1. We will be in Read Only mode (no new threads, replies, registration) starting at 9:00 EDT for a number of hours as we migrate the forums to upgraded software.

Remote photo flash light-activated trigger

Discussion in 'General Electronics Chat' started by Dunc, Oct 22, 2004.

  1. Dunc

    Thread Starter New Member

    Oct 22, 2004
    Surfing the net I have found several circuits to do this. I want to trigger 3-4 electronic flashes (in addition to the one on-camera). Each remote flashwould have its own.

    Bought commercially, these would run up quite a bill. The build-it-myself designs still use a handful of components but would be acceptable.

    Before I follow up I did find a reference (no schematic, no other description) that suggested a lascr would do it and a lot fewer components would be required.
    Sounds great.

    I know what a lascr is but have no idea how to create a functional circuit.

    Please, can anyone suggest a circuit? Nothing fancy but a sensitivity control (to prevent firing by ambient room lighting) would be a plus.

    Thank you.
  2. mozikluv

    AAC Fanatic!

    Jan 22, 2004

    am not sure if by using a laser activator would entail lesser parts than the usual IR tx/rx circuit. and besides it's more costly. :(
  3. beenthere

    Retired Moderator

    Apr 20, 2004

    If you have a photoflash unit available, you might be able to do some reverse engineering. The lascr should approximate the function of the manual pushbutton.

    I don't think ambient light will be much of a problem - at least not is you need flash. The trigger will be the "factory" flash unit, and the brillance and sharp onset should allow accurate lascr operation. You can always set up a test circuit to see if this assumption is correct. The lascr will remain latched on with DC applied. Set one up with a battery and led, such that the led will illuminater if the lascr is triggered. See if things work the way you want.