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Thread: IR Communication by using PT2248/PT2249A

  1. #16
    Jack of all trades DonL's Avatar
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    Terry needs to make an Electronics Forum.

    That way we don't mess up the Electrical Forum, With the Good stuff.
    And the argument about Ground Fault Interrupts can continue with out Interruptions.


    Just my thought.


    I hope everyone is having a great day. We missed you JW I hope all is well. Don't let your meat spoil.


    DonL
    Theory only works perfect in a vacuum.

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  2. #17
    DIY Senior Member BobL43's Avatar
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    Don, you are right about maybe an electronics thread.

    And I agree with you on the Casey thread; everything you said. Just don't bust a gut over it; there should be a bullshit thread and all those USA bashing posts by Ian moved to it.
    I am definitely not a pro plumber, but I am a pro crastinator

  3. #18
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by BobL43 View Post
    Don, you are right about maybe an electronics thread.

    And I agree with you on the Casey thread; everything you said. Just don't bust a gut over it; there should be a bullshit thread and all those USA bashing posts by Ian moved to it.
    LOL , I just blew my top.

    Guess my blood pressure went high.

    Went to health and wellness and it just went higher.

    Guess i need some crack...

    My girl will be home soon. She will take care of the pressure.


    Enjoy your weekend.


    DonL
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

  4. #19
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by munhann View Post
    TX IR Component List
    - C1 = C2 = C3 = 120pF, C4 = 10nF (Polarized Capacitor)
    - XTAL = 455Khz
    - D1 = IN4002 and D2 = IN4148
    - Q1 = Q2 = PNP A1015
    - LED0 = Infrared Transmitting LED


    Your Parts list says Q2 is a PNP, While the schematic shows a NPN.

    That could very well be your problem. You may want to double check that because it has to be a NPN.

    The part number for Q2 should be 2SC1815.


    DonL
    Last edited by DonL; 07-09-2011 at 06:55 AM.
    Theory only works perfect in a vacuum.

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  5. #20
    DIY Senior Member BobL43's Avatar
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    Good catch Don. Base polarity is an important thing. So what do they call that output, a cascaded emitter follower or something like that?
    I am definitely not a pro plumber, but I am a pro crastinator

  6. #21
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by BobL43 View Post
    Good catch Don. Base polarity is an important thing. So what do they call that output, a cascaded emitter follower or something like that?
    No a cascaded emitter follower uses the same type of transistor, Typically 2 NPNs, I do believe.

    It is a complementary pair.

    I personally do not like to direct couple transistors, I would have put a 1K resistor on the base of Q2.
    But that is a mater of personal preference.

    With a limiting resistor at least if one transistor gos bad, It don't take out the other.
    Then you have to add more smoke, because it all gets let out. lol


    I hope You are having a enjoyable Weekend.


    DonL
    Last edited by DonL; 07-09-2011 at 07:15 AM.
    Theory only works perfect in a vacuum.

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  7. #22
    DIY Senior Member BobL43's Avatar
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    Just finished cutting the grass, so now its time to cool off.

    Factory smoke is hard to find these days!
    I am definitely not a pro plumber, but I am a pro crastinator

  8. #23
    Jack of all trades DonL's Avatar
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    I wonder what ever happened to this IR system ?

    Did you get it working munhann ?


    DonL
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

  9. #24
    DIY Senior Member BobL43's Avatar
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    So munhann?> you out there somewhere?
    I am definitely not a pro plumber, but I am a pro crastinator

  10. #25
    DIY Junior Member PipeInspection's Avatar
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    Realize this post is old. I'm new here and wondering if anyone has plans to Built a 512 Hz Transmitter. I found plans to build a Transmitter Tracker, but not sure how to turn it down to 512.

    512 is AM correct?

    Thanks in advance,

    Paul

  11. #26
    DIYer, not in the trades LLigetfa's Avatar
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    Quote Originally Posted by PipeInspection View Post
    512 is AM correct?
    AM as in Amplitude Modulation? It is within the human vocal range. Middle C on the piano is 256 Hz.

  12. #27
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by PipeInspection View Post
    Realize this post is old. I'm new here and wondering if anyone has plans to Built a 512 Hz Transmitter. I found plans to build a Transmitter Tracker, but not sure how to turn it down to 512.

    512 is AM correct?

    Thanks in advance,

    Paul
    Depending on the bandwidth it can be am/fm/cw/ssb or whatever you design it for. I would think CW is the norm, if you plan to use it as a Pipe locator.

    512 HZ is in the Audio range , so why not just use a audio generator / or a 512 HZ tape recording and a speaker ?
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

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