Platinum and fuel cells.

A couple of questions: 1) Does anybody know where to get cheap platinum wire (or platinum coated wire) 2) Does AC work better than DC for electrolysis because neither of the poles will corrode. 3) fuel cells produce around 2 volts, right? 4) Is there a cheaper alternative than platinum for converting hydrogen (and does it need the oxygen?) into water and electricity?

Topic by guyfrom7up   |  last reply

Current measurement with arduino

Hey I try to measure current with hall-sensor amploc 25A, it sense magnetic-fields, offset voltage is 2.5V and I use arduino uno. I get 519 value from analog pin and 37mV/A is hall sensor sensitivity. My formula is outputValue = ((((sensorValue*5000.0)/1023.0)-2500)/37 multimeter shows 0.112amps when I put load but I dont gett correct value on LCD Is my formula OK?

Topic by mattilaniko   |  last reply

Monitor powered by ATX

I searched for hours with varying keywords and can't find too much information...  12v to pin 1 and GND to pin 2 but what do I do about the neutral? I read a xbox 360 laptop mod but it involves the 5v too, and connects it to the power brick. I'm trying to do something different. Trying to make a lunchbox out of a macpro 1.1 case. 1 wire to plug into an outlet is better than needing two. Before I get into this project im trying to understand what I need to buy and feel kinda silly asking such a question which should be extremely simple but I want to be safe and dont want to fry anything. For those that are actually interested in what I'm doing, I kept staring at the case thinking "what can I make with this, and the items I have laying around?" I thought I'd 1-up the basic hackintosh build and go against the grain of using the case how it's intended. I flipped it so the side with the I/O ports were sitting flat, measured the inside which gave me 7" of workable space with 0.4" wiggle room which made perfect for an mini ITX to be laying flat down instead of against the wall. I thought I could take my dremel and cut out an area for a LCD monitor. I have enough DVD drives laying around as well that I could make a "push tray to eject keyboard" sort of slide out keyboard upgrading the rails, using an ultra thin keyboard with a track pad and top it off with sound activated lights and my 1.5 TB HD that's almost full of music. I realize I can do this with a laptop and pocket usb speaker/light effects, but it wouldn't be as cool and I wouldn't get to reuse these items I have sitting around.

Topic by bvarious   |  last reply

Flip flop?

Hi, I'm a little rusty in digital electronics, does the attached diagram represent a flip flop? I need a logical circuit that change state (output: from 0 to 1 and vise versa) when triggered (pulse). An I.C. number would be more helpful. Thanks!

Topic by Control80   |  last reply

Nintendo DS Lite Not Working

So, I have had my Nintendo DS Lite for a few years and used to play it a lot until 2011-2012. I finally decided to start playing it again a few days ago when it stopped working. I know it isn't dead because I charged it completely before trying to use it. When I turn it on, the green light turns on but the screen remains black. Also, the screen has turned on once or twice but it's currently not working.

Topic by KristenB2   |  last reply

AC187 Transistor Alternative???

Hi I was wondering if anyone knew of any Silicon or Germanium alternatives to the AC187 Transistor. Also is the BC548 or BC547 Silicon Transistor an alternative to the AC187 Germanium transistor?  Thanks in advance

Topic by Ikram1ali   |  last reply

Any way to fix delamination?

As you can see from the image, I accidentally ripped off a copper pad on my PCB. This is my first time really soldering anything, so I somewhat expected it, but still... Is there any way to fix it? I can't really seem to find too many solutions. 

Topic by The Manic Puppeteer   |  last reply

Replace Samsung Galaxy S2 Glass Screen Cover

How can I replace the glass screen cover on my Galaxy S2 (GT-I9100M)? The LCD and touch are fine just the screen cover is totally cracked! The phone is usable, just not pleasent with a cracked cover. I can buy a cover on EBAY for $5, but I have no idea how to replace it. Can anyone help?

Topic by DELETED_bertwert   |  last reply

trigger momentary switch/button via switch

What i try to accomplish is very simple. my Airconditioner has a Push button (momentary switch) to turn it off and on. but the Thermostat brings permanent power it it want the A/C to be on. i could make a simple delay setup for 1 sec. or so to trigger a relay but then i can't be sure its really on or of. how can i ensure its turned on via an timer relay safely if the control wire has power ? any recomentation on existing products or schematics ? i can check the "real status" via other parts on the airconditioner easy .. i just need a way to ensure ON and OFF based on the command line is High or Low ..  any ideas ? 

Topic by nullx8   |  last reply

how to make an isokinetic

Hi every body i want to design an iso kineticsystem for body building gyms... Isokinetics means exercise performed with a specialized apparatus that provides variable resistance to a movement, so that no matter how much effort is exerted, the movement takes place at a constant speed... i don't know how can i make a mechanism that it can make a resistance for the same speed of machine because of my field of study is computer but i had to design a isokinetics machine... but i think that it can be in some path: 1) it can be electro mechanical by using a DC motor with some gear. 2)it can be made by a cylinder that it has a little hole,and we can move oil into the cylinder by cylinder movement but oil moving happened with same speed such as car Shock absorber. 3)etc... please help me for design and make an isokinetics. this is my mail: i waiting for your helpful proposal.

Topic by sina majidi 

Advice on building an autonomous sentry camera w/ laser

I'm looking for some help/ advice on building an autonomous security camera that tracks moving object with a laser. much like this instructable, but with a laser instead of a gun: as a bit of background, my house was recently burgled. ive now had a normal security camera installed on my house because of it, but would like something a bit better. i dont have that much knowledge on building electronic things (as i dont know where to start), so i am also looking to learn some things while i build this, instead of just following instructions and not knowing why im doing something. so first question is where can i learn about the basics? or would it just be a learn as im doing kinda thing.  as for the actual sentry, i was looking for a little advice on how to build it as it wont be exactly the same as the link above. for starters i would like to use a laser instead of the paintball gun. this is mainly as a deterrent as i would assume someone is less likely to try and burgle their house if they know they're being watched/ tracked.  the camera would also need to be a better quality one than a webcam, and would also need night vision. i dont really know how a different camera (not webcam) could be set up. building on this, could there potentially be issues with tracking at night? when its built it will also be on all night every night, and mounted to the wall. what would be the best way of having it all mains wired as having to replace the servo batteries will be a massive pain in the ass. i understand as i dont have that much knowledge atm that this will probably take me a while to build and perfect, but any help with the above points would be greatly appreciated! 

Topic by scott08   |  last reply

unable to open pdf

My customer has recently encountered a problem when trying to open most of their pdfs that they have been referencing for years on their pc.  Reader has a popup box that says "Adobe Reader could not open 'file.pdf' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded I have tried various programs to recover/restore/repair them, they all say the files aren't PDF files.  I have not paid for any recovery programs but would be willing to if they can demonstrate they can fix the problem first.

Topic by HanaB   |  last reply

36Vd.c. @ 8.3A Power Supply + Buck Converter

Hello Friends, I have a 36Vd.c. @ 8.3A Power Supply that I would like to convert into a Variable Bench Power Supply. After researching the topic, I have decided on choosing a Buck Converter as opposed to a Linear Regulator.  Shopping around online, I stumbled upon the LM2596 Converter:;=item462bb7a8a5                      Any thoughts and or suggestions? Beyond that, I do have a general question... I've read on a few power supply instructables that it's recommended that all rails be used (for example all yellow/12v cables) to insure a more steady current. Now being that the max output of the above mentioned power supply is 8.3A and (please correct me if I'm wrong) according to the supplied spec sheets, power is coming from 3 rails, would it be safe to assume it not necessary to feed all rails into a buck converter since its output is only 2A? Please put me in my place...

Topic by davidkiyan   |  last reply

Electronic catapult?

Okay. I'm going to make an electromagnet to hold the spring in place while it's compressed, and then as the power turns off, the spring will release and shoot the catapult. However, I'm not an engineer-- I'm making this for tech class. How should I design the catapult so that this will work as a triggering mechanism? In what way should I set up the spring and electromagnet relative to each other? Thanks in advance.

Topic by camiheall   |  last reply

I2C in arduino

Hi, I am trying to connect two arduino UNO together. Lets call one U1 and the other U2. U1 is master and U2 is slave. Now I want to attach a wave shield to U2 which is slave and operate it from U1. Is that possible? If it is possible, then can I use any pin to transmit and receive signal?? Cause in some forums they say that I2C is done by using digital pin 4 and 5. However, these pins are taken by wave shield. So please help me out in this.

Topic by Bam Boy   |  last reply

How can I get a loud alarm?

Ok so I need an alarm for my project, a very loud alarm. . . And I can't seem to get these dumb buzzer to output a decent sound. I have a lipo checker that uses these type of buzzers  and they are ear shattering. I tried putting the regular buzzers and the were no where near as loud. Also if I want to use the tone function on the arduino, how do i make the buzzer louder?

Topic by HavocRC   |  last reply

power up an MCU using another MCU

Dear all, Here is a concept i would like to prove. I am hoping to power up a microcontroller (MCU) using another MCU. The reason is I would like to make multiple replicates of a base circuitry and connect them to each other, two by two. The catch (what i think would be the catch) is to power up the second one using the first one. I am not sure how this would be possible!? would i be able to change the use of two i/o ports to have both the power and data RX/TX ing? Any help is very much appreciated. Regards, KarimS

Topic by karimskarim   |  last reply

I need help learning to hack a kitchen scale using ardruino's redboard

Hey! My friend is on a very tight deadline and does needs help getting a project done! We are having trouble hacking a kitchen scale using our redboard ardruino device. We are trying to be able to read the scale through the ardruino device! Please point me in the right direction or can someone display to me how to connect a 4 wire load cell to my redboard and breadboard! I am unsure where to place the resistors and where to connect each additional wire needed.. I am completely new at this and would love to set up the redboard for my friend! Please help as soon as you can! Thanks for your time! I dont know where to place my e+, s-, s+, e-. Please help me come to a conclusion on how to get this scale connected correctly to the breadboard and from the breadboard to the red board!!

Topic by Montana32   |  last reply

Big project, little parts..Need serious electrical tech help.

Well, long story short in my dumpster diving salvaging e-waste ... 2 Lorex CCTVs. One cord cut, the other intact. I disassembled the cut cord. Lr38603A PCB. Wires Identified GND 12v+ Audio Video  Analog, so USB is out of question. Acer Aspire 5100 laptop. The mommy is toasted (cause mobo sounds so geefy.) so disassembled and salvaged usable parts.I think I tossed the condenser into my "melt parts off circuit board" bin... so I need a condenser and PCB controller which leads me to something I found in my parts bin... CRT monitor, stripped and kept the  VGA PCB, unfortunately it does not have an S-Video and I think it's irrelevant here but I'm quite new to this hack n mod stuff... So, here's what I'm trying to do: Use the LCD from the laptop as a display for the analog camera, I also have several lens and such from damaged optics (hunting scopes, monocular etc) so with the lens I'll put them in a tube and craft a digital microscope. I know you can buy a cheapie USB one, but I want the pride of making something, to be able to understand the tech, and also re-use discarded electronics. I have a pretty good idea of what to do, but I've never worked on anything that involves a serious power source from an outlet and do not want to fry myself, and would like some guidelines/what to research. Google is not being helpful and nearly all the camera hacks I've came across are for USB based cameras. I have access to a solder station, voltometer and a slew of other parts from various electronics, mostly VCR's I'd like to keep the spending to a minimum, but not at the expense of safety. Can anyone help? Thanks :D

Topic by bvarious   |  last reply

Will a 49MHz transmission work underwater?

I'm building a small device that needs to go to a depth of only a few feet in swimming pool water (I'd say three feet at the most) working on an arduino. I wanted to make it radio controlled and was planning on using a standard 49Mhz RC car circuit connected to the arduino. I don't want to keep the antenna above the water line and was wondering if a 49 MHz would work underwater.  I know higher frequencies like those in Bluetooth don't work underwater.Preview Topic

Topic by sidgupta   |  last reply

How would I connect a GSM SIM900A v3.1 with Arduino UNO?

How would I connect a GSM SIM900A module with Ardunio Uno This is an image of it:

Topic by ahmad.almasriTTu   |  last reply

An illuminated light switch that will work on 120/240V AC.

I have a fluorescent light fixture that my dad gave me, it was about 9 feet, so I cut it in half and re-did the wiring so it would fit on my workbench. It uses a plug to turn on and off. I know the wall switches they sell at home depot are rated for 120/240v but they are cheesy looking and hard to locate in the middle of the night in my garage. When I come home from work on my motorcycle, I need an immediate source of light. Is it possible to use an illuminated switch, say from, Oreilly's or Advanced Auto parts and add some form of surge protection so it won't blow or pop a breaker? I want to use the same concept as a surge protector, it uses an illuminated switch, but only cause its components are protected by the surge. Is it possible to make my own involving soldering components on PCB?

Topic by bprins   |  last reply

Power wheelchair controller testing

I just bought a VR2 controller and I want to know how to bench test it to make sure it is functioning properly before I resale it. I do have a good multimeter.  I just need to know which studs to connect the MM leads to on the controller and what readings I should supect to get.  Thanks again for the help?  Manpan

Topic by themanpan68   |  last reply

ARDUINO codes for replacing/rewriting of data in SD Card

Can somebody help me to write codes for replacing/rewriting of data in SD Card? Please. Thank you!

Topic by deseriem   |  last reply

Where to get buttons like camera shutter buttons?

Where can I get buttons like shutter release buttons? Half press, then full press.

Topic by DELETED_bertwert   |  last reply

Raspberry Pi

Hey everybody!  Do you like pi?  More specifically, Raspberry Pi? Well I made this to you can get help, share ideas, and chat about it! 

Topic by nancyjohns   |  last reply

Square Capacitive Touch RGB LED Buttons

I'm having a hard time finding parts like these - is anyone aware of an RGB LED capacitive touch button?  Preferably with the light and the touch sensor separate (DPDT-type, perhaps?).  I'm looking to make a physical prototype of a mobile puzzle game I'm working on, and this would be an ideal input method. Thanks! -Jesse

Topic by xepherys   |  last reply

Simple PIR circuit, need review

Hi, I'm working on a simple circuit. The idea is to have a portable device that lights up when I stand up at night. I have a PIR sensor that triggers 3 LEDS. I use a LM741 as an OpAmp The leds are type 3528. Though these LEDs are supposed to be powered with 12v, I'll use a 9v battery. My main concern is the battery life, tha'ts why I use 100k resistors in stand-by, to limit the current. R3 is used to fine-tune the threshold on the inverting voltage. PIR outputs:    3.3v when it detects motion,    ?v otherwise (but yet >0) Could anyone give me some tips or advice on how to improve my circuit? Thanks, Antonio

Topic by stills   |  last reply

Audio Contest Judging 3 Days Late

Does anybody know why the audio contest judging time has lasted three days later than expected?

Topic by r2pen2   |  last reply

Scores for "Dinosaur Run"

Still don't know how to play Dinosaur run? Click here. This is a page for posting highscores.

Topic by Luigi Pizzolito   |  last reply

Debounce arduino push button sketch

Hi, I have done the following sketch and wiring, i have tried all sorts of Debounce code in the sketch but can't get it to stop. Most of the sketches i have read and tried switch the led on with one push and off with the second. i just want it to stay on while being pushed and go off while not being pushed, i am working towards RF or Bluetooth but not until i stop this bounce!

Topic by Senken   |  last reply

Arduino PCB Board Layouts

I thought I might share some the circuit board layouts (Top and bottom) of several Arduino boards that I've created. They could be used to etch your own board or just used to compare sizes. I created them from the eagle files provided from the Arduino website and exported each layer in monochrome with help from this Instructable. Automating Eagle export and preparing it for printing by truhlik_fredy To create your own PCB layout on eagle i found this Instructable was the most helpful Turn your EAGLE schematic into a PCB by westfw Download Eagle for free here The File is available as an Adobe Illustrator file and as a png

Topic by MrSirLRD 

Generator from scooter motor

This project came about because someone cut the power line going to my house. The power company was slow to fix it, so I cobbled together a way to charge auto batteries for my invertor. The generator is the motor from a discarded electric scooter ( model MY1016 from JX Motor Co., rated 24v input and 2750 rpm). I removed the motor, it’s drive chain, and sprocket wheel and attached it to the frame of a discarded bike. The pictures show the details. By cranking furiously, I can charge a 12v battery with about 3/4 amp of current. There is a small epoxy rectifier to block the battery from driving the motor. This thing was made from parts on hand and cost me only the assembly time. I don’t have any sources or price lists.

Topic by ShutterBugger   |  last reply

Solar Panel for Water Feature Pump

I'm looking for some suggestions to run a 12v/3A bilge pump in my outdoor water feature using a solar panel.  (This particular bilge pump has a built-in float switch to shut off the pump should the water level drop too low).  Solar is my preference because it'll only run during the day. 1) What size solar panel would I need for this?   Most are described by voltage and watts of power (24V, 10W).  I currently have a 24V/10W panel I'd like to configure for this but it's specs only show it producing less than 1 amp. 2) Should I look for plans to build an DC/DC converter(?) to limit the voltage to 12v? 3) Is there a way for me to boost the amperage? Thanks for any help, links, or suggestions! Dave Nagy Florida

Topic by DaveNagy   |  last reply

DIY 130-megapixel camera built with a scanner

Add an old flatbed scanner to a 50 mm lens and with some skill you can make a 130 megapixel camera of your very own. I'm still happy with the cameras I have, but this looks like a great project to take on. Making a 130-megapixel camera from a flatbed scanner and an old camera lens

Topic by fungus amungus   |  last reply

Interface RS232 to 12 Volt One Wire

I am interested in a circuit to interface an RS232 to a special 12 volt ONE-WIRE circuit.  It is special because it is an controller used in industry.  So I have a MAX3232 to convert my Arduino to RS232 levels, but that will get me to 2 wires.  I need to be able to make that into a ONE-Wire at 12 volt levels (not 3-5 etc) .  I see the MAXIM circuit (attached) for converting to one-wire at lower levels, but can't find anything to utilize a 12 volt one-wire level.  Hope I am being clear and thanks for your assistance.

Topic by appliancer   |  last reply

Arduino UNO R3

I want to make projects on Arduino UNO R3 . In fact i made one that is 3x3x3 LED Cube. But facing some problem.  I don't want to use Arduino all time. Please any one tell me the alternative for this. I want to do like this picture but i don't know the connections for this. PLEASE HELP ME

Topic by Tech Works   |  last reply

veritcal lines on a vizio tv m55osl

What can i do to fix the vertical lines on my vizio tv m55osl they are always visible they don't move or anything the only thing about it is when you are in front of the tv there not so bad but if you move to either side the lines get more apparent is there in easy fix or witch bored do i need to replace?also to watch cable tv i have to use a/v inputs because the cable input dosent work

Topic by JasonD16   |  last reply

Help me create a salvage/component list

Don't get me wrong I love going to RadioShack to purchase things I need for my projects, but I usually prefer to scrap older or broken electronics for my components. If you've ever scrapped to find a specific component, most likely it takes you a few very frustrating times if that. That's why I am going to create a list to post online or create a webpage for it, you can steal my idea if you wanna create it. It's going to be a list that will be alphanumerically listing: component type/ component part number/ a short explanation/s of what its used in/for, and then electronics that you can find them in. Ex: IC 16-pins         Uln2009           *motor driver         Found in: *manufacturer name* scanner model: #### So if you know any electronics that contain components commonly looked for please post the details here so I can frequently update it for everyone. 

Topic by Ryan53090   |  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

[HEADPHONES] Y-Part Cable Fix

Hi guys! I've read quite a lot of threads on this, but could not find anything related to my problem. I need some help with fixing my headphones. I've managed to break them exactly on the Y part where Left and Right headphones connect to the main cable. I want to solder them however not sure how to connect separate cables... I have a small schema here: Please note the Copper(orange) and the Blue(Blue) are together: blue is in plastic? coating with wrapped copper around but its two separate wires. Also, the magenta/violet on the diagram represents a white wire, All of the other cables except blue were coated in enamel?. The headphones have a built-in microphone with a button and its sony mdrzx610 model. I really hope there's someone to help me out I need my sounds back!

Topic by KevinasB   |  last reply

Vote for Raspberry Pi!

Http:// Pi 2 is nominated as both Best Developer Tool and Best Product, and Eben Upton has been nominated in the Tech Champion category. Vote for the Pi and Eben to win!;=105891 Also VOTE here by commenting 'Pi2"

Topic by DELETED_bertwert   |  last reply

How to build a network cable certifier?

I have a fairly extensive lan in my home that is constantly expanding. I want to do some custom wiring and started looking into building my own cat 6 cables. When I started shopping for the wire I noticed a lot of complaints about wiring not being capable of carrying gigabit speeds, CCA being sold as solid copper etc. Now I'm questioning the wiring I already have, wondering if it might be the culprit for random problems. I want to find a way to test my current wiring and anything I make in the future. But as anyone with experience knows a cable certifier is thousands of dollars. Then I got to thinking if i have two computers capable of gigabit speeds shouldn't I be able to run a cable between them and verify the performance of the cable? I was hoping someone here will have the experience I lack to make this a reality. Also if it was possible to make a smaller arduino based tool that would be amazing. This seems like a tool damn near everyone could use these days.

Topic by lerch419   |  last reply

Ethernet Wiring Order

Hi, I have a cat6 ethernet cable with 8 non-twisted wires all apparently being of different solid colors. Is it OK to attach both ends to the connectors in any order as long as both ends have the same color order? Since the colors are non-standard I can't go by any convention such as T-568A or T-568B. I am using this in my home and since it will be a one-off I don't care about convention standards as long as the configuration I use will work. By the way, do I need to be concerned about the fact that they are non-twisted wires? What's the difference anyway? I would appreciate your answer. Thanks.

Topic by oclaman   |  last reply

What to do with a Vialta Beamer video phone?

So years ago before broadband internet, Skype, and video conferencing for free, there was a thing called a Beamer video phone which used your landline telephone line to do video conferencing between 2 people. So my mom bought 2 of them, mailed me one, and we tried to do video conferencing between PA and FL, and needless to say, it was terrible.  Video was choppy, etc, everything you would expect for video trying to go over a landline phone circuit.  I would sell it on eBay, but it doesn't look like anyone is buying it, so rather than have it take up any more shelf space, I'm trying to figure out what else I can do with it.  I haven't taken it apart yet, but it looks like a 3" LCD screen with a little web camera on it and a microphone, and some kind of circuit board.  The housing is actually very pretty (see picture) with it's glass outside. So what can I do with this thing?  Can I build some type of open source wi-fi video conference station using skype?  Or some type of in-home intercom system with video? The possibilities are seemingly endless, any suggestions are welcomed!!

Topic by ericb1   |  last reply

good ideas for a van de graff generator belt

I'm making a van de Graff generator and i was wondering what would be some good things to use for the belt could a bicycle inertube work or would that be to conductive i read some were that usually black things have a slightly conductive coloring or something one more thing i was looking at the triboelectric series and was wondering what end the belt should be on aswell as the top and bottom roller

Topic by Tanners   |  last reply

Weird junk characters in Firefox?

So, I have this annoying problem with Firefox... As I browse the web, opening and closing tabs, I get an accumulation of (Japanese?) characters all over the tabs at the top of the screen.  It starts with one or two, but soon builds up to obscure the tabs, so that I can't find the Xs to close tabs, or even switch between them (see the screenshot). The characters occur no matter what websites I do or do not visit. It eventually gets to the point where I have to close the software to get rid of the mess. The problem has persisted through uninstall/reinstall of the browser, and the only add-ons I have running are a dictionary and McAfee site advisor. Yes, I know I could just switch to Chrome, but FF is my favourite browser. Anybody know a cure?

Topic by Kiteman   |  last reply

IoT server / gateway

Hello Instructables, Like a lot of people lately I'm experimenting with IoT and Home Automation. There are a lot of interesting projects going on, also a lot here at Instructables. But a thing that i run against is the fact of IoT Gateway/server software. On Google I found differed IoT gateways/servers that I wanted to share with you guys. If you have to contribute to my list, please do. All software's have there pros and cons, so more project the better.  - Thingspeak. This is a in the cloud site to witch you can send your sensor data and switch things - Exosite. Pretty similar to Thingspeak - IFTTT. This also a cloud site, with witch you can have your sensor data communicate with other services on the web like google, facebook, twitter - Openhab. Is a open home automation software that runs on the Raspberry Pi, it also has a android app. Unfortunately not that easy to configure. - EasyIoT. Is a pretty new server application, that looks great on the web and phone browser. Still new and in development.  Like I said all projects are have there pros and there cons. If somebody has to contribute to this list, please do. 

Topic by mfaber1   |  last reply

Newbie needing help please

Hi everyone, I'm new here, and new to making circuits. I've been scrapping them for quite some time and feel terrible about how much goodies I've thrown out in the process :(  anywho, I saved a ton of it, And today I picked up a "Futura 100 color graphics at its finest" box, it has 5 knobs on the front for: Hue, saturation, contrast, black, and white, has a power on led and reset button, floppy drive. in the back it has a 3-25pin connectors (2female and 1male) for printers, a video in and video out, power switch and 3 prong plug, fan, keyboard connector, and a 9-pin male test port?  Inside it had a dark drive and has TONS of ic chips. ill quit blabbering and get on with it, does anyone have any ideas on what this can be turned into? One or multiple projects is fine, as long as this thing gets a good use. I'm hoping to make a variables power with led display for my atx.

Topic by Ryan53090   |  last reply

12v to 120v sine inverter boosting

I have a 20 year old van. The a/c leaked and it is much cheaper to buy a 120v window unit ($140 with a 3-year walk-in exchange warranty) than to pay a shop to rebuilt the vehicle a/c. I chose a 5k BTU window unit that uses 4.1 amps running, and have a 1k watt sine wave inverter. Alone, the inverter will not start the a/c unit, but will power the fan. I confirmed a trick to start motors with an inverter. I connected an 8" bench grinder to the inverter and started it. It took a few restarts to get it up to speed. Then I started the a/c and it ran without problems. The bench grinder motor was able to supply the reactive power the a/c compressor needed to start. Both continued to run without straining the van's alternator. BUT, I don't want to travel with a running bench grinder going, that's not safe. Is there another way to supply the reactive boost that is safe to travel with? Once I get a simple stable way to run the a/c I'll work on a mount to vent the hot side. The van has sliding windows.

Topic by DavidN71