how to build this?

Discussion in 'The Projects Forum' started by talzer, Dec 7, 2009.

  1. talzer

    Thread Starter New Member

    Dec 13, 2008
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    im not so good in electronics but can i know how to build of these thing?
    http://www.youtube.com/watch?v=Rwp_f1Y2vM8

    just helping my son in some simple project. just in case there are information that can be provided here, i might help him out a bit.

    thanks
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
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    When is that thing flashing?
     
  3. Brother_of_the_wind

    New Member

    Dec 7, 2009
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    Looks like they are using a simple pic with a single RGB LED. It will require a programmer so it may not be doable in your situation.

    Les...
     
  4. talzer

    Thread Starter New Member

    Dec 13, 2008
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    basically this thing will flash when they is an incoming call
    i believe it is activated by some sort of phone signal but i'm not sure with the component inside it.
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    This is somewhat of a paradox.

    I could see that the flashing LED could be very useful to alert a hearing-disabled (aka deaf) person to alert them to an incoming call.

    But why alert a deaf person to an incoming call from a cellular telephone?

    Of course, text message alerts, etc - would certainly be apprapos.

    This thing may likely be brand-specific.
     
  6. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Cell phones stores sell many flashing antennas. I think it has a rectifier that is powered from the transmitted signal. The cell phone transmits that it is turned on when it is ringing from an incoming call.
     
  7. talzer

    Thread Starter New Member

    Dec 13, 2008
    8
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    can you be more specific on the rectifier, and the components involved?
    so basically this thing no need batteries?
     
  8. CDRIVE

    Senior Member

    Jul 1, 2008
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    Good call. ;)
     
  9. BMorse

    Senior Member

    Sep 26, 2009
    2,675
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    quite a few of these devices I have come accross use a couple of small button cell batteries.... if not, it would have to be pretty close to the antenna of the cell phone (some devices that replace your existing cell phone antenna which light up when the phone rings, most of those do not have batteries)...
    They battery less ones work almost similar to an RFID tag, when a certain frequency is picked up by the RF coil, it converts this to power to flash the LED....

    My .02
     
  10. BMorse

    Senior Member

    Sep 26, 2009
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  11. mkbutan

    Senior Member

    Sep 30, 2008
    270
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    BMORSE is right
    They battery less ones work almost similar to an RFID tag, when a certain frequency is picked up by the RF coil, it converts this to power to flash the LED....
    yes
    you are right; it is a microwave receiver without a battery
    when there is an incoming or outgoing call the coil near to cellphone it get energize & start blinking with the help of 1 transistor;capacitor;LED all SMD's
     
  12. mkbutan

    Senior Member

    Sep 30, 2008
    270
    16
    There is no spoon -Neo-:cool:
    Disclaimer: The example programs,circuits, projects and information I provide or post on this web site are for educational purposes only. By copying anything from this site posted by me, you agree to the "as is" nature of the programs, circuits, information and to the statements listed in this disclaimer.No warranty or liability is expressed or implied. Working with AC /DC voltages can be dangerous and even deadly. Proceed at your own risk!


    Good i like it
     
  13. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
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    I'll admit that the luminescence in the video seems quite substantial but I would think a NE2 would light if placed near the antenna.
     
  14. talzer

    Thread Starter New Member

    Dec 13, 2008
    8
    0
    although i can't understand certain electronic terms here, but will try to digest them lol

    thanks for the respond
    is these possible components pricey in the market?
     
  15. BMorse

    Senior Member

    Sep 26, 2009
    2,675
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    I am not sure how much they are going for in the market, but I just ordered some samples from the company for free (4 pcs) !:D
    I have always been intrigued by these detectors and I have never messed around with RF circuits, so this will be my first project involving RF detection:rolleyes:.
     
  16. talzer

    Thread Starter New Member

    Dec 13, 2008
    8
    0
    can anybody provide examples of schematic diagram to test it out?
     
  17. BMorse

    Senior Member

    Sep 26, 2009
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    this is the basic hookup for this IC....
    apparently the cost for the IC is anywhere between $1.25 to $1.31 depending on model...
     
  18. BMorse

    Senior Member

    Sep 26, 2009
    2,675
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    Just got my samples in today so tonight I will see about getting these mounted on something to test them.... pretty small for bread boarding, plus extra capacitance in the breadboard might cause issues.... so I will have to break out one of my trusty Dremmel's and get carving a PCB adapter for it... :)
     
  19. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
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    Wouldn't that require an electric field strength on the order of 100V/mm (100kV/meter)?
     
  20. BMorse

    Senior Member

    Sep 26, 2009
    2,675
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    Well, just ran a PCB for the sample IC, it was a little pain in the a$%:rolleyes: to solder the IC on but got it done.... now just have to plug it into a breadboard connect it to the scope and see what I've got!

    Although, If it does work, it will be going hay wire with signals coming from the WiFi routers and my daughters phone calls (2.4Ghz cordless phone) and texting (cell phone) all at the same time:mad:.... I guess I will have plenty of signals for testing :D

    TLC5531_PCB.jpg

    TLC5531_PCB_ASM1.jpg

    TLC5531.jpg
     
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