airliner strobe

Discussion in 'The Projects Forum' started by tahoe, Aug 23, 2010.

  1. tahoe

    Thread Starter New Member

    Aug 22, 2010
    Hello everybody. I am new to this forum, (and to electronics). I am struggling to come up with a strobe for a model airliner: wing tips and red top and belly.
    Found a calculator that gave me this formula with the 555: R1 22K ohm
    R2 1K OHM, C 100 uf, T1 off 1663 millisec, T2 flash 138 millisec, Hz 0.000554,
    I am trying to get the flash every second and a half or so, but I get the opposite effect: the led stays on for 1.5 sec, then a brief off.
    What I am missing. Can somebody point me in the right direction? Thanks.
  2. Wendy


    Mar 24, 2008
    Try turning the LED around and connecting it to the other power supply lead (+). This will invert the flash signal.

    Have you seen these?

    3. The 555 Projects

    They show how you can do this.
    Last edited: Aug 23, 2010
  3. Bernard

    AAC Fanatic!

    Aug 7, 2008
    This is what Bill was suggesting. The flash time is controlled by R2 & C, idle time by R1+R2 & C.
  4. tahoe

    Thread Starter New Member

    Aug 22, 2010
    Thanks for the answer. Such a simple fix.
    I have a strobe!