reversed ttl signal

[nightvision]

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

[ElektroFreak]

Usually your software should allow you to invert the modulation signals.. if necessary you could run the modulation signal through a 7404 inverter..

[lasersbee]

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

Jerry