Nixie digital stopwatch repair (DS35)
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- Опубликовано: 11 сен 2024
- Fixing a digital stopwatch (or stopclock) with nixie tubes from the early 1980s made by ZPA Pragotron in Czechoslovakia. Exploring what's inside and how does it work, thermal imaging, explaining the schematic with a 7400 TTL logic, building a replacement for the missing remote control.
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This stopwatch on my website:
danyk.cz/ds35_...
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It's always nice to look at a Nixie clock while counting. In 1977 I have a Nixie digital clock in a discrete design (without IC) with around 150 transistors! built. I'm angry today that I threw them away. Many greetings from the Erzgebirge! Glück Auf!
Beautiful stopwatch, great repair! I'm glad it ended up in your hands and not turned into a clock...
Na video s týmto zariadením som sa veľmi tešil, predpokladal som, že ho niekedy vydáš, keď som v jednom tvojom staršom videu videl tieto stopky spolu s elektrónkovým VF generátorom, kde si tieto prístroje ukázal na konci videa a keď som včera na tvojich českých stránkach našiel článok o týchto stopkách, tak som nadobudol istotu že bude aj video a potešil som sa o to viac. Je to veľmi pekný prístroj s krásnym displejom, digitróny sú podľa mňa najkrajšie zobrazovače a hneď po nich sú fluorescenčné displeje. Ale som si vedomý aj jedného nedostatku tohto prístroja, je totiž taktovaný sieťovou frekvenciou (100 Hz po dvojcestnom usmernení) a sieťová frekvencia kolíše o desatiny percenta, pri hodinách to nevadí, lebo sieťová frekvencia je riadená tak, aby jej stredná hodnota vzhľadom k celému dňu bola čo najbližšie 50 Hz, lenže táto kompenzácia sa u stopiek neuplatní, lebo nebežia celý deň tak ako hodiny a tým pádom bude odchýľka nameranej hodnoty pomerne veľká v porovnaní so skutočnosťou, ale chápem že použili túto koncepciu z ekonomických dôvodov, lebo okrem toho, že by pre vyššiu presnosť museli použiť kryštál, tak by museli byť použité ďalšie deličky (MH7490), pri 100 kHz kryštáli by museli byť použité ďalšie tri kusy MH7490 a to by výslednú konštrukciu predražilo, lebo v tej dobe nebol ani kryštál ani TTL IO zrovna lacná záležitosť, takže toto riešenie do určitej miery chápem. Ďakujem ti za toto veľmi pekné video.
So nice to see nixie tube with a proper '5' digit ! Also, only you would have those hard to find nixie driver chips in your pile of bits - that was fixed easily. It's always amazing to me to see test gear from as late as the '80s still using nixies.
Only few types of soviet nixies with 18mm digits have the 5 made of upside down 2. These are IN-1, IN-4, IN-12A, IN-12B and IN-14. But strangely, IN-8 and IN-8-2 have a good 5, despite also using 18mm digits. Nixie driver chips are hard to find? I have boxes of them :D. Even my milliohm meter from 1989 has nixies it in.
Damn that was a high resolution shot of your cat lol. Cat me off guard
Cats have staff and Dan is happy to slave on for his cat.
Lovely stopwatch, though it's mechanically FUBAR. The C bracket construction makes it very hard to access for servicing. Inice board, and it's very educating to see the thermal camera views.
BTW, I bought a modern DIN 8-pin connector yesterday with my Commodore 64 in mind. Tried plugging it in today and it didn't go despite the good pin layout. The pins turned out to be denser than the original (and probably the old Unitra Eltra DIN connectors would be good here). Maaaaaaaan, was I pissed! Watch out for those new production connectors.
I love that cat 😂😂😂
Nice little gadget.
Neat circuit.
I LOVE this kind of 3D effect in this nixie display.
The way the single digits seems to run from back to Front in a single tube.
Miluju tyhle videa❤
Unless some sort of correction is being made on the grid, AC frequency should be quite accurate so not having a crystal simplifies the device and is a practical solution so long you don't move to a place with different line frequency ;) . This could be a good teaching tool for basic TTL logic.
Yea we used plc’s and wired them to light bulbs to make a street light. We programmed in the logic gates to control times, dwell times and pulsed operation when mains goes out to make one set flash red and opposing set flash yellow. This was my highschool ap maintenance electronic elective final. Used sensors and all like an arduino is used now.. in college getting the engineering in electronic maintenance we had to totally build an entire factory wity logic gates on plc’s then apply that logic to work on circuit boards with components. That was the most enlightening course ever being able to relate various transistors, regulators, bjt’s, oscillators and keeping in mind the matrix of the compound circuits feeding other branches and all..
Yes, correct. However this cannot have 1 millisecond resolution when run from 100Hz clock?
I get nervous when it sounds like a creator has been sick for a while. I hope you're well my Czech friend.
Thank you for your care ;). As far as I know, I'm healthy.
@@DiodeGoneWild I feel honored. This it one of the very few times I see you reply to a comment...So, let's take a look at iiiit.
PS: Great cat shot for this video.
Thanks bro, your videos are educational entertaining.
Let me say this ' DiodegoneCAT' 😂
CatGoneWild
Good job getting it to stop at 1.23.46. So close .
This stop watch didn't come with a wrist band?
The layout looks incredible man
it's nice that you can fix things older than +- 40 years
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je pekný ze dokazes opravit veci starší +- 40 let
Can you do more diy videos pls? Thanks
The cat's comments are always on point 😂
If you replace all the counters and decoders with 74HC chips, the current usage will go way down?
Does the minutes go to 59 properly now?
No, I want to keep it original, not ruin it ;)
The minutes are supposed to go to 99, it's not a failure.
@@DiodeGoneWild >the minutes are supposed to go to 99
just like my microwave
I wonder if it was used to calculate lap times in car races?
You have a lot things from Poland :) Pozdrowienia z Polski :)
Bloody hot one there today mate
Hot fun in the summertime. 32.00 degrees Celsius equals 87.60 degrees Fahrenheit. I wrote a little program to do the conversion for me. It's the communist to freedom program. ~$ c2f 32 I should change the output to say that. 32.00 degrees Communist equals 87.60 degrees Freedom heh
May your salt flow freely.
For a second i thought that remote connector was actually a PS2 Port ;-;
Next project: Convert this into a clock ?
Hell no!!! This has to stay original ;). Most of these already got converted, so an original one is to be appreciated. If I needed another nixie clock, I can just build it, instead of butchering this amazing stopwatch ;).
@@DiodeGoneWild 100% right!!!
@@DiodeGoneWild It would be like converting a cat to a dog. Cats make better youtube mascots. I am getting hardly any subscribers using a cute dog to help me.
Beautiful 👍👍
8:52 This is a war crime. LoL
It would be great if it could be hacked (without destroying it) to count subscribers. For example to send it a pulse every time you get one new subscriber (keeping it in sync).
Rather make a collab with fellow Czech Dalibor Farny and make one with his Nixie tubes. They are one of the last Nixie tube manufacturers in the world!
Just replace the mains ripple with a desired signal. Seems possible
Nice.
What type of thermal camera do you use? Seems it works very well. 🙂
Very nice.👍
Thank you❤❤❤
Nice one 😁👍👍
Heyy Daniel ,, could you please explain to us how 555chip gives us negative voltages, i did not get it, we can by using 555chip make voltage multiplier or Generating a negative voltage using diodes and capacitors ... i did not understand this. thaaaaanks.
Use a temperature controlled soldering gun to save the PCBs.
The soldering gun is his trademark.
The soldering gun is temperature hand controlled! just release the trigger after the solder starts to boil...
He can solder anything PERFECTLY with that iron.
@@1pcfred Eastern Europe: An Antonov plane has 6 seats in the cockpit.
@@LawpickingLocksmith still not good odds that one of the pilots is sober. They should have made it an even dozen.
Is there a clearer/bigger copy of the schematic available?
Unfortunately, I didn't find a better version (if I did, I'd definitely show the better one).
@DiodeGoneWild no worries. Was just curious as I'm planning to use the schematic to build a 60Hz version for north American power.
If I end up doing it, I'll share the schematic. Might even remake the one on your site.
@@devicemodder Well, with 60Hz it won't be so easy to get 100Hz for the 1/100s :)
Nice 🎉
Sir what should be esr value for good ceramic capacitors
A typical ceramic capacitor has very low esr, sometimes below what you can usefully measure with a normal esr meter
ceramics dont go bad esr
Ceramic capacitors tend to have a very low ESR and ESL, but their capacitance tends to be too low to be measured using ESR meters. ESR meters typically use 100kHz and are intended to test electrolytic capacitors. When you try to measure a ceramic capacitor ESR at 100kHz, you're actually measuring its Xc (capacitive reactance).
@@DiodeGoneWild thanks sir
When collab with Dalibor Farny?? 😂
SiC fets and how to drive them pls🙏
No different than Si, but have to watch for excessive dv/dt and probably need bigger gate resistors. Also, a slight negative gate voltage can be beneficial for turning off, but large negative voltages are harmful SiC fets. Si: +20/-20V SiC: +20V/ -4V ...-6V. I definitely wouldn't go lower than -8V. Check datasheet carefully.
I dont know why im here,maybe thats because of your voice
Good ❤❤❤
Can you Make a Video DIY Nixie Tube Clock. Please sir 🙏your Own design.
He should do a collab with Dalibor Farny tbh ;) They live close enough to each other!
He has several designs done already, check his web site.
7805 from highly developed civilisation era.
Youre cat looks very czech
El psy kongroo
Cześć jestem z polski i godziny minuty sekundy is that actually in polish or is it half Polish Half czech?
It's in Czech, but some words are the same in Polish.
You dont sound good?
I have a question at 13:20.
Why we need to use a silicone diode, to get 100Hz timing pulses? Maybe it's because of the smoothing capacitor after this diode? Maybe I'm wrong. It's just the author didn't elaborate on that.
Yes, without the extra diode, you'd have just an almost smooth DC, not the 100Hz pulses.
@@DiodeGoneWild Thank you. Learned a lot(i hope)), from your videos.
Nice