Robonz wrote:Harry, what kind of laser specs would you recommend for this? 405nm mW??. Is the scan rate able to be sped up using a more powerful laser? Also what software are you using to generate the signal?. I never looked at SSTV but now I saw your glow drum it sparked my interest. i hope I did not ask too many questions.
Cheers
Keitb
Hi Keith Yep UV laser at around 20mW as i recall i would of got 50mW....just what i could get deal wise at the time its bright enough for the scanning ..
viewtopic.php?f=23&t=1318&start=105Above before and after i opened it up with the dremel .....plus you need to be able to focus it also you need the raw laser diode not the regulator.... it will filter out the video reason i had to hack it open .
So with that in mind you know what you need what ever you get need to be able to get at the laser diodes pins !
I have half made a tiny version of it with plans on just using dc motors cut out the electronics in the stepper motors ...the frame motor for the little drum is geared for slow speed and have a 4 sided mirror on a flat dvd cd dc motor for the line side of it ...because the line is dc motor controlled it will be very hard to control it will have to be synced .
My plans here are i will use the idea that has worked in the past on using the corners of the mirror with a opto switch for making the mechanical sync this worked very well in past projects with polygon mirrors for the mechanical sync ..planning on the same system as in NBTV motor control but this time using the sstv line sync in the 4046pll or bistable 555 control circuit .
Its very easy to get a picture once your laser modulation works all you have to do line up the lines of your picture i could do this in manual control of the steppers speed ...they still drift but a slight adjustment puts them back on track they are pretty good on staying close to speed.
I made my original monitor drum motor out of junked laser printer stepper motor and the line mirror was glued on a 5inch floppy stepper ......bipolar or unipolar either are ok so there are 2 ways to go motor wise its up to you what you would rather .
The software i used both MMSSTV and chromapix
http://nk7z.net/mmsstv/http://www.barberdsp.com/index.php/sili ... downloads/Both have the 8 second SSTV but with the robot vis code the original system didn't have that code ...not much of a problem for this but there are true video files on this section of the forum Steve Anderson has made and there are old video files on you tube .
SSTV is fun made a p7 CRT monitor a while back ...
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