Smoke Detector

Discussion in 'The Projects Forum' started by chal-lo, Sep 12, 2012.

  1. chal-lo

    Thread Starter New Member

    Sep 10, 2012
    6
    0
    Hi there,

    I am starting with IC Electronics and was trying to decipher how a smoke detector works. The manufacturer is Electro DH and the model name is 50.606. I have searched for a diagram but haven't found any.

    My problem is that I am trying to identify the Logic Family chip in the middle. I have tried to read it but I don't reach it. Any ideas?

    I provide a picture to see if anyone manages to figure it out.

    Many thanks in advance.

    Chal-lo
     
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  2. wayneh

    Expert

    Sep 9, 2010
    12,093
    3,031
    Get a bright light and a magnifying glass to see if you can read the markings on the IC. Sometimes you can only read them at just the right light angle.

    I would have guessed quad op-amp or comparator, but it's got too many pins for that.
     
  3. #12

    Expert

    Nov 30, 2010
    16,257
    6,757
    In today's world, it could even be a tiny microprocessor.
     
  4. chal-lo

    Thread Starter New Member

    Sep 10, 2012
    6
    0
    Well I tried to do so, but it seems to be already partially scratched and reach to get only like 1 or 2 digits.

    thanks any way.

    Perhaps any other circuit for which I could get a diagram would be valid. Do you know of any reliable circuit?

    Many thanks for your help.
    Chal-lo.
     
  5. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    Google: smoke detector IC

    You might be able to reverse engineer the PCB layout to a schematic, and then compare component connections to the datasheets for the various smoke detector IC listed in Google.

    Ken.
     
  6. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    You are not going to see or read the part number off of the IC, since the manufacturer of the smoke detector seems to have wiped/scratched it off so people can not do exactly what you are doing, reverse engineer it. A lot of manufacturers will do that to prevent people from figuring how it works or what devices they used.....
     
  7. ScottWang

    Moderator

    Aug 23, 2012
    4,853
    767
    if you want to know more about the model 50.606, then you should do as KMoffett said at the #5.

    The following circuit was copy link from another Big5 forum in Taiwan.
    http://gc.digitw.com/new_page_21.htm

    [​IMG]
     
    #12 and absf like this.
  8. wayneh

    Expert

    Sep 9, 2010
    12,093
    3,031
    An LM358 doesn't have 16 pins. ;)
     
  9. ScottWang

    Moderator

    Aug 23, 2012
    4,853
    767
    I didn't mean that the IC of the circuit that I linked is equal to the model 50.606, it just shows that used another way to completed the same function.

    The circuit that I linked, it's working good, because I did take care some people's problem.

    There is another smoke detector used 16 Pins IC.
    RE46C190 photoelectric smoke detector
    http://electroschematics.com/2545/smoke-detector-circuit/
     
    Last edited: Sep 13, 2012
  10. MrChips

    Moderator

    Oct 2, 2009
    12,421
    3,357
    The IC is a Photoelectric Smoke Detector made by Motorola (now Freescale), MC145010 or MC145011.
     
  11. absf

    Senior Member

    Dec 29, 2010
    1,492
    371
    Could it be MC145012? I traced the circuit and P11-R13-LED-Vcc. Datasheet attached.

    I think the OP turned the PCB over, take a photo and mirrored the picture so the pin 1 of the chip alligned to the right of the PCB... Very smart...:D:cool:

    Allen
     
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