have to pull air out, instead of running two fans.. would this cause overheating or any other problems, or would it provide better airflow in a "vacuum" effect for the computer. i only have the one fan in it right now.

Question by bradburyk   |  last reply