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Thread: reversed ttl signal

  1. #1
    Join Date
    Apr 2009
    Posts
    9

    Default reversed ttl signal

    hello everybody

    i have a 30mw 532nm laser diode from an old projector (jb system stealth)
    i use the laser diode in my new built projector to test it

    but the problem is that the ttl signal is reversed, 0v = on 5v = off (on the module driver)

    is there any way to fix this

    later today i will put some pics of the driver online

    its a crappy laser but fun for test purpose

    thanks for the help

    greetings robbert



    the wires - bottom left = power
    upper right = ttl
    lower right = diode
    Last edited by nightvision; 10-27-2009 at 09:30.

  2. #2
    Join Date
    Jan 2009
    Posts
    1,622

    Default

    Usually your software should allow you to invert the modulation signals.. if necessary you could run the modulation signal through a 7404 inverter..
    Last edited by ElektroFreak; 10-27-2009 at 09:49.

  3. #3
    Join Date
    Dec 2008
    Location
    Canada
    Posts
    972

    Default

    Or even a 1 transistor inverter buffer.. (1 transistor + 2 resistors)...

    Jerry
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