strobe circuit

Discussion in 'General Electronics Chat' started by kell, Jan 20, 2005.

  1. kell

    Thread Starter New Member

    Jan 20, 2005
    4
    0
    I want to build a circuit that flashes a strobe ten times a second. From what I understand the typical camera strobe has a little converter that charges a cap to a few hundred volts and the cap gets dumped into the strobe light for the flash.

    I'm sure this is the kind of thing that has been done a million times. Maybe I could get a a surplus camera strobe circuit from one of the surplus suppliers like allelectronics or goldmine. If it can charge in 1/10 sec I can just hook it up to a 555. I'm not so sure just any randomly acquired camera strobe would charge up that fast, though.
    I was also thinking I could use an inductor to provide the energy for the strobe. Use a timing circuit to ramp up the inductor and then when the inductor gets cut off, the spike diverts through a diode into the strobe. Maybe this is not standard practice, but I have some experience building inductive switching circuits using timers and mosfets or igbts.
     
  2. Brandon

    Senior Member

    Dec 14, 2004
    306
    0
    The converter your talking about is infact an inductor style of circuit in those cameras. Ripped one apart a while ago for a school project and it operates off of a switching inductor to generate the high voltage.
     
  3. kell

    Thread Starter New Member

    Jan 20, 2005
    4
    0
    Yes I know. Just a little SMPS that charges a cap. I meant eliminate the cap -- fire the strobe directly off an inductor.
     
  4. Nettron

    Member

    Jan 22, 2005
    29
    0
    To elliminate the capacitor you'll prolly have to use a "beefier" supply. Most HV flash circuits use a relaxation type oscillator ( such as blocking) to deliver DC pulses into a small step-up transformer that dumps charge into a holding capacitor. A HV diode prevents the cap from discharging back thru the transformer windings and when the charge on the cap reaches the ignition voltage required to ignite the gas in the strobe, a comparator driven LED will indicate that its ready. Then just say "cheese". :D
     
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