Toy phone

Discussion in 'General Electronics Chat' started by Nathan Hale, May 8, 2015.

  1. Nathan Hale

    Thread Starter Active Member

    Oct 28, 2011
    125
    2
    Hello folks! hope all is well!

    Below you will find 2 pictures of my daughter's toy phone. It is a very simple toy which has 3 buttons. When a button is pushed you hear a voice say "hello" or "bye" or "may i help you".
    I had to open the toy this afternoon to but back a button that came off.
    What amazed me was the lack of any huge circuitry inside ( as you can see in the pics)
    there was just one small resistor on one side and a black blob of something on the other side.
    Can you please tell me how the voice was put into this toy?
    Can you also let me know what the black blob is?

    thank you for your replies. Toyphone2.JPG Toyphone1.JPG
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,442
    3,361
    The black blob is the complete microcontroller chip that was preprogrammed with the desired voice messages.
    The black blob is commonly seen in low cost high volume electronic devices such as pocket calculators, digital clocks, TV remotes, etc.
     
  3. Nathan Hale

    Thread Starter Active Member

    Oct 28, 2011
    125
    2
    Is there an official name for these blob microcontrollers?
     
  4. MrChips

    Moderator

    Oct 2, 2009
    12,442
    3,361
    The chip is the same as other chips in the manufacturing process, only the packaging is changed.

    When a chip is being made it is placed on a platform and connecting wires are bonded between the IC pins and the chip. It is then encapsulated in plastic, epoxy or other materials to give us the chips we commonly see.

    [​IMG]

    With the "blob" the chip is mounted directly to the PCB and bond wires connected to the PCB traces. This is known as glob-top or chip-on-board (COB) assembly.

    [​IMG]

    upload_2015-5-10_4-48-53.jpeg

    http://en.wikipedia.org/wiki/Electronic_packaging

    [​IMG]

    http://keshavchinna.blogspot.ca/2012/03/cob-ics.html
     
    AnalogKid likes this.
  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
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  6. ian field

    Distinguished Member

    Oct 27, 2012
    4,415
    784
    AFAIK: its "COB" for "chip on board".
     
  7. ian field

    Distinguished Member

    Oct 27, 2012
    4,415
    784
    Recently I found an all glass HD44780 compatible LCD module that was listed as "COG" for "chip on glass".

    Its getting everywhere these days!
     
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