i am an absolute newby

Discussion in 'General Electronics Chat' started by geek42b, Aug 26, 2014.

  1. geek42b

    Thread Starter New Member

    Aug 26, 2014
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    so, i ask a newby question. what is the black round bump in the middle of this little circuit. the circuit is a blinking led shoelace i purchased to take apart. i am guessing the black bump is there to help in the production process.

    sorry my shift key does not work on my pc.
     
  2. Externet

    AAC Fanatic!

    Nov 29, 2005
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  3. crutschow

    Expert

    Mar 14, 2008
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    The black bump is likely epoxy covering the electronic chip the controls the blinking.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    It's a blinkin' blob I say.
    Max.
     
  5. geek42b

    Thread Starter New Member

    Aug 26, 2014
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    thanks for the qucik reply.
     
  6. misael.mata

    Member

    Aug 26, 2014
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    hello there, i am also new and just wanted to know if you have some type of knowledge on hoe car amplifiers work internally....
     
  7. wayneh

    Expert

    Sep 9, 2010
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    Don't hijack this thread - please go ahead and start your own.
     
  8. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    It's called drop shot around my parts, it is a epoxy protective encapsulation for a base chip placed and wire bonded directly to the PCB.

    Why this works out cheaper then solder in high column production is beyond me.
     
  9. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Because the bare chips come dirt cheap with 4 leadwires bonded, and a 16yr old Chinese girl (on $2 a day pay) sits there all day with a magnifier soldering those 4 wires to the PCB times many hundreds of chips, then another Chinese girl squirts some black goop over them.

    Basically because their labour is so much cheaper than the cost of "proper" injection molded and tested DIP or SOIC chips. Which still need to be soldered by a Chinese girl.
     
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