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Infrared transmitter/receiver ?

Discussion in 'Electronic Basics' started by Zucker, Jul 16, 2004.

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  1. Zucker

    Zucker Guest

    I am in the process of making an infrared transmitter/receiver circuit. The
    transmitter is made up of an infrared LED in series with a 180 ohm resistor.
    The receiver is made up of infrared transisitor in series with a 50k pot.
    The junction of the transistor and pot is sent to the input of an LM324
    configured as a comparator.

    I can only space the transmitter and receiver two feet apart before the
    comparator's output goes from high to low.

    I need the circuits to be four to six feet apart. Does anyone have any
    suggestions on how to increase the distance?

  2. Zucker

    Zucker Guest

    I forgot to mention that both circuits are running off of 9V batteries
  3. John Fields

    John Fields Guest

    1. Get an IRLED with a narrower beam.
    2. Get an IRLED with a higher power output.
    3. Pulse the LED you're now using close to its maximum current/duty
    cycle limit.
    4. Collimate the output of the LED you're now using.
    5. Match the LED and phototransistor's wavelengths.
    6. Drive the LED with a 40kHz carrier modulated on-off and use a 40
    kHz receiver to recover the modulation.
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