Cmos 555 long duration flyback led flasher

Discussion in 'Feedback and Suggestions' started by ajventi, Dec 13, 2013.

  1. ajventi

    Thread Starter New Member

    Dec 3, 2013

    Maybe I'm not seeing it right, but when the first timer output goes high that should switch off Q1, pulling Pin 4 of the second timer to ground, and shutting off the second oscillator.

    So it's the high of the Inverter Q1 turning on the second timer, rather than the high of the first timer, which shuts off the second timer.

    I think this needs to be explained more clearly.
  2. Wendy


    Mar 24, 2008
    I am the author of that little piece. Q1 is a simple logic inverter. I think I explained that pretty clearly, the 97% on time for the first astable multvibrator had to be inverted. Definition of logic inverter, logic 1 in = logic 0 out.