Ward Guitar and Electronic Services
9 September 2020 ·
Mechanical Television Nipkow disc and an Austin Mini car heater motor!

I have recently resurrected the mechanical television I built a few years back . Its a tribute to the genius of John Logie Baird the Father of Television . In 1927 he did some pioneering work establishing the dawn of television broadcast . Using a mechanical camera and receiver he managed to send the first moving electronic pictures . The system was based on the Nipkow disc . I had the benefit of modern electronics and test equipment at my disposal, oh yes and a laser cutter .. I also knew it should work and was well documented . None of this made it any easier and I spent several weeks working sometimes day and night to make the project run . There is very informative page on the BBC website about J.L.B which may be of interest to anybody who has time to read .
Did I mention it runs on an old Austin Mini heater motor....

The main component of the televisor is the Nipkow disc. Invented by Paul Julius Gottlieb Nipkow in 1883. The Nipkow disc is simply a solid disc with a spiral of holes around the outside. As the holes pass in front of a modulated light source it allows the light to pass through along one each of the picture. The modulated light source in the televisors of the 1920s was a neon tube, driven by a valve amplifier. My device uses 4 ultra bright 1 watt leds modulated by a Mosfet driver . The signal source is now a stereo wav file . I have sound on the right channel and vision on the left
ok so for the technical minded here are some specs.
32 lines 12.5 frames per second The sync pulse is 400Hz negative going
That means my 600mm the disc is rotating at precisely 750rpm

Here is a nice history of television and John Logie Baird on the BBC
copy and paste the link below into your internet browser. I could find no way of making a hyperlink in youtube text editor.
[ Ссылка ]

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