TTL Modulation

[Ref]

What is it, and what does it allow you to do, exactly? I searched the forums and got 2 threads, neither of which explain its purpose.

 

[rog8811]

On a scanner you sometimes need to be able to move the mirrors without a laser line being drawn.  TTL blanking will turn the laser off.

An example, if you project a word in capital letters the blanking can be used to make sure that the letters are not joined together by a line, that part is blanked.

TTL modulation I think means to adjust the intensity of the beam rather than fully blanking it. On RGB laser projectors that would allow you to have a wider colour pallete.

Hope that helps.

Regards rog8811

 

[knimrod]

"TTL" means Transistor-Transistor Logic. The term is a hold-over from the old days meaning a 0-5 volt discrete on-off signal. IE: TTL modulation means 0V = off, 5V = on (or vice-versa).

"Analog modulation" would mean a varying input signal would vary the intensity of the laser.

 

[Ref]

Gotcha. Thanks, guys

 

[andy_con]

http://www.laser-man.co.uk/2006/index.php?option=com_content&task=view&id=63&Itemid=72