Actions
Engagement
  • Author Author: pchan
  • Date Created: Date Created
  • Last Updated Last Updated:
  • Views 1249 views
  • Likes 4 likes
  • Comments 6 comments
Related
Recommended

Ben Heck’s Mechanical Television Part 1 Episode -- Episode 230

image

element14's The Ben Heck Show

Join the Ben Heck team every week for amazing hacks! Watch them build and mod community-inspired projects using electronics!

Back to The Ben Heck Show homepage image

Connect with TBHS
Featured Bonus Materials
See All Episodes

 

 

In this episode Ben begins making a mechanical television using old records, a flash light, a drill motor and some Photoresistors.

Supporting Files

Click Herefor access to all the supporting files you will need to replicate this build!
Parents

  • Baird's process of image capture seems quite novel these days. I wonder why the photocells are not behind the lens and Nipkow disk; the equivalent to modern video camera. It is because the photocells would not be sensitive enough?

     

    As for the receiver, you might want to look into D.B Gardner's "Mirror-Screw" system. It seems to give a brighter and larger image than the Nipkow disk. There are strips of mirrors for each scan line incrementally fixed to the axis of a spinning motor. The signal light source goes through a narrow slit and is reflected by one of the strips of mirror spinning by. This means that the screen size is as wide as the mirror strips and should have a rather wide viewing angle.

     

    The only downside is that I don't have enough information to know if Baird's image encoding can be matched with Gardner's mirror-screw. But it would be interesting to see if it works.

     

    Anyway, here is a pretty interesting site about the different versions of mechanical televisions: http://www.televisionexperimenters.com/Links.html

Comment

  • Baird's process of image capture seems quite novel these days. I wonder why the photocells are not behind the lens and Nipkow disk; the equivalent to modern video camera. It is because the photocells would not be sensitive enough?

     

    As for the receiver, you might want to look into D.B Gardner's "Mirror-Screw" system. It seems to give a brighter and larger image than the Nipkow disk. There are strips of mirrors for each scan line incrementally fixed to the axis of a spinning motor. The signal light source goes through a narrow slit and is reflected by one of the strips of mirror spinning by. This means that the screen size is as wide as the mirror strips and should have a rather wide viewing angle.

     

    The only downside is that I don't have enough information to know if Baird's image encoding can be matched with Gardner's mirror-screw. But it would be interesting to see if it works.

     

    Anyway, here is a pretty interesting site about the different versions of mechanical televisions: http://www.televisionexperimenters.com/Links.html

Children
No Data