DIY My Own Music Docking Station(AUX IN)

Materials Needed

Thin Plywood
Hack Saw
Mica sheet for the plywood
2 * Small Speakers ( I got mine from Old Sony W810i Mobile Walkman  Speakers)
2 * Amplifier circuit (You can make one too)
AUX IN cable with MALE PIN.
Wood Adhesive/ General Adhesive (fevicol)

Cut the Plywood.

 Join it with Nails and Fevicol.

 Mica Sheet.

Adding the under hood things (circuit boards).

 Finished Product.

DIY Refilling a dead Ink Jet Printer Cartridge

Material Needed

Refilling Ink Black + Color

Medical Syringes with Needle.

Blade.

Electric Insulation Tape/ Any adhesive tape.

PCB driller + 1mm drill bit.

 Remove the Label on the Cartridge. This is a color Cartridge.

 It has three tanks.

 Keep Drilling near the air hole. Once the hole is drilled, you can pull out the drill bit. Now note down the color of the drill bit. Residue ink inside the cartridge will stick to the drill bit. You need to fill the corresponding color to each tank.

 Inject the correct color. Once you are done injecting all the color inks, you need to cover the hole with the adhesive tape.

 Calibrate the Cartridge inside the Printer and go with a test run.

DIY Fish Tank Decorator a Tunnel and a Cave

Happen to build a Cave and a Tunnel for my Fish Tank. Our fish love it.... Here is how u do it.

DIY Cave

Materials Needed

color stones
an empty coconut shell
strip of iron wire
white cement
river sand

 Create a basic frame on the coconut with the iron wire.

 Marking the cave entrance.

 Cut along the line with a HACK SAW.

 Embedded some stones between the metal frame and coconut. This space enable cement flowing smooth over the mold.

 Add water to white cement and stir.

Start with the masonry work over the mold.

 Baking under sun light to fasten the setting process.

DIY Tunnel

Materials Needed

white cement
river sand
broken floor tile
PVC pipe 120mm diameter
iron wire

 Make a iron mesh with the wire.

 Roll it over the tunnel pipe. Make sure to embed some stones in between.

 Mix white cement + water + river sand. Start the masonry work.

 Finally.

 Generally it takes 12 hours to dry. Make sure to water the mold the next day. More the time you wait for it to dry better the strength of the structure.

All the Hard Work fly away, when you see the fish are loving it. On the Fish Tank...!!!

Safe Delete(Shred) DATA in HDD/ Partition in LINUX

What Happens when you issue remove command on File System?

     Most File System just remove the vnode link from the DIR structure. So what happens to your DATA. You got is right, it just sits at the DISK, waiting for be overwritten or to be recovered by a Crash Recovery Software. The latter sounds good when you are actually using it, but if some one else uses it. You know the consequences. 

How to Safe Delete/ Shred File?

Simple, use any of the above commands

sudo dd if=/dev/zero of=<Device Target>

eg 

sudo dd if=/dev/zero of=/dev/sda

To get the Device Target use the following command

fdisk -l

This command lists all the Disk Partition info with Disk targets.

You can also use this command, if you need to be so sure. This makes two passes in shredding. 

sudo shred -vfz -n 1 <Device Target>

eg

sudo shred -vfz -n 1 /dev/sda

You can also use the LiveBoot of gparted.iso(http://gparted.org/). Boot it via CD/USB. And issue the above command even in Windows/ NON-Linux x86 Machines.

Note : Be careful when playing with these commands. You may purge away useful data Partition/Disk.

Our Terrace Garden

After much hard work and finally had my first harvest today..

Flowering Plants

Rose

Tomato

 Beans

 Palak

 Palak and Spinach

POC : Germination on PVC PIPE (Terrace Garden)

Here are the pics. Plants gown here are as follows.
1. Siru Keerai(Tamil) aka Tropical Amaranthus(Botanical)
2. Arai Keerai(Tamil) aka Amaranthus dubius(Botanical)

Added coco peat to get healthier seed germination.

More info to make the PVC structure @
http://ddeepakraja.blogspot.in/2013/05/diy-terrace-garden-from-pvc-pipe.html

DIY: Make PCB circuit board at HOME (TONER TRANSFER METHOD)

Bill of Materials

• Ferrous Chloride (PCB Etching solution)
• PCB Board
• Express PCB on PC.  http://www.expresspcb.com/. 
• Laser Printer or ( INKJET Printer and Photocopier which uses LASER printers ink)
• Ordinary Paper
• Permanent Marker PEN
• Hot Iron box
• Kitchen Dish wash bar (VIM dish cleaning bar)
• Scrub Pad
• Tissue Paper
• Paint Thinner Solution
• 0.1''(inch) drill bit and 0.08"(inch) drill bit
• Hand Held Driller/ Motorized Driller.

Caution : You are gonna play with Industry Grade Corrosive Solutions. Wear Eye Glasses and protecting gloves before working on this.

1. DESIGN OF PCB CIRCUIT

You need Express PCB software at http://www.expresspcb.com/. 

PCB components
Pad - The portion of the conductive pattern on printed circuits designated for the mounting or attachment of components. Also called land.
Traces - Literal wire for connecting pads and nodes.
A width of 0.010" is a good default for digital and analog signals.  For power lines, use traces 0.05" or wider.

LAYERS of PCB board

Red -- Top copper layer selection

Green -- Bottom copper layer selection
Yellow - Top silk layer

Start designing the circuit and finalize the design.

2. PRINT OUT the circuit (Toner Transfer Method)
Issue a print out on the Laser Printer. Make sure to make darkened printout. This can be done by changing the printer darken properties. If you happen to have Inkjet printer make sure to print the circuit and obtain a photocopy on photocopier with LASER printer INK. Make sure to darken the copy Image too.

Note: You may/may not need to mirror the circuit image before printing out the circuit on the paper. This step may be need as per your design of the circuit. 

Note: Laser Printer Uses TONER INK. Any printing device using TONER INK is sufficient.

My Printout of the circuit. If you have multi layered  PCB(usually 2 layered). Make sure to take one printout for each layer. I went with single layered PCB only.

3. PCB Cleaning
Wash the PCB Kitchen Dish wash bar (VIM dish cleaning bar or any alternate). Make sure to use the scrubber pad and remove all the oily residue attached on the top of the PCB. Wash with water. Wipe it with dry Tissue. Don't ever touch the Copper side. Your touch places oil back on the PCB.

4. IRON Out the Circuit to the PCB
Make sure to place the circuit print on the copper side and fold out the rest of the paper around the PCB. Use of Sticking tape is not encouraged, as Tape tends to melt out when heat is applied. Apply the Hot IRON on the Paper. Make sure to apply heat uniformly across all the sections of the circuit. Keep the heat and press on the paper for minimum of 10 minutes.

Caution : You are playing with HOT IRON. You may get burns if not used properly. Entire PCB board with the Paper on top will be so hot to hold.

5. CIRCUIT on PCB
After hot iron, give some time to cool out. You will now notice that the CIRCUIT INK melted and stuck to the PCB board. Immerse, the PCB into water and start peeling of the paper. You get the Circuit on the PCB.

6. CORRECTION on PCB circuitry (if any)
You can use the Permanent Board marker to sketch up the left over circuit traces.

7. FERROUS CHLORIDE (the Magic Solution)
Make sure to read the instructions on the solution pack. Usually this chemical comes as a power form. You need to make sure to follow the instructions given in the pack to make the liquid form(Mix with water). Ferrous chloride eats away any exposed metals which comes in contact. Even its vapor is corrosive. Tie the PCB to a Plastic wire and lower it into Ferrous Chloride, which is contained inside a Plastic box. Ferrous Cloride can't attack Plastic. Never touch the solution on bare hands. If happened to touch it accidentally, wash it thoroughly on soap and running water.

Caution : You are gonna play with Industry Grade Corrosive Solutions. Wear Eye Glasses and protecting gloves before working on this.

Make sure to shake the container often, so that the solution is spread out evenly. Generally, it takes less than 20 minutes to etch the metal fully. You have to take out the PCB with the tied wire to check this.

8. PCB Cleaning
Once all the exposed metal are etched away. Dip the PCB in water. Use Kitchen disk wash bar and Scrubber pad to clean the TONER INK. You can also try Thinner solution on the PCB to remove TONNER INK.


10 . FINAL PRODUCT

Note : You have to use the Driller to punch hole for the components mount pads.