Electronic and Electrical Club

aruna1

Well-known member
  • Apr 22, 2008
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    270627_234901503210538_100000720709799_828103_6573375_n.jpg


    මචන් මේක උඹ හැදුවද?
    මේකේ එළිය ප්‍රමාණය කොහොමද?
     

    kudcp

    Member
    Mar 17, 2007
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    ඉලෙක්ට්‍රොනික් කියන්නේ ඇත්තටම මාර වින්දනයක් ලබන්න පුළුවන් විෂයක්. ඒ වගේම තමන් කරපු නිර්මාණයක් එක්ක ලබන සතුට මම හිතන විදියට වෙන මොනම ක්‍රමයකින්වත් ලබන්න බැ.:)

    100% ඇත්ත කතාවක්.. ;);)රෙප් කොල්ලො
     

    kudcp

    Member
    Mar 17, 2007
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    මමත් හොඩක් ආසයි. මේක මුල ඉදල නිදහසේ කියවන්න ඕන
    මමත් හිමින් සැරෙ තම පටන් ගත්තෙ... හදපු ඔක්කොම සාර්තක උනෙ නැ එත් එක දෙකක් විතර වැඩ කරම එන්නෙ පුඩුම සතුටක්.. ඔයත් සරල Circuit එකකින් පටන්ගන්නකො.. මෙ thread එකෙ ඉන්න හැමොම උදව් කරයි.. all the best..
     
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    wasangaama

    Well-known member
  • Feb 5, 2009
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    www.amaphoneshop.com
    ඉලෙක්ට්‍රොනික් කියන්නේ ඇත්තටම මාර වින්දනයක් ලබන්න පුළුවන් විෂයක්. ඒ වගේම තමන් කරපු නිර්මාණයක් එක්ක ලබන සතුට මම හිතන විදියට වෙන මොනම ක්‍රමයකින්වත් ලබන්න බැ.:)
    ඒ වගේම මචන් වෘත්තීයක් විදියට හරියට කරොත් ගොඩම තමයි.
     

    wasangaama

    Well-known member
  • Feb 5, 2009
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    මචන්ලා මට 2N3055 එක ට්‍රාන්සිස්ටරයක් යූස් කරලා 6V වලින් වැඩ කරන්න පුලුවන් ඈම්ප් එකක් තියෙනවනම් දෙන්නකෝ

    බස් එන්ජිමකින් දුවන ත්‍රීවීල් එකක් හොයල දියන් මම හදල දෙන්නම්
     

    I'ts My Style

    Well-known member
  • Nov 18, 2010
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    එලි පත්තේ
    ඒ වගේම මචන් වෘත්තීයක් විදියට හරියට කරොත් ගොඩම තමයි.

    සිරාවටම මචන් මම NVQ level 4 වෙනකම් කෙරුව. නමුත් රැකියාවට තොර ගත්තේ වෙන විෂයක්. තවමත් විනොදෙට කරනවා..
     

    sudu pusa

    Well-known member
  • Oct 12, 2010
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    මහනුවර නගරය
    FPC4BP9RD6EZR7BTBZ.MEDIUM.jpg



    A little while ago, Makezine blog listed two interesting sites: HOW TO - Make a rusty nail LED night light and ELM - AVR based radio spectrum monitor.

    Chan has a great site and he has put up a lot of interesting projects, incidentally many of them based on AVR. One of his projects (not based on AVR) is a pocket LED light. He describes a blocking oscillator based single cell, white LED torch. This and rusty nail project got me thinking and I started experimenting with Chan circuit. The circuit is very robust and it worked with a wide variety of transistors; I tried BC547, 2N2222 and 2n3904.

    But the real fun and challenge was in building an enclosure for this torch. I have been a big fan of matchboxes; as a kid I used to collect empty matchboxes everywhere I went. I thought the art on matchboxes reflected the local culture.

    Long ago, I built a data logger that could fit in a match box (I never completed it in that form, settling to find a much larger enclosure). But now I was determined to fit the white LED torch circuit AND the AA cell in a matchbox.
    Step 1Build the matchbox tray with pieces of PCB

    FIZUXSLAPHEZR7BTDQ.MEDIUM.jpg



    I took a fairly large matchbox and threw away the tray and decided to build my own tray using a technique I had learnt as a radio Ham: to use pieces of PCB and to solder them together to make a faraday cage of any size. I cut three pieces of PCB. I Drilled a large hole to accommodate the 10mm LED in one of the PCBs.




    F57PT1UTHYEZR7BTFU.MEDIUM.jpg



    On another PCB, I made a cutout for the On/Off switch as seen here. The body of the switch was bent and soldered to the PCB so that it was secure.
    Step 3Another view of the switch soldered on the PCB




    F2CZE6HIFKEZR7BTJ3.MEDIUM.jpg


    Another view of the switch soldered on the PCB.
    Step 4Solder the three PCB together




    FCVADN1PFCEZR7BTQX.MEDIUM.jpg


    Solder the three peices together to make the matchbox tray. To solder, start by applying solder on the edges of the PCBs and then align two pieces and apply soldering iron. You may need to hold the solder iron for a little while so that the solder melts nicely. Dont move the PCBs till the solder has cooled off.

    Step 5Solder components and add a side wall to the tray




    FIY5IFVWVBEZR7BTV4.MEDIUM.jpg


    Take another piece of PCB for the side wall of the tray. I used hobby drill to create islands of copper on the PCB. Solder the components on the PCB as per the circuit diagram in the next section.

    Step 6Circuit Diagram



    F987OG1IWJEZR7BV0J.MEDIUM.jpg


    This is the circuit from Chan's website (http://elm-chan.org/works/led1/report_e.html) which I modified and hived off two components. The modified circuit is seen here. The circuit is very robust and it worked with a wide variety of transistors; I tried BC547, 2N2222 and 2n3904. The coil I used had 25 turns each, of 26 gauge wire. Resistor R1 changes the intensity of the light. I tried values between 2KOhm to 220Ohm and I settled for 220Ohm. The light is quite bright at this value.


    Step 7Add the final side wall and fix the 'AA' cell




    FADAKQ3KKOEZR7BV24.MEDIUM.jpg


    Finally, add another PCB for the last side wall. For the cell, I cut a piece of holding spring from an unused cell holder and soldered it on the left wall of PCB in the picture and this forms the negative terminal of the cell. To isolate the positive terminal of the cell, I again cut an island on the right hand side of the PCB and soldered a wire to the switch as seen in the picture.

    Step 8Slide the tray in the matchbox cover!




    FYDWLQ715LEZR7BV4I.MEDIUM.jpg


    This completed tray slides in nicely in the matchbox cover. If the tray doesnt slide in smoothly, file the edges that may be obstructing.

    Step 9And switch it on!


    FMLEAOPX8CEZR7BV6X.MEDIUM.jpg


     

    dayamperera

    Active member
  • May 31, 2008
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    seevice need

    kawruhari innawada home visited laptop repair karana kenek
    kiribathgodata kittuwanam godak hondai.
    pm ekak denna mata.