Search for anodizing in Topics

process for anodizing aluminum with limited equipment?

Recently I have learned the basics of anodizing aluminum, and from what I understand the basic process is to clean of the aluminum bit to be anodized, stick it in a bath of a dilute solution of sulfuric acid, and do some electrolysis with the anodizing bit connected to the anode or positive of a supply, then pulling it out some time later and cleaning it off with soapy water and rinsing, and coloring the metal in a thin runny die, then wiping off excess and boiling the part. So first of all, do I need sulfuric acid? Any substitutes? Will HCL work, or a weak acid like vinegar or even salty water?  If the purpose of the sulfuric acid is to allow free ions to flow in the water, I do not see why it would not work. However, I am not a chemist, and my experimentation with electrolysis is limited to 6th grade science and dropping 9V batteries in salty water. (My favorite experiment was at home when using copper  and coins as the electrodes and watching blue-green corrosion develop and sink until the copper wire was made brittle and thin. Caused some AA rechargeable batteries to explode in the process though lol!) Also, will any die work? For really small parts, will it be possible to evenly die them with sharpie, standard paper markers, and/or highlighters? What dies will work well? Should the dies be water based, or based on some other thinner?

Question by -max-    |  last reply

Colors on tungsten by anodization? Answered

I want to make tungsten rods in colors. As it is possible to have titanium in MANY colors by simple variation of the thickness of oxide-layer, i wonder if the same is possible with tungsten. Somebody tried it already? What are the voltage-ranges for nice colors?As references:

Question by Orngrimm    |  last reply

Re-anodizing a macbook pro? Answered

I am getting an old macbook pro in the mail soon and am going to have to pretty much tear it down completely to repair it. I have seen a few guides on anodizing aluminum, and was wondering if maybe, possibly I would be able to anodize my macbook to a different color! Would this require de-anodizing the aluminum? (the model is a late 08 macbook, so I dont know if that is a powder coated one).  It would be awesome If I could color it a nice matte black (my preferred color) Has anyone attempted doing something like this before? I have some scrap brushed aluminum to practice on.. would that work? I know this could be easily accomplished with a black case... but I kind of want to go a bit further than that... 

Question by astroboy907    |  last reply

Anode and cathode metals? (For electrolysis)

I want to seperate some water to get Hydrogen to play with, so I made a little electrolysis device with a 12v power supply. The only problem is that I have no idea what to use as the anode and cathode! Could I just use screws? Or pennies or something?

Topic by Login258    |  last reply

How should i clean painted brushed steel?

I'm currently working on the restoring of a Philips 748 from 1979 and i want to clean its  frontal plate, which is brushed steel with what looks like electro painting. What can i use that wont ruin the paintjob?

Question by vinacarv    |  last reply

Anodizing cooper tubing, can it be done?

Is it possible to to color pain houper tube by anodizing?

Question by vallka    |  last reply

pipe suppliers for color anodized finish?

Anyone have a go-to site for listings of pipe/tube suppliers that offer the product with anodized color finishes? My searches aren't yielding much. TiA...

Topic by valrith    |  last reply

how do i anodize aluminum?

Thinking of anodizing some aluminum parts im making. Does it matter what kind of aluminum? I want a durable finish, resistant to corroding.

Question by klunder_teach    |  last reply

Hydrogen Fuel Cell Porous anode and cathode?

I found this image that details a hydrogen fuel cell (reverse electrolysis). Does anyone know what materials are good for the porous anode and cathode? Is carbon porous on a molecular scale? I want to make a simple reverse electrolysis in order to use hydrogen power. I would appreciate any help. I got the image from here:

Question by mykiscool    |  last reply

Arduino Current Sourcing for Common Anode RGB

Question: Is it safe for the arduino to sink more current then the arduino is sourcing? (see diagram below) My project requires 12 of large 10mm RGB leds,  broken down this is 36 leds in total, which exceeds maximum draw,  the design calls for the LED's to share a 5v+ from a seperate 5v regulator, then sink each pin to low to turn them on is this correct?

Question by rdlockrey    |  last reply

3w common anode RGB LED circuit?

Hi all,Does anyone have a link to a circuit diagram for a common anode led? Here are the specs:Red: 2.5V ~ 3.0V, 350mAGreen: 3.2V ~ 3.8V, 350mABlue: 3.2V ~ 3.8V, 350mAI picked one up and didn't realize the effects of common anode v. common cathode :/ I can run it with drivers from one of the instructables floating around, but I have to use totally isolated power supplies (i.e. one separate battery for each color). I realize that I could use PWM for them, but I don't have the tools to program and burn a chip right now.Soooo, either a circuit that can sink current (I believe that is the correct terminology) or some way to isolate power between the 3 colors would be much appreciated.Here is a link to the led I have:

Topic by homba    |  last reply

Resistor values for common anode RGB LED? Answered

Hi,  I have 10w RGB common anode LEDs. Forward Voltage is R:6-8v, G:9-12v, B:9-11v. Forward current is 300ma.  I calculate resistor values as R:15ohms, G:1Ohm, B:3.9Ohms.  This is based on max Forward Voltage.  I was told I wouldn't need resistors but clearly that is not the case as in one of the LEDs the red has failed.  Is it as simple as putting the correct value resitor between each cathode and supply?  Also, if I were to increase the resisors to lower the voltage a little (i.e. R:7v=18Ohm,  G:11v=3.9Ohm B:10v=6.8Ohm) would that help keep the heat down? Many thanks,

Question by Summerly    |  last reply

i need help connecting led cube anodes to pic16f690?

What led base anodes do you con nect to the pic and which pins

Question by zane20062  

common anode and common cathode differences in 7segment display

What are the changes need to do when using common anode seven segment display instead of common cathode seven segment display. hint:use transistors?

Question by nethmi.amanda.3344    |  last reply

How do I use a Common Anode 7-Segment LED? Answered

I have a SA23-12EWA Common Anode 7-Segment LED and I can only get the decimal point to light up. How do I connect it so that the other segments light up?

Question by powerman666    |  last reply

In a vacuum tube, are the anode and the cathode connected in any way? Answered

In the wikipedia article, they refer to the cathode as a filament, which I thought was a bit odd. The only other filament I'm familiar with is in a light bulb. I was reading a book about vacuum tubes earlier, when I looked them up in wikipedia searching for a diagram: vacuum tube. Basically, a vacuum tube is a capacitor with a vacuum as the dielectric? Does a vacuum tube retain a charge? They seem to have the same principle: anode, cathode, dielectric. In a way, a battery seems to also be similar; the difference being the galvanic process involved. I attached a picture of a Daniel's cell from back in the day.

Question by Vorenus    |  last reply

Would this battery work?

I want to make a compact battery, I need it to generate as many volts possible. The battery materials are the following: Anode: Zinc Cathode: Steel Electrolyte: Sulfuric Acid Is that the optimal anode and cathode I can use to get most volts out of it?

Question by Nitr0    |  last reply

Most people have a hot water heater in the house. Anyone know how to change a John Woods heater's Anode rod?

Its a plumbing problem possibly requiring cutting copper pipe and soldering fittings together. Basically I need to know if the anode rod is in the same place as usual for most hot water heaters or if my John Woods hot water tank does have the anode connected to the hot water intake. If so, how am I going to save money and change the magnesium anode rod myself rather than paying a plumber 80$/hour.

Question by rgrewal    |  last reply

How can you tell what is the anode and cathode on a tri-color LED--it has 4 leads? Answered

Its this LED here also what is the best way to hook it up

Question by Fresnel110    |  last reply

Sanding Laser Etchings and Saltwater Etching Through Anodization ?s

I own an iPod Shuffle, 2nd generation, silver. It is very plain, and I've recently been reading up on saltwater etching. I want to remove the standard Apple logo from the back and etch my own text (it will either be "iMake" or "iBles", I can't decide). I've come upon two roadblocks, so far, those being: can I sand laser etchings (the Apple Logo) off, and can I etch through the player's anodization, or would I need to sand that off? I don't really care if it doesn't turn out perfect, or looks like a total mess. It's not like I paid for the thing. Thanks for any help!

Topic by Bran    |  last reply

I have a question about electrolysis...

Why doesn't it work when I put the anode and the cathode in two different container when I am separating hydrogen and oxygen from water in electrolysis...?!

Question by nicki0850    |  last reply

i want to control 5 common anode RGB led's with my arduino, i want them to fade throgh the color spectrum amy thoughts?

I have 5 common anode RGB led's, which i am building into a lamp setup for a present. as well as controlling them with my arduino, I would like the ability to manually adjust the color, my budget is 50 dollars, and i have 2 weeks to complete this project. i would really appreciate the help.

Question by jamesr370    |  last reply

Removing rust from the inside of a motorcycle gas tank using the electrolysis method? Answered

Which is better for removing rust from the inside of a motorcycle gas tank using the electrolysis method? Steel anode or carbon graphite anode? I have tried both. I like the carbon graphite better. It seems to be a cleaner process and to work just as good as the steel anode. Should I use 12 volts or 3 volts? Does a pulsating DC work better than a continuous DC? What is the best amperage?

Question by Goldwingracer    |  last reply

Using Common Cathode Instead of Common Anode rgb led with IC?

So I'm trying to do this: and I realized that I have the wrong kind of led..the author says you have to "adjust the connections" but I don't really know how. Right now my led will glow but not change colors. Does anyone have experience with this?

Question by njaber    |  last reply

9 pin, 1/4" input/output. Which pins are the anode and cathode? [PIC]

I have an 9(?) pin 1/4 input/output. I got it off an old radio. Which of these 9 pins would be the anode and cathode? Looking at the pins, starting from the top there are 3 rows. the first row has 1 pin labeled (1). The second row, 4 pins labeled from left to right (8, 7, 4, 5), last row, 4 pins (9, 3, 2, 6) Any help would be amazing, as I am trying to ghetto rig a distortion pedal.

Question by surlistyc    |  last reply

Can I fit a 10W heatsink in a zippo? Answered

I want to put a cree XM-L LED in an old zippo, and I want to know if anyone knows how to fit a big heatsink in the top part of a zippo lighter, not in the base, and preferably able to buy everything from a hardware store, not ordered online.  Also, does anyone know how to anodize aluminum for added heat dissipation?

Question by jduffy54    |  last reply

What metal doesn't react with sodium? Answered

I am trying to make sodium. I used graphite and copper wire at the anodes and cathodes. Both of them combine with the sodium and corode. That leaves me with 0% sodium.

Question by chinarian    |  last reply

Air Instructables pilot's license - Toss It! Prize

We did the design for the Toss It! prize today. Here's how it looks. These are laser-etched anodized aluminum cards. You can only get one by winning the contest.

Topic by fungus amungus    |  last reply

RGB Led doesn't mix colors

Hey all I am working with common anode RGB LED. I hooked each leg (red, green, blue) to pins 2-4 of my Arduino UNO. I then hooked the anode to 5v via a 22 ohm resistor. The code I wrote was very simple; turn pins 2 through 4 low, delay 500, turn pins 2-4 high. The problem I found was that instead of the color turning white it stayed red. I tried mixing red with green and red with blue, each time same thing it stayed red. Does this sound right?

Topic by Mpc1055    |  last reply

How can I create a manually controlled rgb led controller?

I have a 4 lead common cathode led.  Would it be as simple as building an led driver circuit and placing a potentiometer between supply and each anode?

Question by chandlerman    |  last reply

What practical applications do PNP and NPN transistors have? Answered

I read about NPN and PNP transistors and I was wondering what type of applications are right for each type of transistors. I understand that depending on the type of transistor the emitter should be connected to either an anode or cathode.

Question by blkhawk    |  last reply

RGB-LED with 6 legs? Answered

As far as I know, RGB-LEDs have 4 legs: 1 common cathode and 3 seperate anodes (or vice versa). Santa Claus has left me a RGB LED with 6 pins. Now I'm confused and he has left the country! Can anyone help and explain this to me?

Question by bertus52x11    |  last reply

stop 7-segment from ghosting?

I'm working on a simple arduino 7 segment driving circuit. (It also has a led bar-graph that displays binary numbers but that part is working fine.) When I get the display working I might make an instructible out of it. Here's the basic layout: -using this 8 segmet 4 digit common cathode display. -arduino controls what segments are on via 74HC164 8-bit Serial Shift Register -shift register controls an array of 8 PNP transistors with base and pull-up resistors -transistors connect to display anodes through resistor array -display cathodes (common for each digit) connected to array of 4 PNP transistors with base and pull-down resistors  -PNP transistors controlled by arduino. (I will post the schematic shortly.) In software, to display a four digit number, I shift the pattern for a given digit to the shift-register, which in turn turns on the PNPs for the corresponding segment anodes. I then turn on the NPN for that digit's cathode. I delay for a few milliseconds, then turn the NPN off, shift the next digit in, and turn the NPN for that digit on. Rinse and repeat. It works fine but the segments that should be off are at about 1/2 brightness, making all the digits look like eights. Even the DP looks like it's on and I'm not turning it on anywhere. Do I need pull-down resistors for the anodes or something? What's going on here?

Question by Vick Jr    |  last reply

What are the specs for 'standard' 3.5mm mono pluged infrared (IR) emitters?

An example of what I'm talking about can be found on Amazon.  I am looking for which conductor is anode and which cathode as well as the forward voltage and current requirements.  My inability to see IR is really hurting my normal LED testing techniques.

Question by EmperorMing    |  last reply

How can I color aluminum wire without annodizing?

I bought a spool of 14 gauge aluminum wire for chain maille. My goal is to have alternating black and natural colored rings used for the maille. In a household metal working book I found from the 80's, they said to,"Mix 2 tablespoons lye into 1 quart cold water. Add aluminum part for 1-2 minutes. Submerse part into household dye mixed according to manufacturers directions until desired depth of color is achieved. Rinse in cold water".I tried this method using RIT black household dye; however, it was not successful. I am trying to dye the wire both RED and BLACK. If no method for the red is found, I can purchase a short length of anodized red wire; however, If there are any chemical reactions for turning the wire black, that would be great. Thanks!!

Question by kreationism    |  last reply

Two questions regarding electrolysis. Answered

Okay; two questions regarding electrolysis. What should i use as an electrolyte? When I used salt, I got Hydrogen and Chlorine, and I want Hydrogen and Oxygen. Next, What should I use for my anode and cathode? I've heard of carbon rods and titanium rods, but i don't know where to get them from.?

Question by Ryan Cooper    |  last reply

Animatied 3x3x3 LED Cube !

A guy named "portreathbeach" built this simple 3x3x3 LED matrix. It uses a PIC16F690 in a ZIF socket for the brains. Each layer has nine LEDs with the cathodes tied together. The anodes from each LED are connected to the LED below. The LEDs are multiplexed so that even though all layers appear to be on, they're being addressed individually. Video of the matrix in motion below !!

Topic by =SMART=    |  last reply

how would i wire my 5x7 led matrix to work with 74hc595 and arduino? Answered

i have a really neat 5x7 led matrix from a recycled led sign from a surplus store and the rows are anodes and the columns are cathodes. i would like to get it working so that i can display messages on it.

Question by devicemodder    |  last reply

hot water side smells all of a sudden -

On a well with a Hydrogen Peroxide and water softener system.  Warm water side smells sulfury or nasty all of a sudden.  Plenty of salt in softener and plenty of Hydrogen Peroxide being pumped into system.  Due to softener, the watre heaters never had their anode rods installed - so not coming from there.   What is causing the recent smella nd how to remove? 

Question by bebolf    |  last reply

Make Led cube? Answered

Hi, I want to make a 4x4x4 led cube ? Please tell me which is the best instructables to make a cube? Which cube is good common anode or cathode? I want to make the cube with a arduino uno I find  a  instructables - Is it good to make and is it need any transistor?

Question by Soumojit    |  last reply

where does electricity go?

I got a question. If we ground everything to the Earth for shorts and things like that, Where does that electricity go to? Does it just disappear deep down inside the earth? Does GE have an electrical well and is sucking all this electricity that people pour onto the ground? Please dont use big words like anode and cathode and coulombs (simple is better) :)

Topic by thematthatter    |  last reply

Removing Broken M2 Tap from Anodised Aluminium 2014.

Hello Everyone,As you might have read, I have a Milled Aluminium 2014 Block which is Anodized with Black color, Today when I was tapping the holes of it, the M2 Tap broke and got stuck inside that hole, there is no portion of it outside the hole, so I can't unscrew it and pull it out.I saw a few videos on youtube on how to use alum water, or electrolysis(with 10% dil H2SO4) to dissolve or chemically remove the Tap bit from the hole, But my question is is it possible that using any of the above options could destroy the anodizing on the job work. and is there any other easy method I can use?Please Note that the tap bit is M2 and There are no tap extraction tools for a bit that small on the internet (or Locally Available in India) but if you find one Please post links for the same. Please Be Positive and make this community a happy place. Thanks.

Topic by _Boltz_    |  last reply

Using a 74141/7441 or KM115

I'm having much difficulty understanding 74141/KD115 chips. Do I supply the Vcc and GND pins with the 140 volts I'm using to drive the nixies? I'm guessing that each output of the 74141 would go to each of the nixies anodes, but do not know this for sure. A quick tutorial or explanation would be much appreciated. Thanks, -B.

Topic by B_A_M    |  last reply

Rgb matrix, looking for some advice/guidance.?

Hi, its been quite some time since Ive been here. And I still have the same two projects in mind. However, the project im more focused on, is a 32x16 RGB led matrix. Made up of four sections. Im following the project by the two guys over at They arent very active and speak a different language so their english explanations arent as thorough as Im looking for so I figure id ask the people here :) So, the main questions I have: 1. What kind of material can I use to put the leds on? its like they use thick cardboard or wood. they drill all four holes per led so the legs go through. I want one big board instead of two.  2. What spacing would be good to make it look uniform, yet give enough space to solder?  3. How can I make the 4 controller boards to run it? - They sell them, but they arent cheap. And they dont deliver or sell to the US. So Ill have to make them somehow. I can provide images/part list of what they used.  4. What type of solder/soldering iron would I need? Obviously various temp. But what temps would be safe?  5. What power supply can I use? Ok so, any other info: -They used common anode LED's  -They connect the boards together via ethernet cable.  -They connect the led's together in four sections of 8x16, The anode is connected on each of the 8 rows. And the anodes on all the led's are connected on the 16 rows. If that doesnt make sense, the anodes are connected vertically, and all the cathodes are connected horizontally. -They connect the 48 cathode wires to ribbon cable, that goes to the controller board, same with the anode wires.   -They connect the boards to a Usb to UART connector -Lastly, Part list of one controller board:  HEXFET IRF7314 x4 TLC5940NT x 3 28 Pin IC-Socket 300mil x 4 Resistor SMD 0,25W 1% 10K x 10 Resistor SMD 0,25W 1% 2K2 x 8 Resistor SMD 0,25W 1% 2K x 3 Resistor SMD 0,25W 1% 220R x 2 Resisitor SMD 0,25W 1% 1K x 3 AtMega 328P x 1 74HC138 SMD x 1 Ceramic Capacitor 22pF, 20% x 2 Oscillator 16,0 MHz x 1 Pinheader 2x8 Pitch 2.54mm x 4 Jumper x 3 Pinheader 1x2 Pitch 2,54mm x 7 Modular Jack x 2 Ceramic Capacitor 100N, 20% x 5 Electrolytic Capacitor 680uF x 1 LED 5mm blue x 1 LED 5mm green x 1 Screw terminal 5.08mm x 1 If theres ANY more info required please ask. It said to be as detailed as possible.

Question by 'earl    |  last reply

how to connect 5MM RGB led to connect with 12v 6A controller?

Dear all,  i am bit confused and want your expert help for following matter. 1. I have 12v 6A (2A X3 each= 6A)  RGB contoller  : as this link;=item2588543cac  2. I have 5 mm common anode led: as this link;=item2348a8b539 i want to connect this 5mm common led total 6 nos with above mentioned 12v 6A RGB contoller.   how to connect it safely so that led will not burn . because red needs 2.2 v  , 20 ma , blue and green need 3.2v  , 20ma  to light up. and source is suppling 12v 2A . i think if i connect it directly . it will burn the led. 

Question by YOG PATEL8186    |  last reply

LED, bipolar diffused common-cathode ultra wha?!

I was browsing through one of my local supplier's LED catalogue..Literally overwhelmed by the types of LED out there.. Diffused, non-diffused, super flux, super bright, ultra bright, common anode, common cathode, flashing, bipolar, etc..Anyone care to enlight this electronics noob? Plus some of the LED spec says something like 630nm, 1800mcd, what do they mean? Thanks..

Topic by gyromild    |  last reply

Does Chromesteel disolve during copper-electrlysis with Coppersulfate?

Hi I want to refine some copper and change it to copper-dust-particles by means of copper-electrolsis in a bath of disolved coppersulfate. Since my copper is in smaller bits id like to have some sort of etallic basket to hold the scraps. I think i would like to go with a chromesteel-mesh i connect to the power. The mesh/basket contains my scrap-copper and the anode-sludge can pass thru the basket... The basket (anode) and the copper-cathode are connected to the powersupply. Now my question: I think the chromesteel shouldnt get disolved as long as i dont crank up the voltage too high or let it run without sacrificial copper at the cathode. If i would do that, it would start to split the water used in the solution and produce H and O. Bad. Also would slowly eat away the metals too. Bad^2 But as long as i have copper to be disolved at the cathode, it shouldnt do anything to my chrome-steel-basket, right? Thanks for inputs from someone who knows it better than i do :)

Topic by Orngrimm    |  last reply

Coding to controll a 4x4x4 led cube with arduino duemilanove... Help please?

Okay, i know how to build the cube and to multiplex it to use only 12 pins. what i am going to do is connect each anode of each level and connect each cathode of each row, and each one will go to its own transistor. so i will have a total of 8 transistors for the anodes and 8 transistors for the cathodes, which i can further multiplex into two groups of 4x2 transistors. that makes a total of 12 pins on the arduino(i hope that makes sense ill add pics of what i mean to help) but what im asking is that i need help on writing the code for this project. i have a basic idea to run loops inside of loops to make more than one led look like theyre on at the same time(i believe its called persistance of vision)  but maybe someone more experienced would be able to help me out with this. thank you to anyone helps and A Happy New Year To All Of You!!!

Question by the seaker    |  last reply