Moderators: Dave Moll, Andrew Davie, Steve Anderson
Andrew Davie wrote:I think the best thing to do would be proceed with Baird's original concept -- that is, recording NBTV on a flat phonograph record. My goal would be to have a record that could be played on just about any normal record player -- anything with an electronic output, and use that as the input for the NBTV circuits.
Stephen wrote:It might be possible to record a hill-and-dale groove in the following manner. Take a high power modulated light source, such as an array of LEDs, and focus the modulated light therefrom into a small spot onto the recording surface. The spot of light would obliterate the recording surface under the spot to a depth that varies in accordance with the intensity of the modulated light. This would create a hill-and-dale modulated groove in the recording surface..
Stephen wrote:It would be important to choose a recording medium that is not flammable to avoid the inconvenience of keeping a fire extinguisher on hand. ..
Viewmaster wrote:Thanks for all the considered comments..much appreciated.
In 1877 Thomas Edison invented the phonograph using a cylinder of tin foil. But a short 6 years later in 1883 Paul Nipkow invented the scanning disc.
If these two men had ever met they may well have discussed bringing their ideas together to build a Edikow machine.
That is a bit of history that never was, and I am determined to build such a machine even if the picture is crappy.....as I know it will be.
I bet many NBTV owners would like to see what type of pictures would be possible from an Edikow...I certainly would.
Albert.
ac7zl wrote:I've tossed around the idea of building up a cylinder recorder/player... independent of my NBTV interests, just for the fun of it.
Nostalgia suggests selecting pipe sizes similar in diameter and length to the old Edison cylinders, but I'm thinking that 4" or even 6" diameter cylinders, perhaps even of extended length, would give you all the playing time you'd need.
ac7zl wrote:I've tossed around the idea of building up a cylinder recorder/player... independent of my NBTV interests, just for the fun of it.
Aside from the mechanical issues, there is the question of blank media. Where can you get it?
That is an excellent idea, Klaas. The only issue would be the best way to modulate such a source in an analogue fashion. Is it possible to modulate the drive current for such a semiconductor laser to generate an analogue output?Klaas Robers wrote:It is not so easy to focus the light of several LED's into ONE intensive light spot. Much easier is it to use a semiconductor laser as used in CD-R and/or DVD+RW recorders. Then you have already ONE spot, which is already very small and has an output power of about 150 mW of light.
Is that a usefull idea, or is it too unmechanical?
Users browsing this forum: No registered users and 98 guests