Query on TSOP

Discussion in 'General Electronics Chat' started by deepsamal, Feb 5, 2010.

  1. deepsamal

    Thread Starter New Member

    Mar 10, 2009
    1
    0
    how many ir leds can a 555 ic drive at 38 khz, astable mode. we are using 5 tsop and circuit becomes very complicated if 5 different 555 ics are used for 5 ir led .
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You have not mentioned the specifications of your IR LEDs or what Vcc you are using.

    You could simply use transistor or MOSFET driver(s) for the LEDs.
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    What is the exact data of the IR leds?
    What is the power supply voltage?
    You can always use a transistor or a mosfet as a buffer for the leds.

    Greetings,
    Bertus
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    A 38kHz TSOP IR receiver IC will reduce its gain when it receives continuous 38kHz IR pulses. The datasheet explains that the 38khz must be in "bursts" which is groups of 38kHz pulses and it says how many pulses in each burst. Use a second 555 to make the bursts by gating the 38kHz oscillator on and off.
     
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