First Televisor build (15" stainless steel disc)

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First Televisor build (15" stainless steel disc)

Postby sebket » Sun Feb 17, 2019 10:03 pm

Hello everybody,

as promised, here's the seperate thread about the construction of my first Televisor using the club's 15 inch stainless steel Nipkow disc.

I constructed the LED/sync and motor circuit as they're described in the handbook, the only difference being that I replaced two resistors on the motor PCB with a potentiometer in order to control the amout of PLL control over the RPM according to a hint I got from Klaas. I've also omited the 10 Ohm resistor in the motor's positive lead.

The LED matrix consists of 8 ultra-bright white LEDs, each with their own resistor.
In order to get an even illumination, some distance was needed between the LEDs and the diffusor (two layers of the club's diffuser film). To achieve this, I constructed a roll from thick cardboard to use it as a "light tunnel".

The motor used is an industrial quality pancake (or disc) motor. Luckily, the shaft of the motor measures exactly 6mm, just like the center hole of the disc. To fix the disc to the motor, I took an old toothed wheel that has a 6mm bore as well and can be fixed to the shaft with two grub screws. That wheel, I glued to the Nipkow disc with some industrial grade polymer glue. The glueing power of that stuff is crazy. I ran the TV for about an hour since it was constructed and so far, the disc stays in place. As the motor shaft goes through the toothed wheel and the Nipkow disc, the radial forces while spinning are taken by the shaft and not the glue.

The rest of the device is constructed mainly from MDF and various bits and pieces I had laying around in the workshop.
The audio amplifier is a cheap kit I once bought for a few Euros which drives a tiny speaker.

I tried to capture the process in a few pictures as good as possible.
Please see the photos attached, each with a short description.
If you have any questions, suggestions, please let me know.

Please note that the case is still in the early stage and will look a lot nicer in the end (hopefully) :D
Attachments
IMG_20190208_171608.jpg
The motor.
IMG_20190125_185200.jpg
Front view: motor in the middle, viewing area on the right, IR sensor will be on the left.
IMG_20190125_185320.jpg
Toothed wheel glued to the disc.
IMG_20190126_103437.jpg
Even illumination.
IMG_20190126_103458.jpg
Light tunnel and motor installed.
IMG_20190126_202447.jpg
IR sensor attached.
IMG_20190127_122951.jpg
Test run. Notice the aluminum arm on the left carrying the IR LED.
IMG_20190205_190831.jpg
It works!!!
IMG_20190205_190831.jpg (79.21 KiB) Viewed 1174 times
IMG_20190208_180613.jpg
Arranging and fixing the components.
IMG_20190215_133504.jpg
Control assembly.
IMG_20190216_101915.jpg
Everything installed in the cabinet, cables tied together.
IMG_20190216_101928.jpg
Detail 1: PCB for LED and motor can be seen.
IMG_20190216_101935.jpg
Detail 2: audio amplifier and speaker can be seen.
IMG_20190216_101951.jpg
Front view.
IMG_20190216_101959.jpg
Controls.
IMG_20190216_102012.jpg
Provisoric viewing tunnel made from sandpaper and a magnifying glass.
Last edited by sebket on Mon Feb 18, 2019 7:53 pm, edited 1 time in total.
Best wishes,
Sebastian
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sebket
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Re: First Televisor build (15" stainless steel disc)

Postby acl » Sun Feb 17, 2019 10:46 pm

Looking Good Sebastian,

I was a little worried about the exposed disc at first but you have housed it nicely and it looks good. I myself use the switch mode power supplies from China as these are relatively cheap to buy.

Anyway Best wishes and on with your next project.

Chris Lewis
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Re: First Televisor build (15" stainless steel disc)

Postby Robonz » Mon Feb 18, 2019 3:52 pm

I have to say that disc is spot on. That's one of the best pictures I have seen. The edge of the frame is so straight. The lines have a near perfect spacing. Well done. I would have been tempted to leave the disc more visible as it is such a thing of beauty.

Cheers
Keith
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Re: First Televisor build (15" stainless steel disc)

Postby sebket » Mon Feb 18, 2019 8:09 pm

Keith,
I can not take credit for the disc as it is the laser cut stainles steel disc from the club shop. But I agree with you, the quality of the disc and thus the resulting image is indeed superb.
And a thing of beauty it is too, that's true as well. But I agree with Chris here, a thin large metal disc spinning with 750 rpm can be quite dangerous :shock:

The next project is going to be a disc based camera. The electronic components are already waiting in the workshop. I will keep you updated.
Best wishes,
Sebastian
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Re: First Televisor build (15" stainless steel disc)

Postby Robonz » Mon Feb 18, 2019 8:14 pm

I was thinking more along the lines of having a large acrylic window or the likes on the box so you can see it in action and be safe at the same time. I guess my disc being 6mm thick acrylic makes it very safe to run fully open.

A camera sounds great, I am looking forward to seeing your progress, We made some great headway on my dual mirror drum TV this week. Like all projects, they take a lot of time and effort.
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