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Help Please you GR

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  1. [1]
    هندسة رابعة
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    عضو

    تاريخ التسجيل: Nov 2007
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    Help Please you GR

    Hi
    I connected the IR Repeater circuit part by part but:
    1) The Led that must be off for testing was on with no input ( Why is that?)

    2) The oscillator has no clear signal on the screan ( I connected it on the 2.2k resistor), but when I point the ir signal at the photodiode as I get closer to it the amplitude became larger.

    3) I know that the function of the photodiode is to convert ir signal to current in order to deal with it in an electronic way rather than electromagnetic way, but , on the hand when I tryed to measure the current that is passing through 3.3k resistor , there was a very small reading (0.006mA) after pointing the ir signal , is that true? or does this indicates that the photodiode does not work properly? How can I test a photodiode?

    Please Answer ASAP, I need to try your suggestions.
    Thanks

  2. [2]
    ماجد عباس محمد
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    مشرف متميز


    تاريخ التسجيل: Sep 2006
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    [LEFT]Hi
    I connected the IR Repeater circuit part by part but:
    [COLOR=purple]1) The Led that must be off for testing was on with no input ( Why is that?)
    The IC you use is a full function IR chip, this means it is sutable for IR remote control signal, which is a signal on a 38 KHz carrier
    Download the data sheet to understand its operation
    the IC output is 0-5V
    Also It may need a pullup resistor on its putput pin try 47K ohms
    2) The oscillator has no clear signal on the screan ( I connected it on the 2.2k resistor), but when I point the ir signal at the photodiode as I get closer to it the amplitude became larger.
    You should connect it between LM555 pin 3 and ground which is the output pin
    if the IR chip has an output, then 555 will oscillate

    3) I know that the function of the photodiode is to convert ir signal to current in order to deal with it in an electronic way rather than electromagnetic way, but , on the hand when I tryed to measure the current that is passing through 3.3k resistor , there was a very small reading (0.006mA) after pointing the ir signal , is that true? or does this indicates that the photodiode does not work properly? How can I test a photodiode?
    This is a chip not an IR diode so you cant measue the IR current , you read the total chip current

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