simple oscillator?

Discussion in 'General Electronics Chat' started by Lem0nHead, Oct 27, 2010.

  1. Lem0nHead

    Thread Starter New Member

    May 4, 2009
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    hello
    I need a 38 kHz square-wave generator (for an IR LED), but it needs to generate the 38 kHz square-wave for 1ms, and stop generating (LOW) for 1ms

    I can't use too many components/routes (the single layer board must have at most 16mm/0.6inches width)

    I guess a microcontroller would probably be a good idea, but is it possible to do that with a few resistors/capacitors using a 556 as schmitt trigger (or even a 74c14/similar)?

    thanks
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
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    I guess you could use a 556, and the reset pin on the 38 HHz osc to gate the signal
     
  3. Lem0nHead

    Thread Starter New Member

    May 4, 2009
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    0
    yes, but I guess I'd need enough components that wouldn't fit on a 0.6inches single-layer board

    for instance, I tried to do that: [​IMG]
    (got it from http://forum.allaboutcircuits.com/showthread.php?t=26272&page=2 ), and it gets wider than 1 inche
     
  4. t06afre

    AAC Fanatic!

    May 11, 2009
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    I guess then a 8 or 6 pin micro would be the best. Many of them come with internal osc. So you will only need the chip and a 100nF decoupling cap.
     
  5. Markd77

    Senior Member

    Sep 7, 2009
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