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Lassie
07-14-2010, 06:03
Hi there,

I bought a home made laserprojector with the following specs (short)

DT40 Pro scanners
1 watt Viasho VA-II-N-532, 532nm laser (output 1,6 watt)

On the back of the laserprojector are 2 switches.

can someone please tell me exactly what they mean?

http://s749.photobucket.com/albums/xx132/IG_100/Laser/?action=view&current=IMG_0227.jpg

I know what TTL and Analog means, but Why the + and - ?
The OX+ and OX- doesn't ring a bell to me.

Please help me out

300EVIL
07-14-2010, 06:51
It most likely inverts the X galvo channel signal to mirror the image. Good if you are doing scrim versus wall projection.

gottaluvlasers
07-14-2010, 06:51
im not 100%-

but my guess would be polarity of scanning. change up to down or right to left.

-Marc

Doc
07-14-2010, 08:48
I'd say it was positive blank or negative blank selection.

Lassie
07-14-2010, 09:00
Thanks Doc.

Can u explain to me what that is?

Doc
07-14-2010, 09:32
TTL lasers can be either on or off (no dimming ability). Some TTL lasers need a 5v signal to switch them on, some, some need a 5v signal to switch them off (blank). This second configuration is quite dangerous, as if the input modulation signal was to become disconnected; the laser will switch on at full power.

I'm guessing that your projector gives you the choice to suit different TTL DACs (the DAC: Digital to Anologue Converter)is the interface box between your computer and the laser projector), though as it has an anologue option; that would be the prefered mode.

Analogue lasers are able to adjust their brightness relative to a modulation signal of between 0v and 5v.

Ian

Lassie
07-14-2010, 09:38
Thanks again doc,

I looked inside the projector and the laserdriver is set to TTL...should i set it to ang?

gottaluvlasers
07-14-2010, 18:16
Doc-

if you look at the picture he posted, there is a dedicated switch for TTL+/TTL- and analog. The ox+ and ox- is next to that.

my guess is still for scanning reverse.

Lassie-

yes, ideally you would want it set to Analog. this provides fading capabilities. TTL is either full on or full off. Analog provides a "ramping" brightness depending on the input signal

-Marc

norty303
07-15-2010, 03:59
Surely the best way of finding out, rather than us all sat here guessing, is to just plug it in and move the switch and watch what happens.

Doc
07-15-2010, 08:18
So it does :o could also be an option for float high, ground to blank?

My thinking here is to do with the 'O' the international symbol for 'off' (blank)?

^^ +1 what Norty said ^^