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  1. Replies
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    USB charger is a useless thing for AAA ,will be a...

    USB charger is a useless thing for AAA ,will be a joke ..why to keep 20W PC (standby) running for 100ma current that too for 8-9hours
    ... USB chargers of ipods etc can be useful for places like...
  2. power units are not massive .. some steppers...

    power units are not massive .. some steppers need high peak currents .PSU sd be abe to deliver .. if the work is very small like a pen plotter .... tiny motors can do


    for projects like CNC...
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    Laptop ones are critical as the cells if u use...

    Laptop ones are critical as the cells if u use need to be charged via a controller . Temperature rise during charging may explode the cell.

    there are emergency mobile power packs , try for...
  4. Many places u get 12v smps .... at 100rs u can...

    Many places u get 12v smps .... at 100rs u can use , check the current ratings 12v 2A+ needed
    use one of the following :

    1)LM7805K it delivers 3Amps current use a heatsink if needed
    or
    ...
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    Solder difficult SMD ICs

    Refer the steps :
    http://i45.tinypic.com/67sgo7.jpg

    I added the tutorial here too

    http://www.instructables.com/id/Hand-solder-embedded-pin-smd-ics-like-qfn/

    Any problems questions there ...
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    http://www.hifivision.com/diy/1657-diy-iron-home-p...

    http://www.hifivision.com/diy/1657-diy-iron-home-pcb-fabrication.html all info there enjoy !
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    Quickly made diagrams as how to do it type steps....

    Quickly made diagrams as how to do it type steps.

    Step 1:
    http://3.bp.blogspot.com/_h3GazsWgRaY/S2gOTEooxpI/AAAAAAAAAeI/QFxLaarcSeM/s1600-h/1.jpg
    Step 2:...
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    vikas Thank you , i did the build...

    vikas

    Thank you , i did the build quickly.... so dint search much .I used paper for :

    -paper can be removed if trial fails,that iron was reusable
    -cheap and fast

    Great info with...
  9. Replies
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    5,686

    Homebrew hot air gun in 300 /-Rs

    What is it

    It is a soldering iron that provides hot air at 200 -300deg temperatures .Used in surface mount soldering see pic of a surface mount IC...
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    U can use Lithium ,better take the ones like...

    U can use Lithium ,better take the ones like 18650 sized (mainly used in laptops). Better use 3 pieces
    If needed increase the voltage use a cool circuit like this...
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    http://www.4freeimagehost.com/push.php?si=www.shri...

    http://www.4freeimagehost.com/push.php?si=www.shrinkpictures.com/processed/&fi=phpgB8ed3AM.jpg

    Small IC on Thumb.
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    Dont shake by the details , i want all to know...

    Dont shake by the details , i want all to know that any enthusiast can learn that platform. Phase 2 of the build is updated :

    ...
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    So called glorified project sites taking...

    So called glorified project sites taking advantages of indian market. Here in local market they sell 1000 only not 1 -2 pcs . I get my stuff ordered via a broker ..who works for companies .
    My...
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    Here is a simple circuit ...

    Here is a simple circuit

    http://www.uncommonprojects.com/uplog/2008/10/22/solar-charging-a-nokia-n95/

    change the R1 and R2 to make the output 12V use the calculator : ...
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    Make PCBs At Home without Ferric Chloride

    Hi guys ,

    Many people do PCB work for the projects , but getting FeCl3 is an issue .. it is not environmentally safe and
    gets damaged easily ..


    How about a clean way to make PCB...
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    snk_naveen, why to roam all over for it ? ...

    snk_naveen,

    why to roam all over for it ?
    buy Hydrozen peroxide from pharmacy (u will get in many places) 60/-
    and use a harpic (toilet cleaner) + 45/-

    Hand drill 50/- u have...
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    fT232 is 20/- Rs in bangalore vishal electronics....

    fT232 is 20/- Rs in bangalore vishal electronics. retail prices are much less than the online prices .
    That is a thruhole part ,smd will be hardly 50Rs. :)
    try the one i gave , dun be negative...
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    My story : I bought a china made LED torch...

    My story :
    I bought a china made LED torch cum table lamp. Costed 110Rs :)
    Charges well gives 8Hour backup minimum(did not check when it goes off) from a 6hour charge

    What is special...
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    Lets build with led lights

    Hi all,

    there is a growing interest on the LED projects among DIY people all over the world.
    LEDs are simple and are replacing the common lights very fast.

    What can I make ?
    ...
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    OK , but why ? If u have a serial i/f ...

    OK , but why ? If u have a serial i/f programmer (just the converter sd work, as told in the site below )

    however if one wants to build one i can help...
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    USB to serial is just 150/-

    USB to serial is just 150/-
  22. Replies
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    Vendors exploit the indian customers as arm...

    Vendors exploit the indian customers as arm boards are less here , the price LPC2129 actually is about 600Rs , they are very entry level ARM and do well for lightweight projects .
    Better get a SBC...
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    i also used to work with 89c51 during college. ...

    i also used to work with 89c51 during college. Good for small projects and products.

    You should plan to learn the ARM chips , that will give real good knowledge for doing serious
    hitech ...
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    Thank you avinash , see the bare board:...

    Thank you avinash ,
    see the bare board: http://img412.imageshack.us/img412/5817/arm9boardpcbrev202.jpg .I hope a low cost board will be of great help for learners .

    I plan to give 1 day...
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    LCD module is a easy to program unit , it has ...

    LCD module is a easy to program unit , it has all the display inbuilt and done by the chip on the module .

    Arduino boards are easy to program (it is a particular board with Atmegachip...
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