Vintage Display Technology Pt.4: Oscilloscope Clocks

[@konohh]

I also build a Scope Clock with the same Kit. I've decided to go for a blue/greenish Telefunken DN10-14 Tube, but nevertheless It's really a beauty and a great eyecatcher in the living room. Great Projekt! (Mine here: kzbin.info/www/bejne/a53Ue5SAedR8q7M )

[@datasilouk1995]

That's so wonderfully sharp.

[@thecatofnineswords]

Lovely lovely use of old tech!

[@vu2abs]

I have a similar 130 C1 P7 blue long persistence tube. Hope make a similar clock soon.

[@NicleT]

Fantastic project. Thank you so much for sharing.

[@12voltvids]

That would be the 2nd anode over here on this side of the pond.

[@ikonix360]

Believe that CRT uses P2 phosphor which explains the slight afterglow.

[@vu2abs]

After acceleration terminal = Post deflection Anode

[@KainkaLabs]

Thanks for clarification

[@robertcoulthard7461]

I think the term for the high voltage return in English is referred to as the fly back

[@KainkaLabs]

Looked it up: It´s the "post-deflection acceleration-voltage". It´s a DC-voltage in the range of a few 1000 volts. (The flyback-transformer used in CRTs for TV is for the magnetic deflection not for acceleration AFAIK.)

[@robertcoulthard7461]

KainkaLabs thanks. I really like you videos

[@Jeffrey314159]

I always thought that the Flyback Transformer was for generating extremely high voltages. The last tube to be replaced in TV's (other than the CRT) was a high voltage rectifyer vacuum diode tube connected to the flyback xformer

[@MarkTillotson]

flyback transformer is for TV scanning only where the horizontal scan is a fixed frequency - its basically a hack to combine PSU and scanning oscillator into a single circuit for lower cost. Scope's have to support any scan speed so that the X and Y deflection circuits are basically just linear amplifiers. For an electrostatically deflected beam tube you want a slow electron beam to make deflection easier, but then want to increase its speed/energy to make the screen bright. Magnetic deflection is used in TV tubes so they don't have to be 4+ foot long.

[@patrickradcliffe3837]

Aren't you worried about burn in with dial and numbers?

[@KainkaLabs]

No. There is an algorithm that shifts the display for a few millimeters from time to time. I have the CRT running at low brightness and I think that these tubes were made to have a long life because they were running in radar-stations 24/7.

[@SianaGearz]

This is so ace! Maybe something like an early 4-bit microcontroller would be more authentic, or in a pinch a Z80 or 6502, but if we were to discuss terrible ideas... all a watch face is, at the end of the day, is a collection of static shapes that get swapped in and out, basically you have one shape collection for the backdrop and scale, one you've got on a counter as a minute hand, one as hour hand, optionally more hands and icons... Assuming you're building like the classic mains cycle counter watch, you shouldn't need a processor, some ROMs and shift registers should suffice. Terribly wasteful idea, i know.

[@konohh]

Combining a vintage Scope Clock with a "vintage" CPU (Z80 6502 etc,) is a great idea, but the used "modern" microcontrolers are just barely achieving the needed framerate to make it flicker free. I seriously doubt that a vintage CPU would be fast enough.

[@stevedoubleu99B]

Coooooooooooool clock!

[@grzesiekxitami3264]

An astonishing old calculator - Numberphile @ KZbin