IR diode and phototransistor

Discussion in 'General Electronics Chat' started by Eric007, Oct 21, 2013.

  1. Eric007

    Thread Starter Senior Member

    Aug 5, 2011
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    Hi Everything Ok with this schematics?
    Highlighted part?

    Vdd = 5V

    Thanks!

    Edit: pdf file removed + schematics
     
    Last edited: Nov 7, 2013
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,570
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    I might have gone lower with the diode resistor for the opto, they are rated for up to 50ma, yours will be something less than 5ma taking in the voltage drop for the diode.
    Max.
     
    Eric007 likes this.
  3. Eric007

    Thread Starter Senior Member

    Aug 5, 2011
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    Here are the new changes based on the other 2 attached...

    don't have 3k so put 2k2 at comparator output...
    Anything missing or ...

    Edit: schematics removed
     
    Last edited: Nov 7, 2013
  4. John P

    AAC Fanatic!

    Oct 14, 2008
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    The 10K resistor (R2) might or might not be right, depending on the amount of light that passes from the LED to the transistor, and that depends on alignment and distance, neither of which have been mentioned. Then you have the issue of ambient light: if this rig must operate in daylight or incandescent illumination and there isn't any shielding of the receiver, you risk having the sensor say "I'm seeing light" all the time. If that's the situation, you'd most likely need to go to a modulated-light setup.
     
  5. Eric007

    Thread Starter Senior Member

    Aug 5, 2011
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    There's no R2 with value 10K...R2 value is 330

    Edit: Schema edited...Check R15

    schematics gone!
     
    Last edited: Nov 7, 2013
  6. John P

    AAC Fanatic!

    Oct 14, 2008
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    R2 in the middle diagram, posted Today, 06:13 AM? I think that's your R10.

    R15 in the diagram of Today, 08:12 AM doesn't seem to serve any function. Why have it there at all?
     
  7. Eric007

    Thread Starter Senior Member

    Aug 5, 2011
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    Have a look at very first post pdf attachment
     
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