Strobe complete and working - sort of !!

Discussion in 'Strobes - LED or Others' started by fj, Jan 18, 2011.

  1. fj

    fj Apprentice Elf

    Joined:
    May 7, 2010
    Messages:
    89
    Likes Received:
    0
    hi,

    i'ev completed a strobe (fully populated board with 2 wires, pins 2 / 4 jumpered) powered from a 5V switch mode power supply.

    the strobe works and pulses as expected BUT the LED itself never goes off completely between cycles, it always stays on at about 1/3 brightness until it has to strobe at which time it becomes full brightness.

    any ideas on where to look for the problem?

    thanks, fj
     
  2. Tabor

    Tabor Full Time Elf

    Joined:
    May 16, 2010
    Messages:
    249
    Likes Received:
    0
    Location:
    Perth, WA
    Sounds like you may have a short or solder bridge around the transistor.
     
  3. David_AVD

    David_AVD Good news, everyone!

    Joined:
    Jun 12, 2010
    Messages:
    3,338
    Likes Received:
    20
    Location:
    Victoria Point (Brisbane)
    Pictures of PCB please!
     
  4. OP
    OP
    fj

    fj Apprentice Elf

    Joined:
    May 7, 2010
    Messages:
    89
    Likes Received:
    0
    i checked the board for bridges but couldn't see any, but afer looking at these tiny parts for so long today i might have missed something so i'll check again tomorrow. and take some pics to post up too.
     

Share This Page